Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Document Period End Date Document Period End Date Entity [Domain] Entity [Domain] Trading Symbol Trading Symbol Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Legal Entity [Axis] Legal Entity [Axis] Document Type Document Type Award Type [Axis] Award Type [Axis] Securities in unrealized loss positions (Number of investments) Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Net gains from sale of securities Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Accounting Policies [Abstract] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Additional paid-in capital Additional Paid in Capital Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Amortization Amortization Restricted stock compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition Stock option compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Advertising Advertising Expense Advertising Expense Advertising Costs Advertising Costs, Policy [Policy Text Block] Share-based compensation expense Allocated Share-based Compensation Expense Recoveries of loans charged off Allowance for Loan and Lease Loss, Recovery of Bad Debts Allowance for Loan and Lease Losses [Roll Forward] Allowance for Loan and Lease Losses [Roll Forward] Charged-off loans Loans charged off Allowance for Loan and Lease Losses, Write-offs Amortization of intangible assets Aggregate amortization expense of core deposit premium intangible Amortization of intangible assets Anti-dilutive securities excluded from computation of earnings per share (in shares) Antidilutive securities excluded from computation of earnings per share (in shares) ASSETS Assets: Assets [Abstract] Total assets Assets Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Securities available-for-sale Available-for-sale Securities Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Securities Available-for-sale Securities [Table Text Block] Amortized Cost Amortized Cost Due from five years to ten years, Amortized Cost Securities Available for Sale, Due from five years to ten years, Amortized Cost Less than 12 Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Due in one year or less, Amortized Cost Securities Available for Sale, Due in one year or less, Amortized Cost 12 Months or Greater, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Due after ten years, Amortized Cost Securities Available for Sale, Due after ten years, Amortized Cost Due after ten years, Fair Value Securities Available for Sale, Due after ten years, Fair Value Due from five years to ten years, Fair Value Securities Available for Sale, Due from five years to ten years, Fair Value Mortgage-backed securities, Fair Value Securities Available for Sale, Mortgage-backed securities, Fair Value Due from one year to five years, Fair Value Securities Available for Sale, Due from one year to five years, Fair Value Securities available for sale Securities available for sale Securities available-for-sale, at fair value Fair Value Due from one year to five years, Amortized Cost Securities Available for Sale, Due from one year to five years, Amortized Cost Mortgage-backed securities, Amortized Cost Securities Available for Sale, Mortgage-backed securities, Amortized Cost Due in one year or less, Fair Value Securities Available for Sale, Due in one year or less, Fair Value Losses realized Available-for-sale Securities, Gross Realized Losses Gains realized Banking and Thrift [Abstract] Building and Leasehold Improvements [Member] Building and Building Improvements [Member] Building and leasehold improvements Buildings and Improvements, Gross Loans Loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Core deposit intangible Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Investment securities available for sale Investment securities available for sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Estimated fair value of SMBK common stock issued (in shares) Business Combination, Consideration Transferred, Equity Interests Issued and Issuable FHLB advances and other borrowings Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Cash and cash equivalents Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Market price of SMBK common stock (in dollars per share) Market price of SMBK common stock on May 1, 2018 (in dollars per share) Business Acquisition, Share Price Estimated fair value of Capstone stock options Estimated fair value of Capstone stock options Business Combination, Consideration Transferred, Other Total consideration Total consideration Business Combination, Consideration Transferred Prepaid and other assets Prepaid and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets FHLB advances and other borrowings Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Payables and other liabilities Payables and other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Pro forma net income (loss) Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Pro forma revenue Pro forma revenue, acquisition Estimated common stock issued (in shares) Shares of SMBK common stock issued to TN Bancshares shareholders as of May 1, 2018 (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business Acquisition [Axis] Business Acquisition [Axis] Business Combinations [Abstract] Voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Business Combinations Business Combinations Policy [Policy Text Block] Business Combination Business Combination Disclosure [Text Block] Pro forma, revenue of acquiree since acquisition date, actual Pro-forma revenue Pro forma information, earnings (loss) since acquisition date, actual Pro-forma net income Total fair value of net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets Premises and equipment Premises and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Deposits Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Fair value of assets acquired and liabilities assumed: Fair value of assets acquired and liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Merger expenses Business Combination, Acquisition Related