Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Summary of Significant Accounting and Reporting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Equity [Abstract] Dividends on Common Stock Stockholders' Equity Note Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Net Income Net Income (Loss) Attributable to Parent Unrealized holdings (loss) gain on securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Unrealized gains on unrecognized post-retirement costs Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Unrealized (loss) gain on TRUPs Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Tax benefit (expense) related to securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Tax expense related to unrecognized post-retirement costs Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Tax benefit (expense) related to TRUPs Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, Tax Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Cash paid during the period for [Abstract] -- None. No documentation exists for this element. -- Interest Interest Paid Income taxes Income Taxes Paid Noncash investing activities: Noncash Investing and Financing Items [Abstract] Unrealized gains on TRUPs Fair Value, Option, Credit Risk, Gross Gains on Assets Fair Value, Option, Credit Risk, Gross Gains on Assets Stock dividends issued Stock Issued Cash dividend declared Dividends, Common Stock, Cash Adoption of ASU 2016-01: reclassification of TRUPS to accumulated other comprehensive income Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax Adoption of ASU 2016-01: recognition of previously unrealized losses within marketable equity securities Cumulative Effect on Retained Earnings, Net of Tax Supplemental Cash Flow Disclosures Cash Flow, Supplemental Disclosures [Text Block] Income Statement [Abstract] Interest Income: Interest and Dividend Income, Operating [Abstract] Loans, including fees Interest and Fee Income, Loans and Leases Investment securities – AFS – taxable Interest Income, Securities, Operating, Taxable Interest on deposits in FRB Interest Income, Deposits with Financial Institutions Interest on deposits in other banks Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest Expense: Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on other borrowings Interest Expense, Loans from Other Federal Home Loan Banks Total interest expense Interest Expense Net Interest Income Interest Income (Expense), Net Recovery of Provision for Credit Losses Provision for Loan and Lease Losses Net Interest Income after Recovery of Provision for Credit Losses Interest Income (Expense), after Provision for Loan Loss Noninterest Income: Noninterest Income [Abstract] Customer service fees Fees and Commissions Increase in cash surrender value of bank-owned life insurance Bank Owned Life Insurance Income Loss on marketable equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Equity Securities, FV-NI, Unrealized Gain (Loss) Gain on proceeds from bank-owned life insurance Gain (Loss) on Sale of Insurance Block Loss on fair value of financial liability Gain (Loss) on Fair Value Option of Financial Liability The net gain (loss) resulting from the change in the fair value estimate of liabilities elected to be measured under the adoption of FAS 159. Gain on sale of assets Gain (Loss) on Disposition of Property Plant Equipment Other Noninterest Income, Other Operating Income Total noninterest income Noninterest Income Noninterest Expense: Noninterest Expense [Abstract] Salaries and employee benefits Labor and Related Expense Occupancy expense Occupancy, Net Data processing Information Technology and Data Processing Professional fees Professional Fees Regulatory assessments Federal Deposit Insurance Corporation Premium Expense Director fees Noninterest Expense Directors Fees Correspondent bank service charges Correspondent Bank Service Charges Fees paid for the electronic processing and settlement of funds transactions with the Federal Reserve as serviced through an intermediary, or correspondent bank. Loss on California tax credit partnership Income (Loss) from Equity Method Investments Net cost (gain) on operation and sale of OREO Gains (Losses) on Sales of Investment Real Estate Other Other Noninterest Expense Total noninterest expense Noninterest Expense Income Before Provision for Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision for Taxes on Income Income Tax Expense (Benefit) Net Income Net Income per common share Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Shares on which net income per common shares were based Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Number of subsidiaries Number of Subsidiaries Number of Subsidiaries Receivables [Abstract] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Grades 1 and 2 Grades 1 and 2 [Member] Credit quality indicators that are developed and used internally by the company. Grade 3 Grade 3 [Member] Credit quality indicators that are developed and used internally by the company. Grades 4 and 5 – pass Grade 4 and 5 Pass [Member] A category of financing receivables not considered to be special mention, substandard, doubtful, and loss receivables. Grade 6 – special mention Grade 6 Special Mention [Member] A category of financing receivables considered to have potential weaknesses that deserve management's close attention. If left uncorrected, those potential weaknesses may result in a deterioration of the repayment prospects for the asset or of the creditor's position at some future date. Grade 7 – substandard Grade 7 Substandard [Member] A category of financing receivables that