Receivables [Abstract] Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Past Due Financing Receivables Financing Receivable, Past Due [Table Text Block] Schedule of Risk Categories of Loans by Class of Loans Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of Changes in Accretable Yield on PCI Loans Contractually Required Principal And Interest Cash Payments Changes [Table Text Block] Tabular disclosure of the components of contractual total changes in contractually required principal and interest cash payments. Schedule of Impaired Financing Receivables, Excluding PCI Loans and Valuation Allowance Impaired Financing Receivables [Table Text Block] Income Tax Disclosure [Abstract] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of Income Tax Examinations Summary of Income Tax Examinations [Table Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Gulf Shore Banc shares Inc Gulf Shore Banc shares Inc [Member] NorthStar Bank NorthStar Bank [Member] Palm Beach Community Bank Palm Beach Community Bank [Member] First Green Bancorp, Inc. First Green Bancorp, Inc. [Member] First Green Bancorp, Inc. [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Single family residential real estate Single Family Residential Real Estate [Member] Construction/development/land Construction Development Land [Member] Consumer and other loans Consumer And Other Loans [Member] PCI Loans Purchased Credit Impaired [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Commercial real estate Commercial Real Estate [Member] Commercial loans Commercial Loan [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Book Balance Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Fair Value Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value Allowance for Loan Losses Allowance for Credit Losses [Text Block] Leases [Abstract] Lease Commitments Lessee, Operating Leases [Text Block] Contractually required principal and interest Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance Non-accretable difference Certain Loans Acquired in Transfer, Nonaccretable Difference Cash flows expected to be collected Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Accretable yield Certain Loans Acquired in Transfer, Accretable Yield Total purchased credit-impaired loan acquired Share-based Payment Arrangement [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Stock Restricted Stock [Member] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Weighted-average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Fair value of awards vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Fair Value Disclosures [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Quoted Prices in Active Markets for Identical Assets Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs Fair Value, Inputs, Level 2 [Member] Significant Other Unobservable Inputs 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] Financial Assets Assets, Fair Value Disclosure [Abstract] Debt securities held to maturity Debt Securities, Held-to-maturity Time deposits with other banks Deposits with Other Federal Home Loan Banks Loans, net Loans and Leases Receivable, Net Amount Financial Liabilities Liabilities, Fair Value Disclosure [Abstract] Deposits Deposits, Fair Value Disclosure Federal Home Loan Bank (FHLB) borrowings Federal Home Loan Bank Borrowings, Fair Value Disclosure Subordinated debt Subordinated Debt Obligations, Fair Value Disclosure Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Real Estate Residential Portfolio Segment [Member] Commercial and financial Commercial Portfolio Segment [Member] Consumer Consumer Portfolio Segment [Member] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Construction and land development Construction Permits [Member] Residential real estate Residential Real Estate [Member] Commercial and financial Commercial and Financial [Member] Consumer Consumer Loan [Member] Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Troubled Debt Restructuring [Line Items] Recorded Investment Impaired Financing Receivable, Recorded Investment [Abstract] Impaired Loans with No Related Allowance Recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Impaired Loans with an Allowance Recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Total Impaired Loans Impaired Financing Receivable, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance [Abstract] Impaired Loans with No Related Allowance Recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Impaired Loans with an Allowance Recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Total Impaired Loans Impaired Financing Receivable, Unpaid Principal Balance Related Valuation Allowance Impaired Financing Receivable, Related Allowance Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Condensed Financial Information Disclosure [Abstract] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Company Parent Company [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Income Noninterest Income [Abstract] Interest/other Other Nonoperating Income Dividends from subsidiary Bank Subsidiary or Equity Method Investee, Noncontrolling Interest in Income of Subsidiary Gain on sale of Visa stock Debt and Equity Securities, Gain (Loss) Total Interest Income Interest and Dividend Income, Operating Interest expense Interest Expense Other expenses Other Noninterest Expense (Loss) income before income taxes and equity in undistributed income of subsidiaries Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax (benefit) provision Income Tax Expense (Benefit) (Loss) Income before equity in undistributed income of subsidiaries Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Equity in undistributed income of subsidiaries Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Net Income Net Income (Loss) Attributable to Parent Schedule of Supplemental Lease Cost Information Related to Operating Leases Lease, Cost [Table Text Block] Schedule of Supplemental Balance Sheet Information Related to Operating Leases Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Schedule of Maturities of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Statement of Cash Flows [Abstract] Cash Flows From Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net Income Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Amortization of premiums and discounts on securities, net Accretion (Amortization) of Discounts and Premiums, Investments Amortization of operating lease right-of-use assets Operating Lease, Right-Of-Use