Costs Total Capital (to Risk-Weighted Assets), Actual Amount Capital Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent) Capital to Risk Weighted Assets Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent) Total risk-based capital ratio required to well-capitalized Capital Required to be Well Capitalized to Risk Weighted Assets Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount Capital Required for Capital Adequacy Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount Capital Required to be Well Capitalized Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent) Capital Required for Capital Adequacy to Risk Weighted Assets Carrying Value [Member] Carrying Amount [Member] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total cash and cash equivalents CASH AND CASH EQUIVALENTS, end of year CASH AND CASH EQUIVALENTS, beginning of year Cash Cash and Cash Equivalents, at Carrying Value Cash and due from banks Cash and Due from Banks NONCASH INVESTING AND FINANCING ACTIVITIES Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Cash surrender value of life insurance Cash Surrender Value of Life Insurance Reclassification from nonaccretable Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Table] Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Table] Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] Nonaccretable difference Certain Loans Acquired in Transfer, Nonaccretable Difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block] Accretable yield, end of period Accretable yield, beginning of period Accretable yield Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] Expected cash flows at acquisition Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table] Reclassification to accretable Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications (to) from Nonaccretable Difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Fair value of purchased credit impaired loans Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired, at Acquisition, at Fair Value Other changes, net Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) Accretion income Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion Additions Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions Basis in PCI loans at acquisition-estimated fair value Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value Contractual principal and interest at acquisition Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition Accretable yield Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Carrying amount, net of allowance Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Certain Loans Acquired In Transfer Not Accounted Total loans Allowance for loan losses Less: Allowance for loan losses Less: Allowance for loan losses Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses Contractual principal and interest at acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition Expected cash flows at acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Class of Stock [Line Items] Class of Stock [Line Items] Class of Stock [Domain] Class of Stock [Domain] Collateral Pledged [Member] Collateral Pledged [Member] Collateral [Axis] Collateral [Axis] Collateral [Domain] Collateral [Domain] Commercial and Industrial [Member] Commercial Portfolio Segment [Member] Commercial Real Estate [Member] Commercial Real Estate [Member] Commercial Real Estate [Member] Commercial Real Estate Portfolio Segment [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Common Stock [Member] Common Stock [Member] Common stock, shares authorized Common stock, shares authorized (in shares) Common stock, par value (in dollars per share) Common stock, par value (in dollars per share) Common stock, shares issued Common stock, shares issued (in shares) Common stock, shares outstanding Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Common stock - $1 par value; 40,000,000 shares authorized; 11,152,561 and 5,896,033 shares issued and outstanding in 2017 and 2016, respectively Common stock - $1 par value; 40,000,000 shares authorized; 12,704,581 and 11,152,561 shares issued and outstanding in 2018 and 2017, respectively Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk Disclosure [Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration risk (as a percent) Concentration Risk, Percentage Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration Risk [Table] Concentration Risk [Table] Condensed Parent Information Condensed Financial Information of Parent Company Only Disclosure [Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Construction in progress Construction in Progress, Gross Consumer and Other [Member] Consumer Portfolio Segment [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Credit Loss Status [Domain] Credit Loss Status [Domain] Credit Loss Status [Axis] Credit Loss Status [Axis] State Current State and Local Tax Expense (Benefit) Current tax expense Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) Customer Concentration Risk [Member] Customer Concentration Risk [Member] Doubtful [Member] Doubtful [Member] Restricted securities Debt Securities, Available-for-sale, Restricted 12 Months or Greater, Gross Unrealized Losses Available-for-sale, gross unrealized losses, 12 months or greater Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale, fair value, less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Loss from redemption of securities Debt Securities, Available-for-sale, Realized Loss Gain on sale of securities Loss on sale of securities Available-for-sale, fair value, 12 months or greater Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Proceeds from sale of available-for-sale securities Debt Securities, Available-for-sale, Gain (Loss) Less than 12 Months, Gross Unrealized Losses Available-for-sale, gross unrealized losses, less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Number of positions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Securities available for sale Debt Securities, Available-for-sale, Unrealized Loss Position Total, Gross Unrealized