are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the creditor will sustain some loss if the deficiencies are not corrected. Grade 8 – doubtful Grade 8 Doubtful [Member] A category of financing receivables that have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Not graded Not Graded [Member] Not Graded [Member] Pass Pass [Member] Special Mention Special Mention [Member] Substandard Substandard [Member] Doubtful Doubtful [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Commercial Risk, Construction, and Other Non-Consumer Loans [Member] Commercial Risk Construction and Other Non Consumer Loans [Member] Class of financing receivables related to commercial, construction, and other non-consumer related loans. Commercial and Industrial Commercial And Industrial [Member] Amount of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements. Commercial Real Estate Commercial Real Estate Term Loans [Member] This element represent total commercial real estate term loans. Real Estate Construction and Development Loans Construction Loans [Member] Agricultural Agricultural [Member] A loan, whether secured or unsecured, to a company for agricultural purposes. Residential Mortgages Residential Mortgage [Member] Home Improvement and Home Equity Home Improvement [Member] Class of receivables related to home improvement. Installment Installment [Member] A installment loan, whether secured or unsecured, to a company. Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Number of risk rating approaches Number Of Risk Rating Approaches Number of risk rating approaches evaluated to assign risk ratings to loan receivable. Notes receivable, period of loss recognition Notes Receivable, Period of Loss Recognition Period for recognition of loss in the event of default in the payment of notes receivable. Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract] Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract] -- None. No documentation exists for this element. -- Total Financing Receivable, Net Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract] Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract] -- None. No documentation exists for this element. -- Total Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-01 Accounting Standards Update 2016-01 [Member] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Dividend declared Dividend Declared [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock Common Stock [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive (Loss) Gain AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Unvested restricted shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Dividends declared on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Dividends payable (in dollars per share) Dividends Payable, Amount Per Share Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance (in shares) Common Stock, Shares, Outstanding Balance Stockholders' Equity Attributable to Parent Other comprehensive income (loss) Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Reclassification of income tax effects from accumulated other comprehensive income Reclassification from AOCI, Current Period, Tax Adoption of ASU 2016-01: reclassification of TRUPS to accumulated other comprehensive income Common stock dividends (in shares) Common Stock Dividends, Shares Common stock dividends Stock Issued During Period, Value, Stock Dividend Dividends on common stock Stock options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock options exercised Stock Issued During Period, Value, Stock Options Exercised Restricted stock units released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Restricted stock units released Stock Issued During Period, Value, New Issues Stock-based compensation expense Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Balance (in shares) Balance Fair Value Disclosures [Abstract] Fair value of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Description of the valuation technique, unobservable input, and qualitative information about the unobservable inputs for the company's assets and liabilities classified as level 3 and measured at fair value on a recurring basis Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] Assets and liabilities measured at fair value on recurring and non-recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Significant unobservable inputs (level 3) on a recurring basis Reconciliation Of Assets And Liabilities At Fair Value Using Significant Unobservable Inputs Level 3 On Recurring Basis [Table Text Block] Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liabilities. Income Tax Disclosure [Abstract] Deferred tax assets, valuation allowance Deferred Tax Assets, Valuation Allowance Effective income tax rate, percent Effective Income Tax Rate Reconciliation, Percent Loans Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Delinquent loans Past Due Financing Receivables [Table Text Block] Nonaccrual loan balances Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Impaired loans Impaired Financing Receivables [Table Text Block] Troubled debt restructuring activity Troubled Debt Restructurings on Financing Receivables [Table Text Block] TDR activity by loan category Schedule Of TDR Activity By Loan Category [Table Text Block] Tabular disclosure of financing receivables and troubled debt restructurings. Credit risk rating for commercial, construction and non-consumer related loans Summary Of Credit Risk Rating For Commercial Construction And Non Consumer Related Loans [Table Text Block] Tabular disclosure of financing receivables by credit quality indicator for commercial, construction, and non-consumer related loans. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. Credit risk ratings for consumer related loans and other homogenous loans Summary Of Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Table Text Block] Tabular disclosure of financing receivables by credit quality indicator for consumer related loans and other homogenous loans. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. Credit quality indicators for outstanding student loans Financing Receivable Credit Quality Indicators [Table Text Block] Allowance for credit loses by loan category Allowance for Credit Losses on Financing Receivables [Table Text Block] Summarized loan balances Summarized Information With Respect To Loan Balances [Table Text Block] Tabular disclosure of summarized information about financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable). Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] ReliaMax ReliaMax [Member] ReliaMax [Member] Student loan Student Loan [Member] Loan Status [Axis] Loan Status [Axis] Loan Status [Axis] Loan Status [Domain] Loan Status [Domain] [Domain] for Loan Status [Axis] School School [Member] School [Member] Grace Grace [Member] Grace [Member] Repayment Repayment [Member] Repayment [Member] Deferment Deferment [Member] Deferment [Member] Forbearance Forbearance [Member] Forbearance [Member] Claim Claim [Member] Claim [Member] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Past due dates, delinquent Financing Receivable, Recorded Investment, Past Due, Term Financing Receivable, Recorded Investment, Past Due, Term Number of loans Number of Loans Number of Loans Financing receivable Financing Receivable, Gross Goodwill Goodwill Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Consumer Loan Consumer Loan [Member] Total Commercial and Industrial Total Commercial and Industrial [Member] This element represent the total amount of commercial and industrial loans. Commercial and Business Loans Commercial Loan [Member] Government Program Loans Government Program Loans [Member] Information about government program loans. Total Real Estate Mortgage Total Real Estate Mortgage [Member] Total amounts due the Company for loans secured by the collateral of specified real estate property and which loan the borrower (debtor) is obligated to repay in accordance with a predetermined set of payments. Commercial Real Estate Loans Commercial Real Estate Loans [Member] This element represent total commercial real estate loans. Residential Mortgage Loans Residential Mortgages [Member] Class of financing receivables related to residential mortgages. Home Improvement and Home Equity loans Home Equity Line of Credit [Member] Real Estate Mortgage Mortgage Receivable [Member] Installment & Other Total Installment and Other [Member] Total financing receivables for total installment and other receivables. Unallocated Unallocated Financing Receivables [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Number of loan portfolio segment Number of Loan Portfolio Segment Number of Loan Portfolio Segment Number of segments Number of Operating Segments Number of loans entity experienced losses over past twelve quarters Number of Loans Entity Experienced Losses Number of Loans Entity Experienced Losses Summarizes activity in allowance for credit losses by loan category [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Beginning balance Financing Receivable, Allowance for Credit Losses Provision (recovery of provision) for credit losses Provision for Loan, Lease, and Other Losses Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Net recoveries Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) Ending balance Period-end amount allocated to [Abstract] Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Loans individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Loans collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Ending balance Loans Individually Evaluated for Impairment Financing Receivable, Individually Evaluated for Impairment Loans Collectively Evaluated for Impairment Financing Receivable, Collectively Evaluated for Impairment Total Loans Loans and Leases Receivable, Gross Schedule of components of accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income: to cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Recovery of provision for credit losses Depreciation and amortization Depreciation, Amortization and Accretion, Net Amortization of investment securities Amortization of Investment Securities Amortization of Investment Securities Accretion of investment securities Accretion (Amortization) of Discounts and Premiums, Investments Increase in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Decrease in accrued interest payable Increase (Decrease) in Interest Payable, Net Decrease in accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Decrease in unearned fees and unamortized loan origination costs, net Increase (Decrease) in Unearned Premiums Increase in income taxes receivable Increase (Decrease) in Income Taxes Payable Unrealized loss on marketable equity securities Stock-based compensation expense Share-based Compensation Provision for deferred income taxes Deferred Income Tax Expense (Benefit) Gain on sale of other real estate owned Gains (Losses) on Sales of Other Real Estate Gain on bank owned life insurance Increase in cash surrender value of bank-owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value Loss on fair value option of financial liabilities Gain Loss On Fair Value Of Financial Instruments Net Pretax The net gain (loss) resulting