Asset, Amortization Operating Lease, Right-Of-Use Asset, Amortization Other amortization and accretion, net Other Accretion (Amortization), Net Other Accretion (Amortization), Net Stock based compensation Share-based Payment Arrangement, Noncash Expense Origination of loans designated for sale Payments for Origination of Mortgage Loans Held-for-sale Sale of loans designated for sale Sale Of Loans Designated Held For Sale Sale of loans designated held for sale. Provision for loan losses Provision for Loan, Lease, and Other Losses Deferred income taxes Deferred Income Tax Expense (Benefit) (Gains) losses on sale of securities Marketable Securities, Realized Gain (Loss), Excluding Other-than-temporary Impairment Loss Gain on sale of VISA Class B stock Gains on sale of loans Gain (Loss) on Sales of Consumer Loans Gains on sale and write-downs of other real estate owned Gains (Losses) on Sales of Other Real Estate Losses on disposition of fixed assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Bank owned life insurance death benefits Bank Owned Life Insurance Benefits Bank Owned Life Insurance Benefits Changes in operating assets and liabilities, net of effects from acquired companies: Increase (Decrease) in Operating Capital [Abstract] Net (increase) decrease in other assets Increase (Decrease) in Other Operating Assets Net (decrease) increase in other liabilities Increase (Decrease) in Other Operating Liabilities 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] Maturities and repayments of debt securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Maturities and repayments of debt securities held-to-maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from sale of debt securities available-for-sale Proceeds from Sale of Debt Securities, Available-for-sale Purchases of debt securities available-for-sale Payments to Acquire Debt Securities, Available-for-sale Purchases of debt securities held-to-maturity Payments to Acquire Held-to-maturity Securities Maturities of time deposits with other banks Proceeds from Sale and Maturity of Held-to-maturity Securities Net new loans and principal repayments Payments for (Proceeds from) Other Loans and Leases Proceeds from the sale of portfolio loans Proceeds from Sale of Loans Held-for-investment Purchases of loans held for investment Payments to Acquire Loans Held-for-investment Proceeds from the sale of other real estate owned Proceeds from Sale of Foreclosed Assets Proceeds from sale of FHLB and Federal Reserve Bank Stock Proceeds from Sale of Federal Reserve Bank Stock Purchase of FHLB and Federal Reserve Bank Stock Payments to Acquire Federal Reserve Bank Stock Purchase of Visa Class B stock Payments to Acquire Marketable Securities Proceeds from sale of Visa Class B stock Proceeds From Sale Of Marketable Securities Proceeds From Sale Of Marketable Securities Redemption of bank owned life insurance Proceeds from Life Insurance Policy Purchase of bank owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Net cash from bank acquisitions Net Cash From Acquition Net of Paid For Prefrred Stock The net cash flow associated with the acquisition of business during the period and paid for preferred stock. Additions to bank premises and equipment Additions To Bank Premises And Equipment Additions to bank premises and equipment. Net Cash Used in 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 (decrease) in deposits Increase (Decrease) in Deposits Net (decrease) increase in federal funds purchased and repurchase agreements Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net Net (decrease) increase in FHLB borrowings with original maturities of three months or less Increase (Decrease) in Loans from Federal Home Loan Banks Repayments of FHLB borrowings with original maturities of more than three months Repayments Of Loans, Federal Home Loan Banks, Maturities Greater Than Three Months Repayments Of Loans, Federal Home Loan Banks, Maturities Greater Than Three Months Proceeds from FHLB borrowings with original maturities of more than three months Increase (Decrease) in Loans from Federal Home Loan Banks, Maturities Greater Than Three Months Increase (Decrease) in Loans from Federal Home Loan Banks, Maturities Greater Than Three Months Stock based employee benefit plans Payment, Tax Withholding, Share-based Payment Arrangement Stock based employee benefit plans Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Issuance of common stock, net of related expense Proceeds from Issuance of Common Stock Dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Net Cash Provided by Financing Activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and Cash Equivalents at End of Year Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid during the period for taxes Income Taxes Paid, Net New operating lease right-of-use assets Operating Lease, Right-Of-Use Assets, Initial Recognition Operating Lease, Right-Of-Use Assets, Initial Recognition New operating lease liabilities Operating Lease, Liability, Initial Recognition Operating Lease, Liability, Initial Recognition Supplemental disclosure of non cash investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Transfer of debt securities from held-to-maturity to available-for-sale Transfer Of Debt Securities, From Held-To-Maturity To Available For Sale Transfer Of Debt Securities, From Held-To-Maturity To Available For Sale Transfer from loans to other real estate owned Transfer From Loans To Other Real Estate Owned Transfer from loans to other real estate owned. Transfer from bank premises to other real estate owned Transfers From Bank Premises To Other Real Estate Owned The amount of transfers from bank premises to other real estate owned. Transfer from loans held for investment to loans held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Premises Premises [Member] Furniture and Equipment Furniture and Fixtures [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Cost Property, Plant and Equipment, Gross Accumulated Depreciation & Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net Carrying Value Property, Plant and Equipment, Net Land Land Investments, Debt and Equity Securities [Abstract] Summary of Amortized Cost and Fair Value of Securities Available for Sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Summary of Amortized Cost and Fair Value of Securities Held to Maturity Debt Securities, Held-to-maturity [Table Text Block] Summary of Investments Classified