Losses Available-for-sale, gross unrealized losses, total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Disclosure [Abstract] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Deferred tax expense from stock options exercised Deferred Tax Expense from Stock Options Exercised Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Deferred compensation arrangements, overall, description Deferred Compensation Arrangements, Overall, Description Fair value adjustments Deferred Other Tax Expense (Benefit) Net deferred tax asset Deferred Tax Assets, Net Deferred tax assets: Deferred Tax Assets, Net [Abstract] State net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards, State and Local Total deferred tax assets Deferred Tax Assets, Gross Other Deferred Tax Assets, Other Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Total deferred tax liabilities Deferred Tax Liabilities, Net Other Deferred Tax Liabilities, Other Core deposit intangible Deferred Tax Liabilities, Intangible Assets Employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer matching contribution, percent of employees gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan [Abstract] Defined contribution plan, cost recognized Defined Contribution Plan, Cost Interest-bearing demand deposits Interest-bearing demand deposits Demand Deposit Accounts Deposit liabilities reclassified as loans receivable Deposit Liabilities Reclassified as Loans Receivable Total deposits Deposits Deposits Money market and savings deposits Deposits, Savings Deposits Deposits: Deposits [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Depreciation expense Depreciation Incremental shares from assumed conversions: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Director [Member] Director [Member] Dividends on preferred stock Cash dividends on preferred stock Dividends, Preferred Stock Dividends Dividends Dividends payable Dividends Payable Earnings Per Share Earnings Per Share [Text Block] Basic (in dollars per share) Basic earnings per share (in dollars per share) Basic earnings per common share (in dollars per share) Earnings Per Common Share Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Basic earnings per share computation: Earnings Per Share, Basic [Abstract] Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Diluted earnings per common share (in dollars per share) Diluted earnings per share computation: Earnings Per Share, Diluted [Abstract] EARNINGS PER COMMON SHARE Earnings Per Share [Abstract] Unrecognized compensation costs, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Stock Options [Member] Employee Stock Option [Member] Unrecognized compensation costs Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Equity Component [Domain] Equity Component [Domain] Ownership interest (as a percent) Equity Method Investment, Ownership Percentage Investment in subsidiaries Equity Method Investments Estimated Fair Value [Member] Estimate of Fair Value Measurement [Member] Fair Value Disclosures [Abstract] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value by Shareholders' Equity Class [Domain] Fair Value by Shareholders' Equity Class [Domain] Fair Value, Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value of Assets and Liabilities Fair Value Disclosures [Text Block] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Non-Recurring Basis Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Fair Value, Inputs, Level 3 [Member] Level 3 [Member] Significant Other Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 1 [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Significant Other Observable Inputs (Level 2) [Member] Level 2 [Member] Securities sold under agreements to repurchase Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 2018 Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling Twelve Months 2022 Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Five Depository insurance Federal Deposit Insurance Corporation Premium Expense Federal Home Loan Bank borrowings, fair value Federal Home Loan Bank advances and other borrowings Federal Home Loan Bank Advances [Member] Federal Home Loan Bank Advances [Member] Securities sold under agreement to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] Federal funds sold Federal funds sold Federal Funds Sold Federal funds purchased Federal Funds Purchased Federal Home Loan Bank, advances, interest rate (as a percent) Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate Federal Home Loan Bank Advances and Other Borrowings Federal Home Loan Bank Advances, Disclosure [Text Block] Long-term Federal Home Loan Bank Advances Long-term Federal Home Loan Bank Advances Foreclosed Assets Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block] Purchased Credit Impaired Loans [Member] Financial Asset Acquired with Credit Deterioration [Member] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Recorded investment, past due Financing Receivable, Recorded Investment, Past Due Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Number of loans modified as troubled debt restructurings with subsequent default Financing Receivable, Modifications, Subsequent Default, Number of Contracts Pre-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Past Due 90 Days or More and Accruing [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Number of Contracts Number of contracts Financing Receivable, Modifications, Number of Contracts Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Current Loans Financing Receivable, Recorded Investment, Current Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Post-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Troubled debt restructuring Loans that met criteria for restructured 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Total Finite-Lived Intangible Assets, Net Core deposit intangible, Gross Carrying Amount Finite-Lived Intangible Assets, Gross 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four Core deposit intangible, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-lived