from the change in the fair value estimate of assets/Liabilities elected to be measured under the adoption of FAS 159. Loss on tax credit limited partnership interest Gain on sale of premises and equipment Net increase in other assets Increase (Decrease) in Other Operating Assets Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Net increase in interest-bearing deposits with banks Proceeds from (Payments for) in Interest-bearing Deposits in Banks Purchase of correspondent bank stock Payments for (Proceeds from) Federal Home Loan Bank Stock Purchases of available-for-sale securities Payments to Acquire Available-for-sale Securities Principal payments of available-for-sale securities Principal Payments of Available for Sale Securities Principal Payments of Available for Sale Securities Net decrease in loans Payments for (Proceeds from) Loans and Leases Cash proceeds from sales of other real estate owned Proceeds from Sale of Other Real Estate Investment in limited partnership Payments for (Proceeds from) Limited Partnership Proceeds from bank owned life insurance Proceeds from Life Insurance Policy Capital expenditures of premises and equipment Payments to Acquire Property, Plant, and Equipment Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase in demand deposits and savings accounts Increase (Decrease) in Other Deposits Net increase (decrease) in time deposits Increase (Decrease) in Time Deposits Proceeds from exercise of stock options Proceeds from Stock Options Exercised Dividends on common stock Payments of Ordinary Dividends, Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Short term Borrowings/Other Borrowings [Abstract] -- None. No documentation exists for this element. -- Short-term Borrowings/Other Borrowings Debt Disclosure [Text Block] Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Deposits [Abstract] Deposits summary Deposit Liabilities, Type [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] U.S. Government agencies US Government Agencies Debt Securities [Member] U.S. Government sponsored entities & agencies collateralized by mortgage obligations Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Description of Assets [Abstract] Assets, Fair Value Disclosure [Abstract] AFS Securities [Abstract] Available-for-sale Securities [Abstract] AFS Investment securities Available-for-sale Securities, Debt Securities Marketable equity securities Equity Securities, FV-NI Equity Securities, FV-NI Total investment securities Investments, Fair Value Disclosure Total Assets, Fair Value Disclosure Description of Liabilities [Abstract] Liabilities, Fair Value Disclosure [Abstract] Junior subordinated debt Subordinated Debt Obligations, Fair Value Disclosure Total Financial and Nonfinancial Liabilities, Fair Value Disclosure Write down on other real estate owned Impairment of Real Estate Net Income per Common Share Earnings Per Share [Text Block] Taxes on Income Income Tax Disclosure [Text Block] Dividends on common stock Dividends payable Dividends Payable, Current Authorized repurchase amount, common stock Stock Repurchase Program, Authorized Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] 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] Carrying Amount Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Quoted Prices In Active Markets for Identical Assets Level 1 Significant Other Observable Inputs Level 2 Significant Unobservable Inputs Level 3 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investment securities Loans Loans Receivable, Fair Value Disclosure Accrued interest receivable Accrued Interest Receivable Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents interest receivable as presented on the statement of financial position. Financial Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposits: Noninterest-bearing Noninterest bearing fair value disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all deposit liabilities held by the entity for noninterest bearing. NOW and money market NOW And Money Market Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all deposit liabilities held by the entity for negotiable orders of withdrawal (NOW). Savings Savings Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of savings. Time deposits Time Deposits Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all deposit liabilities for time deposits. Total deposits Deposits, Fair Value Disclosure Junior subordinated debt Accrued interest payable Accrued Interest Payable Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the accrued interest payable as of the balance sheet date. Statement of Financial Position [Abstract] Liabilities & Shareholders' Equity Liabilities and Equity [Abstract] Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value (in dollars per share) Common Stock, No Par Value Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net unrealized loss on available for sale securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Unfunded status of the supplemental retirement plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Net unrealized gain on junior subordinated debentures Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification from accumulated other comprehensive income, current period Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other comprehensive income (loss) 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] Junior Subordinated Debt Junior Subordinated Debt [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] United Security Bank United Security Bank [Member] United Security Bank [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Valuation