by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Unrealized Loss and Fair Value on Investments Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Equity in undistributed income of subsidiaries Gain on sale of Visa Class B stock Net increase (decrease) in other liabilities Net cash paid for bank acquisition Payments to Acquire Businesses, Net of Cash Acquired Investment in unconsolidated subsidiary Payments to Acquire Interest in Subsidiaries and Affiliates Purchase of Visa Class B stock Proceeds from sale of Visa Class B stock Proceeds from Sale and Maturity of Marketable Securities Dividends from bank subsidiary Proceeds From Dividends Received, Investing Activities Proceeds From Dividends Received, Investing Activities (Increase) decrease in securities purchased under agreement to resell, maturing within 30 days, net Proceeds from Sale and Maturity of Debt Securities, Available-for-sale Stock based employment benefit plans Employee Benefits and Share-based Compensation Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total income tax provision Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Other debt obligations Other Debt Obligations [Member] Mortgage-backed securities and collateralized mortgage obligations of U.S. government sponsored entities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Private mortgage-backed securities and collateralized mortgage obligations Mortgage-backed Securities, Issued by Private Enterprises [Member] Collateralized loan obligations Collateralized Loan Obligations [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Debt Securities, Held-to-maturity, Maturity [Abstract] Debt Securities, Held-to-maturity, Maturity [Abstract] Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] Held to maturity, amortized cost, due in less than one year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Held to maturity, amortized cost, due after one year through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Held to maturity, amortized cost, due after five years through ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Held to maturity, amortized cost, due after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost Held to maturity, amortized cost, total Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] Held to maturity, fair value, due in less than one year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Held to maturity, fair value, due after one year through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Held to maturity, fair value, due after five years through ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Held to maturity, fair value, due after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Held to maturity, fair value, total Debt Securities, Held-to-maturity, Fair Value Available-for-sale Securities, Debt Maturities [Abstract] Available-for-sale Securities, Debt Maturities [Abstract] Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Available for sale, amortized cost, due in less than one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Available for sale, amortized cost, due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Available for sale, amortized cost, due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Available for sale, amortized cost, due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Available for sale, amortized cost, total Debt Securities, Available-for-sale, Amortized Cost Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Available for sale, fair value, due in less than one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Available for sale, fair value, due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Available for sale, fair value, due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Available for sale, fair value, due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Available for sale, fair value, total Debt Securities, Available-for-sale ESPP Employee Stock [Member] Weighted-average employee purchase price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] PCI Loans Purchased Credit Impaired Loans [Member] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Recorded Investment Loans and Leases Receivable, Net Amount [Abstract] Individually Evaluated for Impairment Financing Receivable, Individually Evaluated for Impairment Collectively Evaluated for Impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Total Loans and Leases Receivable, Net of Deferred Income Associated Allowance Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Individually Evaluated for Impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Collectively Evaluated for Impairment Financing Receivable, Collectively Evaluated for Impairment Total Financing Receivable, Allowance for Credit Loss Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total undiscounted cash flows Lessee, Operating Lease, Liability, Payments, Due Less: Net present value adjustment Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total Operating Lease, Liability Equity [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Seacoast National Bank (A Wholly Owned Bank Subsidiary) Subsidiaries [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Total Risk-Based Capital Ratio (to risk-weighted assets), Amount Capital Tier 1 Capital (to risk-weighted assets), Amount Tier One Risk Based Capital Common Equity Tier 1 Capital (to risk-weighted assets), Amount Common Equity Tier One Leverage Capital Common equity capital as defined in the regulations. Also called Core Capital. Leverage (to adjusted average assets), Amount Tier One Leverage Capital Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio Capital to Risk Weighted Assets Tier 1 Capital (to risk-weighted assets), Ratio Tier One Risk Based Capital to Risk Weighted Assets Common Equity Tier 1 Capital (to risk-weighted assets), Ratio Common Equity Tier One Risk Based Capital To Risk Weighted Assets Common equity tier 1 capital divided by risk weighted assets as defined by regulations. Leverage (to adjusted average assets), Ratio Tier One Leverage Capital to Average Assets Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount Capital Required for Capital Adequacy Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount Tier One Risk Based Capital Required for Capital Adequacy Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount Common Equity Tier One Risk Based Capital Required For Capital Adequacy The minimum amount of Tier 1 Risk Based common equity capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount Tier One Leverage Capital Required for Capital Adequacy Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets The minimum Tier common equity Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount Capital Required to be Well Capitalized Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount Tier One Risk Based Capital Required to be Well Capitalized Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount Common Equity Tier One Risk Based Capital Required To Be Well Capitalized The amount of Tier 1 Risk Based Common Equity Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount Tier One Leverage Capital Required to be Well Capitalized Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets The Tier 1 capital ratio (Tier 1 common equity capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] As Adjusted Restatement Adjustment [Member] Number of branches acquired Business Acquisition, Number Of Branches Business Acquisition, Number Of Branches Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Loans, net Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loan Held For Sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loan Held For Sale. Deposits acquired Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Deposits Amount of deposits due after one year or the normal operating cycle, if longer, assumed at the acquisition date. Percentage of common stock acquired Business Acquisition, Percentage of Voting Interests Acquired Cash portion, cash per share for common stock converted (in dollars per share) Business Combination, Consideration Transferred, Cash Paid Per Acquiree Share Business Combination, Consideration Transferred, Cash Paid Per Acquiree Share Common stock portion, number of Seacoast stock for each share of stock converted (in shares) Business Acquisition Per Share Exchange Ratio per share exchange ratio. Multiplied by common stock price per share (in dollars per share) Business Acquisition, Share Price Goodwill, nondeductible for tax purposes Goodwill Acquisition costs Business Combination, Acquisition Related Costs Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] U.S. Treasury securities and obligations of U.S. government agencies US Treasury and Government [Member] Obligations of state and political subdivisions US States and Political Subdivisions Debt Securities [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Stock Option Share-based Payment Arrangement, Option [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2013 Plan Two Thousand Thirteen Plan [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Defined contribution plan charges to operations Defined Contribution Plan, Cost Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Maximum term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Number of shares authorized for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Remaining shares authorized for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Target award percentage Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Unit Percentage Of Grantee Earning Share based compensation arrangement by share based payment award restricted stock unit percentage of grantee earning. Number of shares authorized for repurchase (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Percent of fair market value that employees may purchase shares Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Other Real Estate Owned Other Real Estate Owned [Member] Average capitalization rate Capitalization Rates Utilized To Determine Fair Value Of Underlying Collateral Averaged Percentage Represents capitalization rates utilized to determine fair value of the underlying collateral averaged percentage. Fair value of impaired loans Loans Receivable, Fair Value Disclosure Specific reserve for impaired loans Loans and Leases Receivable, Allowance Other real estate owned and other reductions classified as level 3 transfers in Other Real Estate Owned And Other Reductions Classified As Level Three Transfers In Other real estate owned and other reductions classified as level three transfers in. Paydowns, chargeoffs and writedowns of level 3 Other Real Estate Owned And Other Reductions Other real estate owned and other reductions. Additions to level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Sales of level 3 investments Other Real Estate, Disposals Securities or Other Assets Sold under Agreements to Repurchase [Axis] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Assets Sold under Agreements to Repurchase, Type [Domain] Assets Sold under Agreements to Repurchase, Type [Domain] Loans Loans [Member] The Bank Shares Inc The Bank shares Inc [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] PULs Purchased Unimpaired Loans [Member] Remaining fair value adjustment for loans acquired Assets, Fair Value Adjustment Percentage of fair value adjustment for loans acquired Fair value adjustment Percent The percentage of outstanding aggregate loan balances representing the fair value adjustments for loans acquired. Recapture of loan losses Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Goodwill and Intangible Assets Disclosure [Abstract] Goodwill [Roll Forward] Goodwill [Roll Forward] Beginning of year Changes from business combinations Goodwill, Acquired During Period Total Commitments and Contingencies Disclosure [Abstract] Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Secured Credit Risk Secured Debt [Member] Secured Financial Standby Letter Of Credit Secured [Member] Fixed Interest Rate Credit Risk Interest Rate Lock Commitments [Member] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Commitment to extend credit amount Commitment To Extend Credit Amount Commitment to extend credit amount. Secured amount of commitment to extend credit Commitment To Extend Credit Secured Amount Commitment to extend credit secured amount. Commitments to extend credit Loans and Leases Receivable, Commitments, Fixed Rates Commitment to extend credit fixed interest rate Commitment To Extend Credit Fixed Interest Rate Commitment to extend credit amount. Collateral held for secured standby letters of credit Securities Received as Collateral Unfunded limited partner equity commitment Unfunded Limited Partner Equity Commitment Unfunded limited partner equity commitment. Debt Disclosure [Abstract] Borrowings Debt Disclosure [Text Block] Schedule of Share-Based Compensation Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of Unrecognized Compensation Cost, Nonvested