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Note 1 - Nature of Business and Significant Accounting Policies (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2021 USD ($) | Nov. 30, 2021 USD ($) | Nov. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) subsidiary segment shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Jan. 01, 2021 USD ($) | Dec. 31, 2018 USD ($)
Retained earnings |  |  |  | $ 386,077,000 | $ 300,804,000 |  |  |
Less allowance |  |  |  | 78,721,000 | $ 84,376,000 | $ 36,001,000 | $ 84,376,000 | $ 39,847,000
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  |  | $ 198,000 |  |  |  |
Number of subsidiaries commercial banks | subsidiary |  |  |  | 4 |  |  |  |
Number of portfolio segments | segment |  |  |  | 8 |  |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  | 1 year |  |  |  |
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities | subsidiary |  |  |  | 6 |  |  |  |
Cash Reserve Deposit Required and Made |  |  |  | $ 0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  |  |  | 318,266 | 354,899 | 365,084 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  | $ 11,600,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  | 10,800,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  | 419,000 | $ 270,000 | $ 303,000 |  |
Allocated Share-based Compensation Expense |  |  |  | 2,352,000 | 2,150,000 | 2,469,000 |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 |  | 500,000 | 3,000,000 |  |
Minimum outstanding balance considered for calculation of low quality loans allowance on case-to-case basis |  |  |  | 250,000 |  |  |  |
Maximum principal balance considered for placing low quality loans in the unique pool |  |  |  | 250,000 |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Accrued investment income receivable |  |  |  | 15,000,000 |  |  |  |
Subsidiary banks with an asset size of $1.0 billion or less |  |  |  |  |  |  |  |
Lending Threshold Requiring Additional Loan Review |  |  |  | 1,000,000 |  |  |  |
Subsidiary banks with an asset size of over $1.0 billion |  |  |  |  |  |  |  |
Lending Threshold Requiring Additional Loan Review |  |  |  | 2,000,000.0 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Less allowance |  |  |  |  |  |  | (8,102,000) |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  |  |  |  |  | 183,000 |
Off-Balance Sheet, Credit Loss, Liability |  |  |  |  |  |  | 9,117,000 |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |
Less allowance |  |  |  | (8,102,000) |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  |  | 183,000 |  |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  | 937,000 |
Less allowance |  |  |  |  |  |  | 8,100,000 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  |  |  |  |  | 183,000 |
Off-Balance Sheet, Credit Loss, Liability |  |  |  |  |  |  | 9,100,000 |
Employee Stock Option |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | $ 382,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 1 year 11 months 23 days |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 270,000 | 297,000 | 475,000 |  |
In The Money Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  |  |  | 367,998 |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | $ 2,700,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 1 year 8 months 12 days |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 1,864,000 | 1,619,000 | 1,850,000 |  |
Subsidiaries [Member] | Fixed Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |
Financing receivable, term |  |  |  | 15 years |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Less allowance |  |  |  | $ 29,889,000 | $ 35,421,000 | $ 16,072,000 | 35,421,000 | $ 16,420,000
Financing Receivable, Term Loans, Generally Maximum Term |  |  |  | 7 years |  |  |  |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Less allowance |  |  |  |  |  |  | $ (35,421,000) |
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |
Less allowance |  |  |  | $ (35,421,000) |  |  |  |
Minimum |  |  |  |  |  |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  | 6 months |  |  |  |
Residual Value Percent of Cost |  |  |  | 3.00% |  |  |  |
Minimum | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |
Financing receivable, term |  |  |  | 1 year |  |  |  |
Minimum | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |  |  |  |
Financing receivable, term |  |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |  |
Permanent loans term |  |  |  | 20 years |  |  |  |
Financing Receivable, Credit Weaknesses Borrowers, Term |  |  |  | 365 days |  |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  | 1 year |  |  |  |
Residual Value Percent of Cost |  |  |  | 25.00% |  |  |  |
Maximum | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |
Financing receivable, term |  |  |  | 5 years |  |  |  |
Maximum | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |  |  |  |
Financing receivable, term |  |  |  | 5 years |  |  |  |
Core Deposits [Member] |  |  |  |  |  |  |  |
Estimated useful life |  |  |  | 10 years |  |  |  |
Customer Lists [Member] |  |  |  |  |  |  |  |
Estimated useful life |  |  |  | 15 years |  |  |  |

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