technique, discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Valuation Technique, Discounted Cash Flow [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, frequency of periodic payment Debt Instrument, Frequency of Periodic Payment Amount of junior subordinated debentures relating to trust preferred securities Debt Instrument, Face Amount Maximum number of consecutive quarters the entity defer interest payments without default or penalty Maximum Number of Consecutive Quarters the Entity Defer Interest payments Without Default or Penalty The terms of the debentures and trust indentures allow for the entity to defer interest payments for a number of maximum consecutive quarters without default or penalty. Debt instrument, unamortized discount rate Debt Instrument, Amount Sold at Discount, Percentage Debt Instrument, Amount Sold at Discount, Percentage Debt instrument, repurchased face amount Extinguishment of Debt, Amount Gain on redemption of Jr subordinated debentures Gain (Loss) on Extinguishment of Debt Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Life of debt instrument Long Term Debt Instrument, Period Period over which long term debt is payable. Adjustment for difference between comparable sales Fair Value Inputs, Discount Rate Fair value measurement option, gain (loss) on long-term debt instruments Fair Value, Option, Aggregate Differences, Long-term Debt Instruments Gain (loss) on fair value financial liability Gain (Loss) on Fair Value Option of Financial Liability, Net Gain (Loss) on Fair Value Option of Financial Liability, Net Loss on fair value financial liability, gross Fair Value, Option, Credit Risk, Gross Losses on Assets Fair Value, Option, Credit Risk, Gross Losses on Assets Loss on fair value financial liability, net Fair Value, Option, Credit Risk, Losses on Assets, Net Fair Value, Option, Credit Risk, Losses on Assets, Net Gain on fair value financial liability, gross Gain on fair value financial liability, net Fair Value, Option, Credit Risk, Gains on Assets, Net Fair Value, Option, Credit Risk, Gains on Assets, Net Gain (loss) on fair value financial liability, OCI, net Impact of adoption on earnings per share, basic (in dollars per share) Impact of Adoption on Earnings Per Share, Basic Impact of Adoption on Earnings Per Share, Basic Impact of adoption on earnings per share, diluted (in dollars per share) Impact of Adoption on Earnings Per Share, Diluted Impact of Adoption on Earnings Per Share, Diluted Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Comparison of amortized cost and fair value of securities available for sale [Abstract] Comparison of amortized cost and fair value of securities available for sale [Abstract] -- None. No documentation exists for this element. -- Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value (Carrying Amount) Amortized cost and fair value of securities available for sale by contractual maturity [Abstract] Available-for-sale Securities, Debt Maturities [Abstract] Amortized Cost [Abstract] Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Collateralized mortgage obligations Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Fair Value (Carrying Amount) [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Collateralized mortgage obligations Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Available-for-sale securities, gross realized gains Debt Securities, Available-for-sale, Realized Gain Debt Securities, Available-for-sale, Realized Gain Available-for-sale securities, gross realized losses Debt Securities, Available-for-sale, Realized Loss Debt Securities, Available-for-sale, Realized Loss OTTI losses, investments Other than Temporary Impairment Losses, Investments Fair value of available-for-sale securities pledged as collateral for FHLB borrowings Available-for-sale Securities Pledged as Collateral Summarizes temporarily impaired investment securities [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 Months, Fair Value (Carrying Amount) Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Less than 12 Months, Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or More, Fair Value (Carrying Amount) Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 12 Months or More, Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Fair Value (Carrying Amount) Debt Securities, Available-for-sale, Unrealized Loss Position Debt Securities, Available-for-sale, Unrealized Loss Position Total Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Number of impaired securities Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Number of general segments for the segregation of portfolio Number Of General Segments For The Segregation Of Portfolio This element represents the number of segments for the valuation of investment securities. Held-to-maturity securities Held-to-maturity Securities Trading securities Trading Securities Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Loans 30-60 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] Loans 61-89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] Loans 90 or More Days Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Class of Financing Receivable [Axis] Commercial Real Estate Commercial Real Estate [Member] Agricultural Loans Total Agricultural [Member] This element represent total agricultural loans. Consumer Loans Consumer Portfolio Segment [Member] Overdraft Protection Lines Overdraft Protection Lines [Member] The total amount of financing receivables for overdraft protection. Overdrafts Overdraft [Member] This element represent total amount of overdraft receivables. Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Total Past Due Loans Financing Receivable, Recorded Investment, Past Due Current Loans Financing Receivable, Recorded Investment, Current Accruing Loans 90 or More Days Past Due Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Minimum period of default Period of Default, Minimum Minimum period of default for principal and interest on the loan to placed the loans on non-accrual status. Number of monthly payments to demonstrate repayment ability Number Of Monthly Payments To Demonstrate Repayment Ability Number of monthly payments to demonstrate repayment ability for reclassification of loan to accrual status. Nonaccrual loans balances [Abstract] Nonaccrual loans balances [Abstract] -- None. No documentation exists for this element. -- Total Loans Financing Receivable, Recorded Investment, Nonaccrual Status Loans, increase (decrease) Financing Receivable, Recorded Investment, Nonaccrual Status, Increase (Decrease) in Loans Financing Receivable, Recorded Investment, Nonaccrual Status, Increase (Decrease) in Loans Undisbursed commitments Loans and Leases Receivable, Loans in Process Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Assets Assets [Abstract] Cash and non-interest bearing deposits in other banks Cash and Due from Banks [Abstract] Cash and non-interest bearing deposits in other banks Cash and Due from Banks Due from Federal Reserve Bank (FRB) Due From FRB Interest Bearing Cash Includes cash invested in overnight funds with the Federal Reserve Bank through an excess reserve account established by the bank's agent. Cash and cash equivalents Cash, Cash Equivalents, and Federal Funds Sold Investment securities (at fair value) Investments, Fair Value Disclosure [Abstract] Available for sale (AFS) securities Total investment securities Short-term Investments Loans Loans and Leases Receivable, Net Amount [Abstract] Loans Unearned fees and unamortized loan origination costs, net Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Allowance for credit losses Loans and Leases Receivable, Allowance Net loans Loans and Leases Receivable, Net Amount Accrued interest receivable Interest Receivable Premises and equipment – net Property, Plant and Equipment, Net Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Cash surrender value of life insurance Bank Owned Life Insurance Investment in limited partnerships Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Deferred tax assets - net Deferred Tax Assets, Net of Valuation Allowance Other assets Other Assets Total assets Assets Liabilities Liabilities [Abstract] Deposits Noninterest bearing Noninterest-bearing Deposit Liabilities Interest bearing Interest-bearing Deposit Liabilities Total deposits Deposits Accrued interest payable Interest Payable Accounts payable and other liabilities Accounts Payable and Other Accrued Liabilities Junior subordinated debentures (at fair value) Subordinated Debt Total liabilities Liabilities Common stock, no par value 20,000,000 shares authorized, 16,901,618 issued and outstanding at June 30, 2018, and 16,885,615 at December 31, 2017 Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Total liabilities and shareholders' equity Liabilities and Equity Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Class of Receivable [Axis] Total Installment Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Unpaid Contractual Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Recorded Investment With No Allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Recorded Investment With Allowance Impaired Financing Receivable, with Related Allowance, Recorded Investment Total Recorded Investment Impaired Financing Receivable, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Interest Recognized Impaired Financing Receivable, Interest Income, Accrual Method Impaired financing receivable, interest income, cash basis method Impaired Financing Receivable, Interest Income, Cash Basis Method Accrued interest receivable Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Single Family Residential Loans Single Family Residential Loans [Member] Class of loans related to single family residential loans. Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Financing receivable, period of successful payment history used for restructured loan accrual status Financing Receivable, Period of Successful Payment History Used for Restructured Loan Accrual Status Financing Receivable, Period of Successful Payment History Used for Restructured Loan Accrual Status Troubled Debt Restructurings [Abstract] Troubled Debt Restructurings [Abstract] -- None. No documentation exists for this element. -- Number of Contracts Financing Receivable, Modifications, Number of Contracts During Period 2 Number of financing receivables that have been modified by troubled debt restructurings. Pre- Modification Outstanding Recorded Investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Post- Modification Outstanding Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Number of Contracts which Defaulted During Period Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded Investment on Defaulted TDRs Financing Receivable, Modifications, Subsequent Default, Recorded Investment Number of restructured loans Number Of Restructured Loans Number of financing receivables that have been restructured. Total restructured loans Total Restructured Loans Amount of investment related to financing receivables restructured by troubled debt restructurings. TDR activity by loan category [Roll Forward] Financing Receivable, Modifications, Recorded Investment [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Beginning