Awards Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Schedule of Nonvested Share Activity Schedule of Nonvested Share Activity [Table Text Block] Schedule of Restricted Stock and Restricted Stock Units Activity Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of Stock Option Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Stock Options Roll Forward Schedule of Stock Options Roll Forward [Table Text Block] Schedule of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Options Outstanding and Remaining Contractual Life of Stock Options Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Schedule of Employee Stock Purchase Plan Activity Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Pass Pass [Member] Special Mention Special Mention [Member] Substandard Substandard [Member] Doubtful Doubtful [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Net Loans Financing Receivable, after Allowance for Credit Loss Brokers and Dealers [Abstract] Summary of Noninterest Income and Expense Non Interest Income And Expense [Table Text Block] Tabular disclosure for noninterest income and expense. Business Combinations Business Combination Disclosure [Text Block] Cash, Dividend and Loan Restrictions [Abstract] Cash, Dividend and Loan Restrictions Cash Dividend And Loan Restrictions [Text Block] Cash, dividend and loan restrictions. Shares excluded from computation of diluted EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Basic earnings per share Earnings Per Share, Basic [Abstract] Total weighted average common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Net income per share (in dollars per share) Earnings Per Share, Basic Diluted earnings per share Earnings Per Share, Diluted [Abstract] Add: Dilutive effect of employee restricted stock and stock options (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Total weighted average diluted stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Net income per share (in dollars per share) Earnings Per Share, Diluted Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Tax rate applied to income before income taxes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Increase (decrease) resulting from the effects of: Effective Income Tax Rate Reconciliation, Percent [Abstract] Tax law change Effective Income Tax Rate Reconciliation, Tax Law Changes, Amount Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to change in tax laws. Nondeductible acquisition costs Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount State income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Tax credit investments Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount Stock compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Federal tax provision Current Federal Tax Benefit Provision Before Valuation Allowance Current federal tax benefit before valuation allowance. State tax provision Current State And Local Tax Benefit Provision Before Valuation Allowance Current state and local tax benefit before valuation allowance. Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Net interest income Business Acquisition, Pro Forma Revenue Net income available to common shareholders Business Acquisition, Pro Forma Net Income (Loss) EPS - basic (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic EPS - diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Operating lease cost Operating Lease, Cost Variable lease cost Variable Lease, Cost Short-term lease cost Short-term Lease, Cost Sublease income Sublease Income Total lease cost Lease, Cost Average amount of reserve balances Average Reserve Balance Maintained With Federal Reserve Bank Average reserve balance maintained with federal reserve bank. Average balance reserve requirement Average Reserve Balance Required To Be Maintained With Federal Reserve Bank Average Reserve Balance Required To Be Maintained With Federal Reserve Bank Maximum amount of loans available for transfer Maximum Amount Available For Transfer Of Loans Maximum amount available for transfer of loans. Loans outstanding made to affiliates Due from Affiliates Allowance for Credit Losses on Financing Receivables Financing Receivable, Allowance for Credit Loss [Table Text Block] Loan Portfolio and Related Allowance Loan Portfolio And Related Allowance [Table Text Block] Tabular disclosure for loan portfolio and related allowance. Accounting Policies [Abstract] Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Required Regulatory Capital Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Operating lease liabilities Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Right-of-use assets obtained in exchange for new operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted average remaining lease term for operating leases Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate for operating leases Operating Lease, Weighted Average Discount Rate, Percent Income Statement [Abstract] Reclassification adjustment for securities gains (losses) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Debt Securities Available-for-Sale Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Available for sale, gross unrealized gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Available for sale, gross unrealized losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Available for sale, fair value Debt Securities Held-to-Maturity Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] Held to maturity, amortized cost Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment Held to maturity, gross unrealized gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Held to maturity, gross unreazlied losses Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Held to maturity, fair value 2020 amortization expense Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2021 amortization expense Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 amortization expense Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 amortization expense Finite-Lived Intangible Assets, Amortization Expense, Year Four 2024 amortization expense Finite-Lived Intangible Assets, Amortization Expense, Year Five Mortgage service rights retained from sale of SBA Mortgage Servicing Rights Mortgage Servicing Rights Stock options Equity Option [Member] Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options, outstanding at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Options, exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options, forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options, outstanding