Intangible Assets Amortization Expense Finite-lived Intangible Assets Amortization Expense [Table Text Block] 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Foreclosed assets Sale of foreclosed assets and related expense Foreclosed assets Foreclosed assets Repossessed Assets Furniture, fixtures and equipment Furniture and Fixtures, Gross Furniture and Equipment [Member] Furniture and Fixtures [Member] Net losses (gains) from sale of foreclosed assets Net losses from sale of foreclosed assets Gains (Losses) on Sales of Other Real Estate Goodwill Goodwill Goodwill Change in goodwill due to acquisition Goodwill, Acquired During Period Fair value adjustment Goodwill, Purchase Accounting Adjustments Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Total impaired loans, Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Impaired loans with a valuation allowance, Unpaid Principal Balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Total impaired loans, Recorded Investment Impaired Financing Receivable, Recorded Investment Impaired loans without a valuation allowance, Interest Income Recognized Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method Total impaired loans, Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Impaired loans without a valuation allowance, Average Recorded Investment Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Impaired loans with a valuation allowance, Related Allowance Impaired Financing Receivable, Related Allowance Impaired Financing Receivables Impaired Financing Receivables [Table Text Block] Impaired loans without a valuation allowance, Recorded Investment Impaired Financing Receivable, with No Related Allowance, Recorded Investment Total impaired loans, Interest Income Recognized Impaired Financing Receivable, Interest Income, Cash Basis Method Impaired loans without a valuation allowance, Unpaid Principal Balance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Impaired loans with a valuation allowance, Interest Income Recognized Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method Impaired loans with a valuation allowance, Average Recorded Investment Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Impaired loans with a valuation allowance, Recorded Investment Impaired Financing Receivable, with Related Allowance, Recorded Investment Impairment of intangible assets Impairment of Intangible Assets, Finite-lived Income Tax Disclosure [Abstract] Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before equity in undistributed earnings of subsidiaries and income tax benefit Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income Statement [Abstract] Income tax expense Total income tax expense Income tax benefit Income Tax Expense (Benefit) Income Taxes Income Tax Disclosure [Text Block] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Federal income tax expense computed at the statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Nondeductible acquisition expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Change in tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Income Taxes Income Tax, Policy [Policy Text Block] State income taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Cash paid during the period for taxes Cash paid during the period for income taxes Net increase in deposits Increase (Decrease) in Deposits Accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Accrued interest payable Increase (Decrease) in Interest Payable, Net Net decrease in securities sold under agreements to repurchase Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net Changes in other assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other assets and liabilities Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Data processing Information Technology and Data Processing Interest and dividend income Interest and Dividend Income, Operating Securities and interest bearing deposits at other financial institutions Interest and Dividend Income, Securities, Operating Loans, including fees Interest and Fee Income, Loans and Leases INTEREST INCOME INCOME Interest and Dividend Income, Operating [Abstract] Securities and interest-bearing deposits at other financial institutions Interest and Fee Income, Other Loans INTEREST EXPENSE Interest Expense [Abstract] Total interest expense Interest expense Interest Expense Securities sold under agreements to repurchase Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Deposits Interest Expense, Deposits Net interest income before provision for loan losses Interest Income (Expense), Net Total interest income Interest income Interest Income, Operating Cash paid during the period for interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Interest-bearing deposits at other financial institutions Interest-bearing Deposits in Banks and Other Financial Institutions Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Dividends Investment Income, Dividend Restricted investments Investment Owned, at Fair Value Restricted investments, at cost Restricted investments Investment Owned, Restricted, Cost Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Investments, Debt and Equity Securities [Abstract] Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Salaries and employee benefits Labor and Related Expense Land and land improvements Land Lease expense under the leases Operating Leases, Rent Expense LIABILITIES AND STOCKHOLDERS' EQUITY LIABILITIES AND STOCKHOLDERS' EQUITY LIABILITIES AND SHAREHOLDERS' EQUITY Total liabilities Liabilities Total liabilities and shareholders' equity Liabilities and Equity Liabilities: Liabilities [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Long-term line of credit Long-term Line of Credit Standby letter of credit term, or less Line of Credit Facility, Expiration Period Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pre-approved unused lines of credit with related parties Line of Credit Facility, Remaining Borrowing Capacity Interest rate at period end (as a percent) Line of Credit Facility, Interest Rate at Period End Loan Restructuring Modification Name [Domain] Loan Restructuring Modification Name [Domain] Loan Restructuring Modification Name [Axis] Loan Restructuring Modification Name [Axis] Allowance for Loan Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Allowance for loan losses (in dollars) Less: Allowance for loan losses Allowance for loan losses Beginning balance Ending balance Loans and Leases Receivable, Allowance Repayments Loans and Leases Receivable, Related Parties, Proceeds Loans, net of allowance for loan losses of $5,860,291 in 2017 and $5,105,255 in 2016 Loans, net Loans, net of allowance for loan losses of $7,073,937 at June 30, 2018 and $5,860,291 at December 31, 2017 Loans Loans and Leases Receivable, Valuation, Policy [Policy Text Block] Troubled Debt Restructurings Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block] Total loans Total loans Loans and Leases Receivable, Net of Deferred Income Loans and Leases Receivable, Related Parties [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Balance, beginning of year Balance, end of year Loans and Leases Receivable, Related Parties Disbursements Loans and Leases Receivable, Related Parties, Additions Loans, net Loans Receivable, Fair Value Disclosure Loans and Allowance for Loan Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Termination fee Loss on Contract Termination for Default Securities Marketable Securities, Policy [Policy Text Block] Debt securities available-for-sale: Marketable Securities [Abstract] Mortgage loans in process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Mortgage-backed securities (GSEs) [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Mortgage-backed securities [Member] Collateralized Mortgage Backed Securities [Member] Impaired Loans [Member] Nonperforming Financial Instruments [Member] CASH FLOWS FROM FINANCING ACTIVITIES, net of acquisitions CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net income available to common stockholders Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM INVESTING ACTIVITIES, net of acquisitions CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net income available to common shareholders Net income available to common stockholders Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Net income Net income Net income Net income available to common shareholders Recently Issued Not Yet Effective Accounting Pronouncements Accounting Changes and Recently Issued Accounting Pronouncements Total noninterest expenses Noninterest Expense Total noninterest income Noninterest Income NONINTEREST EXPENSES Noninterest Expense [Abstract] Other noninterest income Noninterest Income, Other Noninterest-bearing demand deposits Noninterest-bearing demand deposits Noninterest-bearing Deposit Liabilities NONINTEREST INCOME Noninterest Income [Abstract] Loan portfolio segments Number of Reportable Segments 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months EXPENSES Operating Expenses [Abstract] Other operating expenses Expenses Operating Expenses 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2019 Operating Leases, Future Minimum Payments, Due in Two Years Presentation of Financial Information Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Other Commitments Other Commitments [Table Text Block] Reclassification adjustment for gains included in net income, tax expense Reclassification adjustment for losses included in net income, tax expense Reclassification adjustment for gains included in net income, net of tax expense of $54,533 and $76,422 in 2017 and 2016, respectively Reclassification adjustment for losses included in net income, net of tax (benefit) of $(280) and $0 in 2018 and 2017, respectively Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other comprehensive gain Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Total other comprehensive (loss) income Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Goodwill and core deposit intangible, net Other Intangible Assets, Net Other borrowings Other Borrowings Other assets Other Assets Unrealized holding gains (losses) arising during the year, net of tax expense (benefit) of $55,405 and $(326,697) in 2017 and 2016, respectively Unrealized holding gains (losses) on securities arising during the period, net of tax (benefit) expense of $(134,439), $(580,433), $468,293 and $270,461 in 2018 and 2017, respectively Other Debt Securities [Member] Other debt securities [Member] Unrealized holding losses arising during the year, tax benefit Unrealized holding gains arising during the period, tax expense (benefit) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Accrued expenses and other liabilities Accrued expenses and other liabilities Other liabilities Other Liabilities, Current Other operating expenses Other Noninterest Expense Other Other Tax Expense (Benefit) Other comprehensive loss, net of tax: Other comprehensive (loss) income, net of tax: Prime Rate [Member] Prime Rate [Member] Performing [Member] Performing Financial Instruments [Member] Past Due Financing Receivables Past Due Financing Receivables [Table Text Block] Pass [Member] Pass [Member] Parent [Member] Parent [Member] Net cash and cash equivalents received (paid) in business combination Payments to Acquire Business Two, Net of Cash Acquired Loan originations and principal collections, net Payments for (Proceeds from) Loans Receivable Payments for redemption of preferred stock Payments for Repurchase of Redeemable Preferred Stock Purchase of bank owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Purchase of securities available for sale Payments to Acquire Available-for-sale Securities Total consideration in cash Total consideration in cash Cash consideration paid Net cash and cash equivalents paid in business combinations Payments to Acquire Businesses, Net of Cash Acquired Capital injection in subsidiary Payments of Distributions to Affiliates Payment of dividends on preferred stock Payment of dividends on preferred stock Payment of dividends on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Net cash for purchase of Capstone Bancshares, Inc. Payments to Acquire Businesses and Interest in Affiliates Purchase (redemption) of restricted investments Purchase of restricted investments Payments to Acquire Restricted Investments Purchase of bank premises and equipment Payments to Acquire Property, Plant, and Equipment Purchase of securities Payments to Acquire Marketable Securities Employee Benefit Plan Pension and Other Postretirement Plans, Policy [Policy Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Preferred stock dividends Preferred stock dividend requirements Preferred Stock Dividends, Income Statement Impact Preferred Stock [Member] Preferred Stock [Member] Preferred stock, dividend rate (as a percent) Preferred Stock, Dividend Rate, Percentage Preferred Stock, Par value (in dollars per share) Preferred stock, par value (in dollars per share) Preferred stock, shares authorized Preferred stock, shares authorized (in shares) Preferred stock, shares issued Preferred stock, shares issued Preferred stock, shares issued (in shares) Preferred stock - $1 par value; 2,000,000 shares authorized; None issued and outstanding as of December 31, 2017; 12,000 issued and outstanding in 2016 Preferred stock - $1 par value; 2,000,000 shares authorized; None issued and outstanding as of June 30,2018 and December 31,2017 Preferred stock, shares outstanding Preferred stock, shares outstanding (in shares) Reclassifications Reclassification, Policy [Policy Text Block] Pro Forma [Member] Pro Forma [Member] Proceeds from Federal Home Loan Bank advances and other borrowings Proceeds from (Payments for) Other Financing Activities Redemption of preferred stock Proceeds from (Repurchase of) Redeemable Preferred Stock Cash received during the period from tax refunds Proceeds from Income Tax Refunds Issuance of common stock Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Proceeds from security sales, maturities, and paydowns Proceeds from Sale and Maturity of Marketable Securities Proceeds from issuance of note payable Proceeds from Notes Payable Proceeds from sales, maturities, and paydowns of securities available-for-sale Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Proceeds from sale of foreclosed assets Proceeds from Sale of Foreclosed Assets Purchase (redemption) of restricted investments Proceeds from Sale of Restricted Investments Proceeds Proceeds from Sale of Available-for-sale Securities Proceeds from stock options exercised Proceeds from Stock Options Exercised Professional services Professional Fees Service contracts Professional and Contract Services Expense Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Useful life Property, Plant and Equipment, Useful Life Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Abstract] Total, gross Property, Plant and Equipment, Gross Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Bank premises and equipment, net Total, net Property, Plant and Equipment, Net Provision (reallocation) charged to operating expense Provision for loan losses Provision (reallocation) charged to expense Acquisition of real estate through foreclosure SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Acquisition Through Foreclosure Receivables [Abstract] Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Related Party Transactions [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related party deposit liabilities Related Party Deposit Liabilities Related Party [Domain] Related Party [Domain] Related Party [Axis] Related Party [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Repayment of note payable Repayments of Notes Payable Securities Sold Under Agreements to Repurchase Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Residential Real Estate [Member] Residential Real Estate [Member] Mortgage Backed Securities [Member] Mortgage-backed securities [Member] Mortgage-backed securities (GSEs) [Member] Consumer Real Estate [Member] Residential Portfolio Segment [Member] Restricted Stock [Member] Restricted Stock [Member] Restricted stock compensation expense Restricted Stock or Unit Expense Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Retained Earnings [Member] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Risks and Uncertainties [Abstract] Substandard [Member] Substandard [Member] Shareholders' Equity Class [Axis] Shareholders' Equity Class [Axis] Number of Shares, Nonvested, ending balance Number of Shares, Nonvested, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Weighted Average Grant-Date Fair Value, Forfeited/expired (in dollars per share) Options vested in period, fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Number of Shares, Forfeited/expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Options Outstanding, Weighted Average Remaining Life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Number of Shares, Vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Weighted Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Options, exercisable, intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Weighted Average Grant-Date Fair Value, Nonvested, ending balance (in dollars per share) Weighted Average Grant-Date Fair Value, Nonvested, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price Term of options, no more than Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Options Outstanding, Weighted Average Exercise Price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Options Exercisable, Weighted Average Exercise Price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Weighted Average Grant-Date Fair Value, Vested (in dollars per share) Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Exercise price, not less than (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Price per share (in dollars per share) Sale of Stock, Price Per Share Number of shares sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Unrealized Loss on Investments Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of Intangible Assets and Goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted