Bank Subsidiary [Abstract] Bank Subsidiary [Abstract] Bank segment Bank Subsidiary [Text Block] This element encapsulates disclosures pertaining to banking subsidiary. Leases [Abstract] Leases Lessee, Operating Leases [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Fair value of property or collateral Fair Value of Property or Collateral [Member] Represents the fair value of property or collateral valuation technique used to measure fair value. Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Home equity line of credit Home Equity Line of Credit [Member] Residential land Residential Land Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to residential land receivables. Real estate acquired in settlement of loans Real Estate Acquired in Settlement of Loans [Member] Represents the portfolio segment of the entity's total financing receivables related to real estate acquired in settlement of loans financing receivables. Fair value measurements Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair value Assets, Fair Value Disclosure Appraised value, selling cost Fair Value Assumptions, Selling Cost, Percent Fair Value Assumptions, Selling Cost, Percent Statement of Comprehensive Income [Abstract] Net unrealized gains (losses) on securities arising during the period, (taxes) benefits Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Hawaiian Electric Company, Inc. and Subsidiaries Hawaiian Electric Company and Subsidiaries [Member] Represents Hawaiian Electric Company, Inc, and Subsidiaries. Statement [Line Items] Statement [Line Items] Unrealized interest rate hedging losses arising during period, tax benefits Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax expense Other Comprehensive Income, Reclassification Adjustment for Impact of Decision and Orders of the P U C Included in Regulatory Assets, Tax The amount of income taxes on the reclassification adjustments on pension and post retirement benefits for the accounting impact of the decisions issued by the Public Utilities Commission. Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] AOCI AOCI Attributable to Parent [Member] Net unrealized gains (losses) on securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Unrealized gains (losses) on derivatives AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] Retirement benefit plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] AOCI Attributable to Parent, Net of Tax [Roll Forward] Beginning Balance Stockholders' Equity Attributable to Parent Current period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Ending Balance Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Receivable, Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Residential 1-4 family Residential 1 to 4 Family Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to residential 1-4 family financing receivables. Commercial real estate Commercial Real Estate Portfolio Segment [Member] Commercial construction Construction Loans [Member] Residential construction Residential Construction Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to residential construction. Commercial loans Commercial Loan [Member] Consumer loans Consumer Loan [Member] Carrying amount and the total unpaid principal balance of impaired loans, with and without recorded allowance for loans losses Financing Receivable, Impaired [Line Items] Recorded investment: Impaired Financing Receivable, Recorded Investment [Abstract] With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment With an allowance recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Recorded investment Impaired Financing Receivable, Recorded Investment Unpaid principal balance: Impaired Financing Receivable, Unpaid Principal Balance [Abstract] With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance With an allowance recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Unpaid principal balance Impaired Financing Receivable, Unpaid Principal Balance Related Allowance Impaired Financing Receivable, Related Allowance Average recorded investment: Impaired Financing Receivable, Average Recorded Investment [Abstract] With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment With an allowance recorded Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Average recorded investment Impaired Financing Receivable, Average Recorded Investment Interest income recognized: Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method With an allowance recorded Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Interest income recognized Impaired Financing Receivable, Interest Income, Accrual Method Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension benefits Pension Plan [Member] Other benefits Other Postretirement Benefits Plan [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Hawaiian Electric Industries, Inc. Parent Company [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] American Savings Bank (ASB) American Savings Bank FSB [Member] American Savings Bank FSB Retirement benefits Defined Benefit Plan Disclosure [Line Items] Defined benefit plans Defined Benefit Plan [Abstract] Contributions made to defined benefit plans Defined Benefit Plan, Plan Assets, Contributions by Employer Contributions expected to be paid in current year Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Expected payments for remainder of fiscal year Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of net prior service gain Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of net actuarial (gains) losses Defined Benefit Plan, Amortization of Gain (Loss) Net periodic pension/benefit cost (return) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Impact of PUC D&Os Defined Benefit Plan, Impact of Public Utilities Commission Decisions and Orders Represents the impact of Public Utilities Commission's decisions and orders on net periodic benefit cost. Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) Defined Benefit Plan, Net Periodic Benefit Cost Adjusted for Impact of Public Utilities Commission Decisions and Orders Represents the total amount of net periodic benefit cost adjusted for impact of Public Utilities Commission's decisions and orders. Retirement benefits expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case (in years) Defined Benefit Plan, Number of Years Regulatory Assets or Liability will be Amortized for Each Utility which Start from Respective Utilities Next Rate Case Represents the number of years for which regulatory asset/liability for each utilities will be amortized, beginning with the respective utility's next rate case. Defined contribution plan, expenses recognized Defined Contribution Plan, Cost Cash contributions by the employer to defined contribution plan Defined Contribution Plan, Contributions by Employer Represents the contributions made by the employer in defined contribution plan. Electric utility subsidiary [Abstract] Electric utility subsidiary [Abstract] Condensed Statement of Comprehensive Income [Table] Condensed Statement of Comprehensive Income [Table] Hawaiian Electric (parent only) Hawaiian Electric, Parent [Member] Hawaiian Electric, Parent [Member] HELCO Hawaii Electric Light Company, Inc [Member] Hawaii Electric Light Company, Inc [Member] Maui Electric Maui Electric Company Limited [Member] Maui Electric Company Limited [Member] Other subsidiaries Renewable Hawaii and Uluwehiokama Biofuels Company [Member] Represents the information pertaining to Renewable Hawaii company, a wholly owned subsidiary of the entity. It also represents the information pertaining to Uluwehiokama Biofuels company, a non-regulated subsidiary of the entity. Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Legal Entities Reportable Legal Entities [Member] Consolidating adjustments Eliminations And Reconciling Items [Member] Represents the aggregate total of reconciling items and elimination items Condensed Statement of Income Captions [Line Items] Condensed Statement of Income Captions [Line Items] Net income for common stock Net Income (Loss) Available to Common Stockholders, Basic Other comprehensive income (loss), net of taxes: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Retirement benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent [Abstract] Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits Other Comprehensive Income, Reclassification of Defined Benefit Plans Net Gain (Loss), Prior Service Gain (Loss), and Net Transition Asset Obligation Recognized in Net Periodic Benefit Cost, Net of Tax The adjustment out of other comprehensive income for actuarial gains or losses, prior service gains or losses, and net transition asset or obligation recognized as a component of net periodic benefit cost during the period, after tax. Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes Other Comprehensive Income, Reclassification Adjustment for Impact of Decision and Orders of the P U C Included in Regulatory Assets, Net of Tax Reclassification adjustments on pension and post retirement benefits for the accounting impact of the decisions issued by the Public Utilities Commission, net of income taxes. Other comprehensive income (loss), net of taxes Comprehensive income attributable to Hawaiian Electric Industries, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Interest and dividend income Interest and Dividend Income, Operating Total noninterest income Noninterest Income Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Total interest expense Interest Expense Provision for loan losses Provision for Loan Losses Expensed Noninterest expense Noninterest Expense Less: Retirement defined benefits gain (expense)—other than service costs Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Total expenses Costs and Expenses Operating income Operating Income (Loss) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Schedule of Condensed Financial Statements [Table] Condensed Financial Statements [Table] Statements of Equity Condensed Financial Statements, Captions [Line Items] Increase (decrease) in stockholders' equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Net income for common stock Other comprehensive income, net of taxes Common stock dividends Dividends, Common Stock, Cash Common stock issuance expenses Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] LTIP linked to TRS Long-term Incentive Plan Linked to Total Return to Shareholders [Member] Represents Long-term incentive plan (LTIP) as awarded by a company to their employees based on total return to shareholders (TRS). Fair Value Measurement Inputs and Valuation Techniques [Line Items] Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Range of expected volatility for Peer Group, minimum rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Range of expected volatility for Peer Group, maximum rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Grant Date Fair Value Represents the estimated fair value at grant date for nonvested equity-based awards on other than stock (or unit) option plans. Income Tax Disclosure [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Effective income tax, percent Effective Income Tax Rate Reconciliation, Percent Federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Unsecured Notes Unsecured Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Series 2019A Note Purchase Agreement, Series 2019A [Member] Note Purchase Agreement, Series 2019A [Member] 2004 Junior subordinated deferrable interest debentures redeemed Junior Subordinated Deferrable Interest Debentures Redeemed 2004 [Member] Junior Subordinated Deferrable Interest Debentures Redeemed 2004 [Member] Refunding Series 2019 Special Purpose Revenue Bonds Refunding Series 2019 Special Purpose Revenue Bonds [Member] Refunding Series 2019 Special Purpose Revenue Bonds [Member] Series 2009 Special Purpose Revenue Bonds Redeemed Series 2009 Special Purpose Revenue Bonds Redeemed [Member] Series 2009 Special Purpose Revenue Bonds Redeemed [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate principal amount Long-term Debt, Gross Fixed coupon interest rate Debt Instrument, Interest Rate, Stated Percentage Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Electric utility Electric Utility Segment [Member] Represents information about the electric utility business segment of the company. Certain subsidiaries of the company are regulated operating public utilities engaged in the production, purchase, transmission, distribution and sale of electricity. Bank Banking Segment [Member] Represents information about the banking business segment of the company. Other Other Segments [Member] Revenues from external customers Operating Segments [Member] Intersegment revenues (eliminations) Intersegment Eliminations [Member] Segment financial information Segment Reporting Information [Line Items] Total revenues Income (loss) before income taxes Income taxes (benefit) Income Tax Expense (Benefit) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Preferred stock dividends of subsidiaries Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable Net income for common stock Total assets Assets Regulatory Projects and Legal Obligations [Table] Regulatory Projects and Legal Obligations [Table] Discloses the components of regulatory projects and legal obligations. Major Vendor [Axis] Major Vendor [Axis] Vendor that is considered major by the entity. Major Vendor [Domain] Major Vendor [Domain] Name and description of the vendor that account for major purchases of the entity. Kalaeloa Kalaeloa Partners L P [Member] Represents an independent power producer (IPP) with whom the entity has entered into a power purchase agreement. Hawaii Electric Light Company, Inc. (HELCO) Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] AES Hawaii AES Hawaiian Inc [Member] Represents an independent power producer (IPP) with whom the entity has entered into a power purchase agreement. Hu Honua Bioenergy, LLC Hu Honua Bioenergy, LLC [Member] Hu Honua Bioenergy, LLC [Member] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] PCB Contamination PCB Contamination [Member] PCB Contamination [Member] Regulatory Projects and Legal Obligations [Line Items] Regulatory Projects and Legal Obligations [Line Items] -- None. No documentation exists for this element. -- Increased power purchase commitment capacity (in megawatts) Aggregate of Power Purchase Capacity Increases from Initial Capacity Aggregate of Power Purchase Capacity Increases from Initial Capacity Purchase commitment, period (in years) Long-term Purchase Commitment, Period Minimum power volume required (in megawatts) Long-term Purchase Commitment, Minimum Power Volume Required Long-term Purchase Commitment, Minimum Power Volume Required Additional capacity requirement (in megawatts) Long Term Purchase Commitment, Arbitration, Additional Capacity Requirement Long Term Purchase Commitment, Arbitration, Additional Capacity Requirement AFUDC rate Public Utilities, Allowance for Funds Used During Construction, Rate Project costs, accrued carrying costs once put into service Public Utilities, ERP/EAM Implementation Project Costs, Accrued Carrying Costs Once Put Into Service Public Utilities, ERP/EAM Implementation Project Costs, Accrued Carrying Costs Once Put Into Service Future O&M expense reductions Public Utility, ERP/EAM System, Future Operation And Maintenance Expense Reductions Public Utility, ERP/EAM System, Future Operation And Maintenance Expense Reductions Future cost avoidance related to capital cost and tax costs Public Utility, ERP/EAM System, Future Cost Avoidance Related To Capital