at end of period (in shares) Options, exercisable at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted-average exercise price at beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-average exercise price, granted (in dollars per share) Weighted-average exercise price, exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted-average exercise price, forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-average exercise price at end of period (in dollars per share) Weighted-average exercise price, exercisable at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-average remaining contractual term, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-average remaining contractual term, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Employee Benefits and Stock Compensation Pension and Other Postretirement Benefits Disclosure [Text Block] Federal Funds Purchased and Securities Sold Under Agreements to Repurchase Federal Funds Purchased And Securities Sold Under Agreements To Repurchase [Table Text Block] Federal funds purchased and securities sold under agreements to repurchase. Schedule of Collateral Type and Maturity Colleteral Securities Pledge Maturity [Table Text Block] The schedule of collateral securities pledge type and maturity. Schedule of Junior Subordinated Debentures and Related Trust Preferred and Common Equity Securities Schedule of Long-term Debt Instruments [Table Text Block] Fair Value, Assets Measured on Recurring and Nonrecurring Basis Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Schedule of Contractual Balance and Gains or Losses Schedule of contractual balance and gains or losses aggregate fair value [Table Text Block] Tabular disclosure of contractual balance and gains or losses (including accrued interest). Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] General General Description [Policy Text Block] General description. Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Time Deposits with Other Banks Time deposits with other banks [Policy Text Block] Disclosure of accounting policy for Time deposits with other banks. Securities Purchased and Sold Agreements Repurchase and Resale Agreements Policy [Policy Text Block] Securities Marketable Securities, Policy [Policy Text Block] Loans Financing Receivable [Policy Text Block] Derivatives Derivatives, Policy [Policy Text Block] Loan Commitments and Letters of Credit Loan Commitments, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Other Real Estate Owned Other Real Estate Owned [Policy Text Block] Other real estate owned. Bank Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Bank Owned Life Insurance (BOLI) Bank owned life insurance [Policy Text Block] Bank owned life insurance. Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Allowance for Loan Losses and Reserve for Unfunded Lending Commitments Allowance For Loan Losses And Reserve For Unfunded Lending Commitments [Policy Text Block] Allowance for loan losses and reserve for unfunded lending commitments. Income Taxes Income Tax, Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Recently Issued Accounting Standards, Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Summary of Bank Premises and Equipment Property, Plant and Equipment [Table Text Block] Summary of Financial Instruments with Off-Balance-Sheet Risk Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Acquired intangible assets consist of core deposit intangibles Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Gross Carrying Amount and Accumulated Amortization of Intangible Asset Schedule of Finite-Lived Intangible Assets [Table Text Block] Risk-free interest rates Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected lives (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Carrying Value CRA - Qualified Debt Securities CRA - Qualified Debt Securities [Member] CRA - Qualified Debt Securities [Member] United States Treasury Deposits and Other Public and Trust Deposits United States Treasury Deposits and Other Public and Trust Deposits [Member] Repurchase Agreement Repurchase Agreement [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class B Common Class B [Member] Common Class A Common Class A [Member] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Visa Visa [Member] Visa [Member] Gross gains from sale of securities Available-for-sale Securities, Gross Realized Gains Gross losses from sale of securities Available-for-sale Securities, Gross Realized Losses Fair value of securities pledged as collateral Security Owned and Pledged as Collateral, Fair Value Unrealized losses Fair value of mortgage backed securities of government sponsored entities Other assets of Federal Home Loan Bank and Federal Reserve Bank Federal Home Loan Bank Stock and Federal Reserve Bank Stock Other assets Other Assets Shares held (in shares) Common Stock, Shares, Outstanding Conversion rate of Class A stock for each share of Class B stock (in shares) Debt Instrument, Convertible, Conversion Price Shares of class A Visa stock issued (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Stock Purchase Plan Stock Purchase Plan [Member] Profit Sharing Plan Profit Sharing Plan [Member] Capital conservation buffer rate Capital Conservation Buffer Rate It represents the capital conservation buffer rate requisite the entity. Reserved common shares for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Shares issued from treasury stock (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued Summary of Purchase Price Calculation Schedule of summarizing the purchase price calculation [Table Text Block] Tabular disclosure of summarizing the purchase price calculation. Schedule of Business Acquisitions Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Fair Value of Acquired Loans and Unpaid Principal Balance Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Contractually Required Principal and Interest Payments Adjusted for Estimated Prepayments Schedule Of Contractually Required Principal And Interest Payments [Table Text Block] Tabular disclosure of the amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquire. Summary of Pro-Forma Data including Acquisition of Gulfshore, NSBC and PBCB Business Acquisition, Pro Forma Information [Table Text Block] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Portfolio Loans Portfolio Loans [Member] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Domain] Financial Asset, Period Past Due [Domain] Accruing 