balance Financing Receivable, Modifications, Recorded Investment Defaults Financing Receivable Modifications Defaults Amount of recorded investment related to financing receivables modified by troubled debt restructuring for which there was a payment default. Additions Financing Receivable Modifications Additions Additions during period to recorded investment related to financing receivables modified by troubled debt restructuring. Principal reductions Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Charge-offs Financing Receivables, Impaired, Troubled Debt Restructuring, Credit Losses Write Offs Financing Receivables, Impaired, Troubled Debt Restructuring, Credit Losses Write Offs Ending balance Allowance for loan loss Financing Receivable Modification, Allowance for loan losses Allowance for loan losses of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Net income Net Income (Loss) Available to Common Stockholders, Basic Weighted average shares issued (in shares) Add: dilutive effect of stock options (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average shares outstanding adjusted for potential dilution (in shares) Basic earnings per share (in dollars per share) Diluted earnings per share (in dollars per share) Anti-dilutive shares excluded from earnings per share calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Deposits Deposit Liabilities Disclosures [Text Block] Fair Value Measurements and Disclosure Fair Value Disclosures [Text Block] Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Repayment, Deferment, and Forbearance Repayment, Deferment, and Forbearance [Member] Repayment, Deferment, and Forbearance [Member] Receivable Type [Axis] Receivable Type [Axis] Loans [Domain] Receivable [Domain] Installment and Student Loans Installment and Student Loans [Member] Installment and Student Loans [Member] Commitments to Extend Credit Commitments to Extend Credit [Member] Standby Letters of Credit Standby Letters of Credit [Member] Loan Purchase Commitments Loan Purchase Commitments [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Total Loans Percentage of total loans (in hundredths) Percentage Of Total Loans This element represent percentage of financing receivables. Student loans, installment Loans and Leases Receivable, Gross, Consumer, Installment, Student Fair value, concentration of risk, commitments Fair Value, Concentration of Risk, Commitments Purchase commitment Purchase Obligation Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Valuation Technique Fair Value Measurements, Valuation Techniques Weighted Average (in hundredths) Junior Subordinated Debt/Trust Preferred Securities Subordinated Borrowings Disclosure [Text Block] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Junior Subordinated Debt Subordinated Debt Obligations [Member] Reconciliation of Liabilities [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Reconciliation of Liabilities [Roll Forward] Reconciliation of Liabilities [Roll Forward] Reconciliation of Liabilities [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Gross loss included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Gross loss (gain) related to changes in instrument specific credit risk Fair Value, Option, Credit Risk, Gains (Losses) on Assets Change in accrued interest Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net Ending balance The amount of total (gain) loss for the period included in earnings attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Supplemental cash flow disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Federal Reserve Bank of San Francisco Federal Reserve Bank Advances [Member] Federal Home Loan Bank (FHLB) Federal Home Loan Bank Advances [Member] Pacific Coast Bankers Bank Pacific Coast Bankers Bank [Member] Pacific Coast Bankers Bank [Member] Union Bank Union Bank [Member] Union Bank [Member] Zions First National Bank Zions First National Bank [Member] Zions First National Bank [Member] Short-term Debt [Line Items] Short-term Debt [Line Items] Unused borrowing lines Line of Credit Facility, Remaining Borrowing Capacity Investment securities pledged as collateral Security Owned and Pledged as Collateral, Fair Value Qualifying loans pledged as collateral for borrowing lines Loans Pledged as Collateral Short-term debt outstanding Long-term Federal Home Loan Bank Advances, Current Computation of income (loss) per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Comparison of amortized cost and fair value of securities available for sale Debt Securities, Available-for-sale [Table Text Block] Debt Securities, Available-for-sale [Table Text Block] Contractual maturities on collateralized mortgage obligation Investments Classified by Contractual Maturity Date [Table Text Block] Temporarily impaired investment securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] [Table Text Block] for Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Noninterest-bearing deposits Interest-bearing deposits: Interest-bearing Deposit Liabilities [Abstract] NOW and money market accounts Deposits, Money Market Deposits and Negotiable Order of Withdrawal (NOW) Savings accounts Deposits, Savings Deposits Under $250,000 Time Deposits, Less Than $250,000 Time Deposits, Less Than $250,000 $250,000 and over Time Deposits, $250,000 or More Time Deposits, $250,000 or More Total interest-bearing deposits Total brokered deposits included in time deposits above Interest Bearing Deposit Brokered Amount of interest-bearing third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. Loans Financing Receivables [Text Block]