Cost And Tax Cost Public Utility, ERP/EAM System, Future Cost Avoidance Related To Capital Cost And Tax Cost ERP/EAM project service period (in years) Public Utility, ERP/EAM Project Service Period Public Utility, ERP/EAM Project Service Period Regulatory liability for O&M expense reductions Public Utility, ERP/EAM Regulatory Liability For Operation And Maintenance Expense Reductions Public Utility, ERP/EAM Regulatory Liability For Operation And Maintenance Expense Reductions West Lock PV Project, energy generated (in megawatts) Public Utilities, Solar Project, Facility Energy Production Public Utilities, Solar Project, Facility Energy Production West Lock PV Project, cost cap Public Utilities, Solar Project, Project Cap Public Utilities, Solar Project, Project Cap West Lock PV Project, maximum energy cost (in dollars per kilowatt hours) Public Utilities, Solar Project, Maximum Energy Cost Public Utilities, Solar Project, Maximum Energy Cost West Lock PV Project, project costs incurred Public Utilities, Solar Project, Cost Incurred Public Utilities, Solar Project, Cost Incurred Environmental regulation Environmental Remediation Obligations [Abstract] Additional accrued investigation and estimated cleanup costs Reserve for Additional Investigation and Estimated Clean up Costs Represents the amount of additional accrued investigation and estimated cleanup costs. Valuation allowances and reserves Accrual for Environmental Loss Contingencies Segment financial information Segment Reporting Disclosure [Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Number of contracts Financing Receivable, Troubled Debt Restructuring, Contracts That Subsequently Defaulted, Number Financing Receivable, Troubled Debt Restructuring, Contracts That Subsequently Defaulted, Number Recorded investment Financing Receivable, Troubled Debt Restructuring, Contract That Subsequently Defaulted, Value Financing Receivable, Troubled Debt Restructuring, Contract That Subsequently Defaulted, Value Statement of Stockholders' Equity [Abstract] Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Electric utility segment [Abstract] Electric utility segment [Abstract] HPOWER Hpower [Member] Represents an independent power producer (IPP) with whom the entity has entered into a power purchase agreement. Puna Geothermal Venture Puna Geothermal Venture [Member] Puna Geothermal Venture [Member] Hamakua Energy Hamakua Energy Partners L P [Member] Represents an independent power producer (IPP) with whom the entity has entered into a power purchase agreement. Wind IPPs Wind Independent Power Producers [Member] Wind Independent Power Producers [Member] Solar IPPs Solar Independent Power Producer [Member] Solar Independent Power Producer [Member] Other IPPs Other Independent Power Producers [Member] Represents information pertaining to other independent power producers. Purchased power Utilities Operating Expense, Purchased Power Revenue from Contract with Customer [Abstract] Disaggregation of revenue Disaggregation of Revenue [Table Text Block] Income Statement [Abstract] Revenues Revenues [Abstract] Total revenues Expenses Costs and Expenses [Abstract] Fuel oil Utilities Operating Expense, Fuel Used Other operation and maintenance Utilities Operating Expense, Maintenance and Operations Depreciation Utilities Operating Expense, Depreciation and Amortization Taxes, other than income taxes Utilities Operating Expense Other Taxes Discloses the amount of operating expense for the period related to taxes other than income taxes. Operating income (loss) Operating Income (Loss) [Abstract] Total operating income Retirement defined benefits expense—other than service costs Interest expense, net—other than on deposit liabilities and other bank borrowings Interest Expense on Other than Deposits and Bank Borrowings The amount of interest expense, other than on deposit liabilities and other bank borrowings. Allowance for borrowed funds used during construction Interest Costs Capitalized Adjustment Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Interest expense and other charges, net Interest Expense and Other Charges Interest expense and other charges during the period. Income before income taxes Income taxes Net income attributable to Hawaiian Electric Net Income (Loss) Attributable to Parent Preferred stock dividends of Hawaiian Electric Preferred Stock Dividends, Income Statement Impact Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Weighted-average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Net effect of potentially dilutive shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average shares assuming dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Balance Sheets Data Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest-bearing deposits Interest-bearing Deposits in Banks and Other Financial Institutions Available-for-sale investment securities, at fair value Debt Securities, Trading, and Equity Securities, FV-NI Held-to-maturity investment securities, at amortized cost Debt Securities, Held-to-maturity Stock in Federal Home Loan Bank, at cost Federal Home Loan Bank Stock Loans held for investment Loans and Leases Receivable, Net of Deferred Income Allowance for loan losses Loans and Leases Receivable, Allowance Net loans Loans and Leases Receivable, Net Amount Loans held for sale, at lower of cost or fair value Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Other Other Assets Goodwill Goodwill Total assets Liabilities and shareholder’s equity Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Deposit liabilities—noninterest-bearing Noninterest-bearing Deposit Liabilities Deposit liabilities—interest-bearing Interest-bearing Deposit Liabilities Other borrowings Other Borrowings Other Other Liabilities Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss, net of tax benefits Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized losses on securities Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax Retirement benefit plans Accumulated Other Comprehensive Income (Loss) Defined Benefit Pension and Other Postretirement Plans Net of Tax Adjusted for Regulatory Impacts The total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. This amount is adjusted for regulatory rate making impacts. Accumulated other comprehensive loss, net of tax benefits Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Total liabilities and shareholders’ equity Liabilities and Equity Other assets Other Assets [Abstract] Bank-owned life insurance Bank Owned Life Insurance Premises and equipment, net Property, Plant and Equipment, Net Accrued interest receivable Interest Receivable Mortgage-servicing rights Servicing Asset at Amortized Cost Low-income housing equity investments Equity Investments, Affordable Housing Program Equity Investments, Affordable Housing Program Real estate acquired in settlement of loans, net Real Estate Acquired Through Foreclosure Real estate held for sale Real Estate Held-for-sale Other Other Assets, Miscellaneous Other liabilities Other Liabilities [Abstract] Accrued expenses Accrued Liabilities Federal and state income taxes payable Accrued Income Taxes Cashier’s checks Cashier Checks Cashier's check is a check drawn directly on a customer's account, making the bank the primary obligor, and assuring firm that the amount will be paid. Advance payments by borrowers Advance Payments by Borrowers for Taxes and Insurance Other Other Sundry Liabilities Total other liabilities Balance Sheet related disclosures Balance Sheet Related Disclosures [Abstract] Held-to-maturity investment securities Debt Securities, Held-to-maturity, Fair Value Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase Advances from Federal Home Loan Bank Advances from Federal Home Loan Banks Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair value measurements on a nonrecurring basis Fair Value, Measurements, Nonrecurring [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Estimated fair value Estimate of Fair Value Measurement [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Fair value measurements on a recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Loans, net Loans Receivable, Fair Value Disclosure Real estate acquired in settlement of loans Adjustments to fair value of loans held for sale Loans Receivable Held for Sale Amount Fair Value Adjustments Represents the amount of fair value adjustments in loans held for sale. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Common stock Common Stock [Member] Share-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Income tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Amortized cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Available-for-sale Securities, Debt Maturities [Abstract] Available-for-sale Securities, Debt Maturities [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Due after ten years Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost Total amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Amortized cost Debt Securities, Available-for-sale, Amortized Cost Held-to-Maturity, Debt Securities, Amortized Cost [Abstract] Held-to-Maturity, Debt Securities, Amortized Cost [Abstract] Held-to-Maturity, Debt Securities, Amortized Cost [Abstract] Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost Amortized cost Fair value Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Available-for-sale Securities, Debt Securities, Fair Value [Abstract] Available-for-sale Securities, Debt Securities, Fair Value [Abstract] Available-for-sale Securities, Debt Securities, Fair Value [Abstract] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Total fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Total available-for-sale securities Debt Securities, Available-for-sale Held-to-maturity Securities, Debt Securities, Fair Value [Abstract] Held-to-maturity Securities, Debt Securities, Fair Value [Abstract] Held-to-maturity Securities, Debt Securities, Fair Value [Abstract] Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value Total held-to-maturity securities Schedule of estimated fair values of certain of the Company's financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of assets measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of assets measured at fair value on a nonrecurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of significant unobservable inputs used in the fair value measurement Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Bank subsidiary -- None. No documentation exists for this element. -- Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Commercial Portfolio Segment Commercial Portfolio Segment [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass Pass [Member] Special mention Special Mention [Member] Substandard Substandard [Member] Doubtful Doubtful [Member] Loss Unlikely to be Collected Financing Receivable [Member] Credit risk profile by internally assigned grade for loans Financing Receivable, Recorded Investment [Line Items] Loans and leases receivable before fees, gross Financing Receivable, Net Lease, Cost Lease, Cost [Table Text Block] Schedule of Annual Undiscounted Cash Flows on Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases Under 842 Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Retirement benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Residential loan Residential Mortgage [Member] Servicing contracts Servicing Contracts [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Note rate Measurement Input, Note Interest Rate [Member] Measurement Input, Note Interest Rate [Member] Discount rate Measurement Input, Discount Rate [Member] Prepayment speed Measurement Input, Prepayment Rate [Member] Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Amortized Cost [Line Items] Proceeds from sale of mortgage loans Proceeds from Sale of Mortgage Loans Held-for-sale Gain on sale of mortgage loans Gain (Loss) on Sale of Mortgage Loans Repurchase reserve Mortgage Loans on Real Estate, Repurchase Reserve Mortgage Loans on Real Estate, Repurchase Reserve Mortgage service fees Fees and Commissions, Mortgage Banking and Servicing Gross carrying amount Servicing Asset Accumulated amortization Servicing Asset, Accumulated Amortization Servicing Asset, Accumulated Amortization Valuation allowance Valuation Allowance for Impairment of Recognized Servicing Assets, Balance Net carrying amount Servicing Asset, Net Servicing Asset, Net SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] Servicing asset - beginning balance Amount capitalized Servicing Asset at Amortized Value, Amount Capitalized Servicing Asset at Amortized Value, Amount Capitalized Amortization Servicing Asset at Amortized Cost, Amortization Other-than-temporary impairment Servicing Asset at Amortized Cost, Other than Temporary Impairments Servicing asset - ending balance Valuation Allowance [Roll Forward] Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward] Valuation allowance, beginning balance Provision (recovery) Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries) Valuation allowance, ending balance Unpaid principal balance Fair Value Inputs, Unpaid Principal Balance, Asset Fair Value Inputs, Unpaid Principal Balance, Asset Weighted average measurement input Servicing Asset, Measurement Input Prepayment rate: Fair Value Inputs, Prepayment Rate [Abstract] Fair Value Inputs, Prepayment Rate [Abstract] 25 basis points adverse rate change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Point Adverse Change in Prepayment Speed The hypothetical financial impact of a 25 basis point adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. 50 basis points adverse rate change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Point Adverse Change in Prepayment Speed Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Point Adverse Change in Prepayment Speed Discount rate: Fair Value Inputs, Discount Rate [Abstract] Fair Value Inputs, Discount Rate [Abstract] 25 basis points adverse rate change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Points Adverse Change in Discount Rate Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Points Adverse Change in Discount Rate 50 basis points adverse rate change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Points Adverse Change in Discount Rate Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Points Adverse Change in Discount Rate Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Schedule of segment financial information Schedule of Segment Reporting Information, by Segment [Table Text Block] Shareholders' equity Stockholders' Equity Note Disclosure [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Unfunded commitments to fund the company's LIHTC Qualified Affordable Housing Project Investments, Commitment Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Other leases Other Operating Leases [Member] Other Operating Leases [Member] PPAs classified as leases Power Purchase Agreements Qualifying As Operating Leases [Member] Power Purchase Agreements Qualifying As Operating Leases [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Renewal option range Lessee, Operating Lease, Renewal Term Operating lease cost Operating Lease, Cost Variable lease cost Variable Lease, Cost Total lease cost Lease, Cost Other information Lease, Cost [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Income and Expenses, Lessee [Abstract] Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases Operating Lease, Payments Weighted-average remaining lease term—operating leases (in years) Operating Lease, Weighted Average Remaining Lease Term Weighted-average discount rate—operating leases Operating Lease, Weighted Average Discount Rate, Percent Operating Lease Liabilities, Payments Due [Abstract] Operating Lease Liabilities, Payments Due [Abstract] 2019 (remaining months) Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five 2024 Lessee, Operating Lease, Liability, Payments, Due Year Six Lessee, Operating Lease, Liability, Payments, Due Year Six Thereafter Lessee, Operating Lease, Liability, Payments, Due After Year Six Lessee, Operating Lease, Liability, Payments, Due After Year Six Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Operating lease liabilities Operating Lease, Liability Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2019 Operating Leases, Future Minimum Payments, Remainder of Fiscal Year 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total lease payments Operating Leases, Future Minimum Payments Due Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Real Estate Segment [Member] Real Estate Segment [Member] Real Estate Segment [Member] Commercial Segment [Member] Commercial Segment [Member] Commercial Segment [Member] Consumer Segment [Member] Consumer Segment [Member] Consumer Segment [Member] Real estate loans Real Estate Loan [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Loans receivable Loans and Leases Receivable, Gross Less: Deferred fees and discounts Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required Minimum Benchmark Percentage of Loan to Appraisal Ratio which Mortgage Insurance is Required Represents the minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required as per the policy of the reporting entity. 2019 Annual incremental RAM adjusted revenues Public Utility, Annual Incremental Rate Adjustment Mechanism Adjusted Revenue Public Utility, Annual Incremental Rate Adjustment Mechanism Adjusted Revenue Annual change in accrued RBA balance as of December 31, 2018 (and associated revenue taxes) which incorporates MPIR recovery Public Utility, Increase (Decrease) In Accrued Earnings Sharing Credits To Be Refunded Public Utility, Increase (Decrease) In Accrued Earnings Sharing Credits To Be Refunded Performance Incentive Mechanisms (net) Public Utilities, Decoupling Filing, Performance Incentive Mechanism Public Utilities, Decoupling Filing, Performance Incentive Mechanism Net annual incremental amount to be collected (refunded) under the tariffs Public Utility, Net Receivable Under Tariff Public Utility, Net Receivable Under Tariff 2017 Tax Act Adjustment Public Utilities, Decoupling Filing, Tax Cuts And Jobs Act, Change In Tax Rate, Income Tax Expense (Benefit) Public Utilities, Decoupling Filing, Tax Cuts And Jobs Act, Change In Tax Rate, Income Tax Expense (Benefit) MPIR requested amount Public Utilities, Solar Project, Major Project Interim Recovery Requested Amount Public Utilities, Solar Project, Major Project Interim Recovery Requested Amount Decoupling order, service reliability performance, historical measurement period (in years) Public Utility, Decoupling Order, Performance Incentive Mechanism, Service Reliability, Target Performance Historical Measurement Period Public Utility, Decoupling Order, Performance Incentive Mechanism, Service Reliability, Target Performance Historical Measurement Period Maximum penalty, percent of ROE Public Utility, Decoupling Order, Performance Incentive Mechanism, Service Reliability, Maximum Penalty, Percent Of Return On Equity Public Utility, Decoupling Order, Performance Incentive Mechanism, Service Reliability, Maximum Penalty, Percent Of Return On Equity Service reliability, pending adjusted maximum penalty amount Public Utility, Decoupling Order, Performance Incentive Mechanism, Service Reliability, Maximum Penalty, Pending Adjusted Amount Public Utility, Decoupling Order, Performance Incentive Mechanism, Service Reliability, Maximum Penalty, Pending Adjusted Amount Dead band percentage above or below the target Public Utility, Decoupling Order, Performance Incentive Mechanism, Call Center Performance, Dead Band Percentage Above Or Below Target Public Utility, Decoupling Order, Performance Incentive Mechanism, Call Center Performance, Dead Band Percentage Above Or Below Target Call center performance, maximum penalty percentage Public Utility, Decoupling Order, Call Center Performance, Maximum Penalty, Percent Public Utility, Decoupling Order, Call Center Performance, Maximum Penalty, Percent Call center performance, pending adjusted maximum penalty Public Utility, Decoupling Order, Call Center Performance, Maximum Penalty, Pending Adjusted Amount Public Utility, Decoupling Order, Call Center Performance, Maximum Penalty, Pending Adjusted Amount Call center performance, maximum penalty amount Public Utility, Decoupling Order, Call Center Performance, Maximum Penalty, Amount Public Utility, Decoupling Order, Call Center Performance, Maximum Penalty, Amount Call center, additional penalty accrued Public Utility, Decoupling Order, Call Center Performance, Additional Penalty Accrued Public Utility, Decoupling Order, Call Center Performance, Additional Penalty Accrued Energy price, renewable projects with storage capacity (in dollars per kilowatt hour) Public Utility, Decoupling Order, Performance Incentive Mechanism, Savings Calculation, Energy Price, Renewable Projects With Storage Capacity Public Utility, Decoupling Order, Performance Incentive Mechanism, Savings Calculation, Energy Price, Renewable Projects With Storage Capacity Energy price, renewable energy-only projects (in dollars per kilowatt hour) Public Utility, Decoupling Order, Performance Incentive Mechanism, Savings Calculation, Energy Price, Renewable Energy-Only Projects Public Utility, Decoupling Order, Performance Incentive Mechanism, Savings Calculation, Energy Price, Renewable Energy-Only Projects Expected savings, phase 1, percent Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 1, Percent Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 1, Percent Performance incentive mechanism, incentive cap Public Utility, Decoupling Order, Performance Incentive Mechanism, Savings Calculation, Incentive Cap Public Utility, Decoupling Order, Performance Incentive Mechanism, Savings Calculation, Incentive Cap Expected savings, Phase 2, January 2019 Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 2, January 2019, Percent Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 2, January 2019, Percent Expected savings, Phase 2, February 2019 Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 2, February 2019, Percent Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 2, February 2019, Percent Expected savings, Phase 2, March 2019 Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 2, March 2019, Percent Public Utility, Decoupling Order, Performance Incentive Mechanism, Expected Savings, Phase 2, March 2019, Percent Performance incentive mechanism penalty Public Utility, Decoupling Order, Performance Incentive Mechanism, Penalty Public Utility, Decoupling Order, Performance Incentive Mechanism, Penalty Number of contracts which qualified for incentives under Phase 1 Public Utility, Number Of Contracts Which Qualified For Incentives Under Phase 1 Public Utility, Number Of Contracts Which Qualified For Incentives Under Phase 1 Incentives accrued Public Utility, Incentives Accrued Public Utility, Incentives Accrued Fair value measurements Fair Value Disclosures [Text Block] Proceeds from sale of available for sale securities Proceeds from Sale of Debt Securities, Available-for-sale AFS, gross realized gains Debt Securities, Available-for-sale, Unrealized Gain Schedule of accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of reclassifications out of accumulated other comprehensive income/(loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Electric utility subsidiaries [Abstract] Electric utility subsidiaries [Abstract] Interim general rate increase granted Public Utilities, Interim General Rate Increase Public Utilities, Interim General Rate Increase Effective interest rate of return Public Utilities, Interim General Rate Increase, Effective Interest Rate Of Return Public Utilities, Interim General Rate Increase, Effective Interest Rate Of Return Stipulated ROACE rate Public Utilities, Stipulated Return On Average Common Equity Rate Public Utilities, Stipulated Return On Average Common Equity Rate Common equity capitalization rate Public Utilities, Interim General Rate Increase, Common Equity Capitalization Public Utilities, Interim General Rate Increase, Common Equity Capitalization Rate Base Public Utilities, Interim General Rate Increase, Rate Base Public Utilities, Interim General Rate Increase, Rate Base Risk sharing percentage, ratepayer Public Utility, General Rate Increase, Risk Sharing Percentage, Ratepayer Public Utility, General Rate Increase, Risk Sharing Percentage, Ratepayer Risk sharing percentage, utility Public Utility, General Rate Increase, Risk Sharing Percentage, Utility Public Utility, General Rate Increase, Risk Sharing Percentage, Utility Maximum exposure cap Public Utility, General Rate Increase, Maximum Exposure Cap Public Utility, General Rate Increase, Maximum Exposure Cap General rate increase, revenue Public Utilities, General Rate Increase, Revenue Public Utilities, General Rate Increase, Revenue General rate increase, revenue, percent Public Utilities, General Rate Increase, Revenue, Percent Public Utilities, General Rate Increase, Revenue, Percent Assumptions on rate of return, return on average common equity, percentage decrease Public Utilities, General Rate Increase, Revenue, Calculation Assumptions, Rate Of Return, Return On Average Common Equity, Percentage Decrease Public Utilities, General Rate Increase, Revenue, Calculation Assumptions, Rate Of Return, Return On Average Common Equity, Percentage Decrease Schedule of statements of income data Condensed Income Statement [Table Text Block] Schedule of statements of comprehensive income data Comprehensive Income (Loss) [Table Text Block] Schedule of balance sheets data Condensed Balance Sheet [Table Text Block] Schedule of the book value and aggregate fair value by major security type Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Schedule of contractual maturities of available-for-sale securities Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of components of loans receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of allowance for loan losses Schedule of Credit Losses for Financing Receivables, Current [Table Text Block] Schedule of credit risk profile by internally assigned grade for loans Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of credit risk profile based on payment activity for loans Past Due Financing Receivables [Table Text Block] Schedule of credit risk profile based on nonaccrual loans, accruing loans 90 days or more past due Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Schedule of the carrying amount and the total unpaid principal balance of impaired loans, with and without recorded allowance for loans losses Impaired Financing Receivables [Table Text Block] Schedule of loan modifications Troubled Debt Restructurings on Financing Receivables [Table Text Block] Schedule of amortized intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of key assumptions used in estimating fair value Schedule of sensitivity analysis of fair value, transferor's interests in transferred financial assets Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Schedule of securities sold under agreements to repurchase Schedule of Assets Sold under Agreements to Repurchase, Other Borrowings [Table Text Block] Tabular disclosure of securities or other assets sold under repurchase agreements when this amount exceeds 10 percent of total assets. Disclosure may include the following: the type of securities or assets sold under agreements to repurchase, the carrying amount, market value (including accrued interest plus any cash or other assets on deposit. The information is segregated into securities maturing (1) overnight; (2) term up to 30 days; (3) term of 30 to 90 days; (4) term over 90 days; (5) demand. Schedule of notional and fair value of derivatives Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of derivative financial instruments Schedule of Derivative Instruments [Table Text Block] Schedule of derivative financial instruments and net gain or loss Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable Troubled Debt Restructurings and Troubled Debt Restructurings that Subsequently Defaulted [Axis] Financing Receivable Troubled Debt Restructurings and Troubled Debt Restructurings that Subsequently Defaulted [Axis] Information related to troubled debt restructurings granted in the current period by class of financing receivable and portfolio segment and troubled debt restructurings in which a modification was made within the last 12 months and for which there was a payment default in the current reporting period by class of financing receivable and portfolio segment. Financing Receivable Troubled Debt Restructurings and Troubled Debt Restructurings that Subsequently Defaulted [Domain] Financing Receivable Troubled Debt Restructurings and Troubled Debt Restructurings that Subsequently Defaulted [Domain] Represents classes of financing receivables and portfolio segments related to trouble debt restructurings granted in the current period and troubled debt restructurings in which a modification was made within the last 12 months and for which there was a payment default in the current reporting period. Troubled debt restructurings real estate loans Financing Receivable Troubled Debt Restructurings Real Estate Loans [Member] Represents the information pertaining to troubled debt restructurings granted during the current period. Troubled debt restructurings Financing receivable modifications minimum, period of payment default of loans determined to be TDRs (in days) Financing Receivable Modifications Minimum, Period of Payment Default of Loans Determined to be Troubled Debt Restructurings Represents the minimum period of payment default of loans determined to be troubled debt restructurings. Commitments to lend additional funds to borrows with impaired or modified loans Troubled Debt Restructuring, Debtor, Subsequent Periods, Contingent Payments, Amount Consumer mortgage loans collateralized by residential real estate property in foreclosure process Financial Receivables, Loans Collateralized by Real Estate in Foreclosure Financial Receivables, Loans Collateralized by Real Estate in Foreclosure Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Hawaiian Electric Company Subsidiaries [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Power purchase agreement Power Purchase Agreement [Abstract] -- None. No documentation exists for this element. -- Number of power purchase agreements (PPAs) (in agreements) Number of Power Purchase Agreements Represents the number of firm power purchase agreements entered into, by the company. Number of entities currently required to be consolidated as VIEs (in entities) Variable Interest Entity Number of Unconsolidated VIEs Represents the number of entities not required to be consolidated as VIEs. Number of IPPs Number Of Independent Power Producers Number Of Independent Power Producers Number of firm capacity producers declining to provide financial information to determine primary beneficiary status (in entities) Number of Firm Capacity Producers Declining to Provide Financial Information Represents information pertaining to number of firm capacity producers declining to provide financial information. Minimum potential number of IPP entities consolidated into company in the future (in entities) Minimum Potential Number of IPP Entities Consolidated Into Company in Future The minimum number of potential IPP's that could be required to be consolidation into the Company in the future based on new financial information provided by IIP's used to determine VIE relationship. New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-02 Accounting Standards Update 2016-02 [Member] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Power Purchase Agreement Power Purchase Agreement [Member] Power Purchase Agreement [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Operating lease, liability Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Net unrealized gains (losses) on available-for-sale investment securities: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized gain (losses) on available-for-sale investment securities arising during the period, net of tax benefits (taxes) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Derivatives qualifying as cash flow hedges: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract] Unrealized interest rate hedging losses arising during the period, net of tax benefits of $380, nil, $520 and nil, respectively Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes Statement of Financial Position [Abstract] Property, plant and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Nonutility property, plant and equipment, accumulated depreciation Non-utilities, Property, Plant and Equipment, Accumulated Depreciation Non-utilities, Property, Plant and Equipment, Accumulated Depreciation Preferred stock, authorized shares (in shares) Preferred Stock, Shares Authorized Preferred stock, issued shares (in shares) Preferred Stock, Shares Issued Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, authorized shares (in shares) Common Stock, Shares Authorized Common stock, issued shares (in shares) Common Stock, Shares, Issued Common stock, outstanding shares (in shares) Common Stock, Shares, Outstanding Supplemental Cash Flow Elements [Abstract] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Interest paid to non-affiliates, net of amounts capitalized Interest Paid to Non Affiliates The amount of cash paid for interest of non-affiliates during the period. Income taxes paid (including refundable credits) Income Taxes Paid Income taxes refunded (including refundable credits) Proceeds from Income Tax Refunds Supplemental disclosures of noncash activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Estimated fair value of noncash contributions in aid of construction (investing) Noncash or Part Noncash Increases Property, Plant and Equipment Contributions in Aid of Construction Noncash (or part noncash) increases in property, plant and equipment due to noncash contributions in aid of construction. Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) Capital Expenditures Incurred but Not yet Paid Common stock issued (gross) for director and executive/management compensation (financing) Stock Issued During Period Value Director and Officer Compensatory Plans Value of stock issued during the period from director and officer compensatory plans in noncash transactions. Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) Real Estate Owned, Transfer from Real Estate Owned Obligations to fund low income housing investments (investing) Affordable Housing Program Assessments Transfer of retail repurchase agreements to deposit liabilities (financing) Transfer To Deposit Liabilities Transfer To Deposit Liabilities Unsettled trades to purchase investment securities (investing) Unsettled Trades To Purchase Investment Securities, Debt Unsettled Trades To Purchase Investment Securities, Debt Number of contracts Financing Receivable, Modifications, Number of Contracts Outstanding recorded investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Net increase in allowance Allowance for Loan and Lease Losses, Period Increase (Decrease) Mortgage revenue bonds Asset-backed Securities [Member] Measurement Input, Credit Spread Measurement Input, Credit Spread [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Principal payments received Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Unrealized gain (loss) included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Ending balance Number of financial instruments held Number Of Financial Instruments Held Number Of Financial Instruments Held Weighted average discount rate Debt Instrument, Measurement Input Number of financial institutions Number of Financial Institutions Represents the number of financial institutions with which the entity entered into a revolving Non Collateralized credit agreement with a letter of credit sub-facility. Line of credit facility Line of Credit [Member] Credit agreement Revolving noncollateralized credit facility with a letter of credit sub-facility Line of Credit Facility, Maximum Borrowing Capacity Schedule of purchases from all IPPs Schedule of Variable Interest Entities [Table Text Block] Schedule of net annual incremental amounts proposed to be collected (refunded) Schedule of Annual Decoupling Filings [Table Text Block] Schedule of Annual Decoupling Filings [Table Text Block] Schedule of condensed consolidating statements of income (loss) Schedule of condensed consolidating statement of comprehensive income Schedule of Condensed Consolidating Statements of Comprehensive Income [Table Text Block] Tabular disclosure of condensed consolidating comprehensive income. Schedule of condensed consolidating balance sheet Schedule of condensed consolidating statement of changes in common stock equity Schedule of Condensed Consolidating Statements of Changes in Common Stock Equity [Table Text Block] Tabular disclosure of changes in condensed consolidating common stock equity. Schedule of condensed consolidating statement of cash flows Condensed Cash Flow Statement [Table Text Block] Revenues Expenses Utilities Operating Expense [Abstract] Equity in earnings of subsidiaries Equity in Earnings of Subsidiaries Represents the amount of equity in earnings of subsidiaries. Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate lock commitments Interest Rate Lock Commitments [Member] Forward commitments Forward Contracts [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not designated as a hedging instrument Not Designated as Hedging Instrument [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Mortgage banking income Fees and Commissions, Mortgage Banking [Member] Fees and Commissions, Mortgage Banking [Member] Derivative instrument Derivative [Line Items] Notional amount Derivative, Notional Amount Fair value Derivative, Fair Value, Net Asset derivatives Derivative Asset, Fair Value, Amount Not Offset Against Collateral Liability derivatives Derivative Liability, Fair Value, Amount Not Offset Against Collateral Net gains (losses) recognized in the Statement of Income Derivative, Gain (Loss) on Derivative, Net Fair value measurements on a recurring basis Fair Value, Measurements, Recurring [Member] Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies Collateralized Mortgage Backed Securities [Member] U.S. Treasury and federal agency obligations US Government Agencies Debt Securities [Member] Corporate bonds Corporate Bond Securities [Member] Interest rate swap Interest Rate Swap [Member] Derivative assets Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] Available-for-sale investment securities Derivative assets Derivative Asset Derivative liabilities Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] Derivative liabilities Derivative Liability Share-based compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Trust Preferred Securities Subject to Mandatory Redemption Trust Preferred Securities Subject to Mandatory Redemption [Member] Trust Common Securities Trust Common Securities [Member] Common securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) or upon an event that is certain to occur, that are issued by a consolidated trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase, from the financial institution that established the trust, an equivalent amount of junior subordinated debentures or other loans having stated maturities. Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] VIE, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Convertible preferred stock Convertible Preferred Stock Preferred securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) or upon an event that is certain to occur, that are issued by a trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase an equivalent amount of junior subordinated debentures or other loans having stated maturities. Investment income, interest Investment Income, Interest Distributions to holders of Trust Preferred Securities Interest Expense, Trust Preferred Securities Common dividends on the trust common securities Dividends Trust Common Securities Adjustment to net income reflecting the dividends paid to the holders of Trust Common Securities. Revenues Revenue from Contract with Customer [Text Block] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Allowance for loan losses Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for loan losses: Financing Receivable, Allowance for Credit Losses [Roll Forward] Valuation allowance, balance at the beginning of the period Financing Receivable, Allowance for Credit Losses Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Provision Provision for Loan, Lease, and Other Losses Valuation allowance, balance at the end of the period Ending balance: individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Ending balance: collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Financing Receivables: Financing Receivable, Net [Abstract] Total financing receivables Ending balance: individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Ending balance: collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Electric energy sales - residential Electric Energy Sales, Residential [Member] Electric Energy Sales, Residential [Member] Electric energy sales - commercial Electric Energy Sales, Commercial [Member] Electric Energy Sales, Commercial [Member] Electric energy sales - large light and power Electric Energy Sales, Large Light And Power [Member] Electric Energy Sales, Large Light And Power [Member] Electric energy sales - other Electric Energy Sales, Other [Member] Electric Energy Sales, Other [Member] Bank fees Bank Fees [Member] Bank Fees [Member] Revenues from Other Sources Revenues From Other Sources [Member] Revenues From Other Sources [Member] Regulatory revenue Regulatory Revenue [Member] Regulatory Revenue [Member] Bank interest and dividend income Bank Interest And Dividend Income [Member] Bank Interest And Dividend Income [Member] Other bank noninterest income Other Bank Noninterest Income [Member] Other Bank Noninterest Income [Member] Other Other Revenue Sources [Member] Other Revenue Sources [Member] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Services/goods transferred at a point in time Transferred at Point in Time [Member] Services/goods transferred over time Transferred over Time [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenues from contracts with customers Revenue from Contract with Customer, Including Assessed Tax Total revenues Revenues Offsetting Liabilities [Table] Offsetting Liabilities [Table] Commercial account holders Commercial Account Holders [Member] Represents information pertaining to commercial account holders, a counterparty to the agreement. Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] FHLB advances Federal Home Loan Bank Advances Gross amount of recognized liabilities Securities Sold under Agreements to Repurchase, Gross Gross amount offset in the Balance Sheets Securities Sold under Agreements to Repurchase, Asset Securities sold under agreements to repurchase Securities sold under agreements to repurchase collateral, financial instruments Securities Sold under Agreements to Repurchase Collateral Right to Reclaim Financial Instruments Amount of right to receive financial instruments collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase. Securities sold under agreements to repurchase, cash collateral pledged Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash Reclassification Out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Impact of D&Os of the PUC included in regulatory assets Accumulated Defined Benefit Plans Adjustment, Impact Of Decision And Orders Of The Public Utility Commission Included In Regulatory Assets [Member] Accumulated Defined Benefit Plans Adjustment, Impact Of Decision And Orders Of The Public Utility Commission Included In Regulatory Assets [Member] Reclassifications out of accumulated other comprehensive income/(loss) Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Total reclassifications Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Fair Value, by Balance Sheet or Off Balance Sheet Grouping [Table] Fair Value, by Balance Sheet or Off Balance Sheet Grouping [Table] Fair value disclosures related to financial assets (as defined) and financial liabilities (as defined) whether contained in the entity's balance sheet or held off-balance sheet. Disclosures contained in this table include the carrying (reported) amount, the portion of the financial instrument (as defined) at fair value, portion at other than fair value, estimate of fair value, and the change in fair value during the period. Carrying or notional amount Reported Value Measurement [Member] Estimated fair value of financial instruments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Stock in Federal Home Loan Bank Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Financial liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposit liabilities Deposits, Fair Value Disclosure Short-term borrowings—other than bank Other Short-term Borrowings Other bank borrowings Other Bank Borrowings This element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents other bank borrowings as of the balance sheet date, including securities sold under agreements to repurchase and advances from the Federal Home Loan Bank. Long-term debt, net Long-term Debt, Fair Value Short-term borrowings Short-term Debt, Fair Value Document and Entity Information -- None. No documentation exists for this element. -- Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Registrant Name Entity Registrant Name Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of each class Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Schedule of share-based compensation expense and related income tax benefit Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of common stock granted to a nonemployee director under the 2011 Director Plan Schedule of Share-based Compensation, Nonemployee Director Stock Award Plan, Activity [Table Text Block] Schedule of restricted stock units Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Long-Term Incentive Plan (LTIP) linked to total return to shareholders Schedule of Share Based Compensation, Long term Incentive Plan Linked to Total Return to Shareholders [Table Text Block] Tabular disclosure of the number and weighted-average grant date fair value for long-term incentive plan awards that were outstanding at the beginning and end of the year, and the number that were granted, vested, or forfeited during the year. Schedule of Long-Term Incentive Program fair value awards granted