30-59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Accruing 60-89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Accruing Greater Than 90 Days Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Current Financing Receivable, Not Past Due Financing receivables past due Financing Receivable, Past Due Nonaccrual Financing Receivable, Nonaccrual Total financing receivables Noncontrolling Interest [Table] Noncontrolling Interest [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Service charges on deposit accounts Deposit Account [Member] Trust fees Fiduciary and Trust [Member] Mortgage banking fees Mortgage Banking [Member] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Noninterest Income Revenues Revenue from Contract with Customer, Excluding Assessed Tax Brokerage commissions and fees Brokerage Commissions Revenue Marine finance fees Marine Finance Revenues Marine Finance Revenues Interchange income Interchange Income Interchange income. BOLI income Bank Owned Life Insurance Income SBA gains Small Business Administration, Gains Small Business Administration, Gains Other Noninterest income others It Represent Non interest income other for the during Period. Noninterest Income Non Interest Income Excluding Gain Loss On Loans Sale And Investments Non interest income excluding gain loss on loans sale and investments. Securities gains (losses), net Gain (Loss) on Investments Total Noninterest Income Noninterest Income Noninterest Expenses Noninterest Expense [Abstract] Salaries and wages Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold Employee benefits Other Labor-related Expenses Outsourced data processing costs Information Technology and Data Processing Telephone and data lines Communication Occupancy Occupancy, Net Furniture and equipment Furniture And Equipment Expense Furniture and equipment expense. Marketing Marketing Expense Legal and professional fees Professional Fees FDIC assessments Federal Deposit Insurance Corporation Assessment Federal deposit insurance corporation assessment. Amortization of intangibles Amortization of Intangible Assets Foreclosed property expense and net loss (gain) on sale Gains (Losses) on Sales of Investment Real Estate Other Total Noninterest Expenses Noninterest Expense Initially Reported Previously Reported [Member] Period Adjustments [Axis] Period Adjustments [Axis] Period Adjustments [Domain] Period Adjustments [Domain] Measurement Period Adjustments Measurement Period Adjustment [Member] Assets: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Time deposits with other banks Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Investment securities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Investments. Fixed assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Fixed Assets Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Fixed Assets. Other real estate owned Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed other Real Estate Owned Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Bank owned Life insurance. Core deposit intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Goodwill Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total assets Liabilities: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Deposits Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Total liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Fair Value, Measurements, Nonrecurring Fair Value, Nonrecurring [Member] Securities available-for-sale (at fair value) Loans held for sale Loans Held-for-sale, Fair Value Disclosure Loans Other real estate owned Other Real Estate Equity securities Available-for-sale Securities, Equity Securities Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Accounting Changes and Error Corrections [Abstract] Recently Issued Accounting Standards, Not Adopted at December 31, 2019 New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Reduction in interest income Financing Receivable Recorded Investment Nonaccrual Status Reduction In Interest Income Financing receivable recorded investment nonaccrual status reduction in interest income. Loans to directors and executive officers Loans and Leases Receivable, Related Parties New loans offered Loans and Leases Receivable, Related Parties, Additions Number of loans modified in troubled debt restructurings Financing Receivable, Modifications, Number of Contracts Value of loans modified in troubled debt restructurings Financing Receivable, Troubled Debt Restructuring, Postmodification Payments for loans in default, number of payments Payments For Loans In Default, Number Of Payments Payments For Loans In Default, Number Of Payments Payments for loans in default Financing Receivable, Troubled Debt Restructuring, Subsequent Default Accruals for trouble debt restructurings Troubled Debt Restructuring Outstanding Troubled debt restructuring outstanding. Average amount for loans impaired Impaired Financing Receivable, Average Recorded Investment Interest income on impaired loans Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income Interest income related to impaired loans with impairment measured on present value of expected future cash flows Loans and Leases Receivable, Impaired, Interest Income Recognized, Change in Present Value Attributable to Passage of Time Noninterest Income and Expenses Non Interest Income [Text Block] The entire disclosure for noninterest income and expense. Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Unsecured Financial Standby Letter Of Credit Unsecured [Member] Contract or Notional Amount Contract Or Notional Amount [Abstract] Contract Or Notional Amount [Abstract] Commitments to extend credit Standby letters of credit and financial guarantees written Guarantor Obligations, Current Carrying Value Accounting Policies [Table] Accounting Policies [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Building Building [Member] Leasehold Improvements Leasehold Improvements [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Core Deposits Core Deposits [Member] Accounting Policies [Line Items] Accounting Policies [Line Items] Number of operating segments Number of Operating Segments Number of traditional bank offices Number Of Traditional Branch Offices Number Of Traditional Branch Offices Number of commercial banking centers Number Of Commercial Banking Centers Number Of Commercial Banking Centers Modified loan terms Modified Loan Terms Minimum Performing Period For Borrowers Modified loan terms minimum performing period for borrowers. Number of days past due Loan And Leases Due Period For Discontinuation Of Interest Accrual Loan and leases due period for discontinuation of interest accrual. Number of days past due, consumer loans Consumer Loans Charged Off Period Consumer loans charged off period. Bank premises and equipment, useful life Property, Plant and Equipment, Useful Life Operating lease right-of-use assets acquired Business Combination, Acquired Operating Lease, Right-Of-Use Asset Business Combination, Acquired Operating Lease, Right-Of-Use Asset Intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Commercial and financial Commercial And Financials [Member] Allowance for Loan Losses: Allowance for Loan and Lease Losses [Roll Forward] Beginning Balance Charge- Offs Allowance for Loan and Lease Losses, Write-offs TDR Allowance Adjustments Allowance for Loan and Lease Losses, Adjustments, Other Ending Balance Bank Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Net Income Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gains (losses) on securities available-for-sale Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Reclassification of unrealized losses on securities transferred to available-for-sale upon adoption of new accounting pronouncement Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax Amortization of unrealized losses on securities transferred to held-to-maturity, net Other Comprehensive Income (Loss), Transfers from Available-for-Sale to Held-to-maturity Securities, Before Tax Other Comprehensive Income (Loss), Transfers from Available-for-Sale to Held-to-maturity Securities, Before Tax Reclassification adjustment for (gains) losses included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax (Provision) benefit for income taxes Other Comprehensive Income (Loss), 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 Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest bearing deposits with other banks Interest-bearing Deposits in Banks and Other Financial Institutions Total Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value Time deposits with other banks Time Deposits With Other Banks Time Deposits With Other Banks Securities held-to-maturity (fair value $262,213 in 2019 and $349,895 in 2018) Total Debt Securities Investments Loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans Loans and Leases Receivable, Gross Less: Allowance for loan losses Loans, Net of Allowance for Loan Losses Bank premises and equipment, net Other real estate owned Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Bank owned life insurance Bank Owned Life Insurance Net deferred tax assets Deferred Income Tax Assets, Net Other assets Other Assets, Noncurrent Total Assets Assets Liabilities Liabilities [Abstract] Deposits Deposits [Abstract] Noninterest demand Noninterest-bearing Deposit Liabilities Interest-bearing demand Interest-bearing Deposit Liabilities Savings Deposits, Savings Deposits Money market Deposits, Money Market Deposits Other time deposits Time Deposits, Less than $100,000 Brokered time certificates Brokered Time Certificates Brokered time certificates. Time certificates of more than $250,000 Time Deposits, at or Above FDIC Insurance Limit Total Deposits Deposits Securities sold under agreements to repurchase, maturing within 30 days Securities Sold under Agreements to Repurchase Federal Home Loan Bank borrowings Federal Home Loan Bank, Consolidated Obligations Subordinated debt Subordinated Debt Other liabilities Other Liabilities, Noncurrent Total Liabilities Liabilities Commitments and Contingencies (Notes K and P) Commitments and Contingencies Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value $0.10 per share authorized 120,000,000 shares, issued 51,760,617 and outstanding 51,513,733 shares in 2019 and authorized 120,000,000 shares, issued 51,514,734 and outstanding 51,361,079 shares in 2018 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Less: Treasury stock (246,884 shares in 2019 and 153,655 shares in 2018), at cost Treasury Stock, Value TOTAL Shareholders' Equity Before Accumulated Other Comprehensive loss, net Stockholders Equity Before Accumulated Other Comprehensive Income Stockholders equity before accumulated other comprehensive income. Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Total Shareholders' Equity Stockholders' Equity Attributable to Parent Total Liabilities & Shareholders' Equity Liabilities and Equity Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] SBCF Capital Trust I Trust One [Member] SBCF Statutory Trust II Trust Second [Member] SBCF Statutory Trust III Trust Third [Member] BANKshares, Inc. Statutory Trust I BANKshares, Inc. Statutory Trust I [Member] BANKshares, Inc. Statutory Trust I [Member] BANKshares, Inc. Statutory Trust II BANKshares, Inc. Statutory Trust II [Member] BANKshares, Inc. Statutory Trust II [Member] BANKshares, Inc. Capital Trust I BANKshares, Inc. Capital Trust I [Member] BANKshares, Inc. Capital Trust I [Member] Grand Bank Capital Trust I Grand Bank Capital Trust I [Member] Grand Bank Capital Trust I [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Junior subordinated debt Long-term Debt, Gross Trust preferred securities Trust Preferred Securities Trust Preferred Securities Common equity securities Common Equity Securities Issued By Trust Common Equity Securities Issued By Trust Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Interest rate on junior subordinated loans Debt Instrument, Interest Rate, Effective Percentage Unamortized debt discount Debt Instrument, Unamortized Discount Intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Deferred Tax Assets, Gross [Abstract] Deferred Tax Assets, Gross [Abstract] Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Premises and equipment Deferred Tax Assets, Property, Plant and Equipment Other real estate owned Deferred Tax Assets, Other Real Estate Owned Deferred Tax Assets, Other Real Estate Owned Accrued stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Federal tax loss carryforward Deferred Tax Assets, Operating Loss Carryforwards, Domestic State tax loss carryforward Deferred Tax Assets, Operating Loss Carryforwards, State and Local Alternative minimum tax credit carryforward Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Lease liabilities Deferred Tax Assets, Operating Lease Liability Deferred Tax Assets, Operating Lease Liability Net unrealized securities losses Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross