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Note 1 - Nature of Business and Significant Accounting Policies (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) subsidiary shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Number of subsidiaries commercial banks | subsidiary |  |  |  |  | 4 |  |  |
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities | subsidiary |  |  |  |  | 6 |  |  |
Cash Reserve Deposit Required and Made |  |  |  |  | $ 0 | $ 38,060,000 |  |
Initial Direct Leasing Costs As a Percentage of Cost |  |  |  |  | 5.50% |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  |  | 1 year |  |  |
Commercial Real Estate Owner Occupied, Percentage |  |  |  |  | 26.00% | 26.00% |  |
Lending Threshold Requiring Additional Loan Review |  |  |  |  | $ 1,000,000 |  |  |
Goodwill impairment | $ 0 | $ 0 |  |  | $ 500,000 | $ 3,000,000 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  |  |  | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  |  |  |  | 354,899 | 365,084 | 358,270 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  | $ 7,300,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  | 7,300,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  | $ 270,000 | $ 303,000 | $ 365,000 |
Preferred stock, authorized (in shares) | shares |  |  |  |  | 250,000 | 250,000 |  |
Preferred stock, outstanding (in shares) | shares |  |  |  |  | 0 | 0 |  |
Common stock, outstanding (in shares) | shares |  |  |  |  | 15,805,711 | 15,828,098 |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 2,150,000 | $ 2,469,000 | 1,443,000 |
Retained earnings |  |  |  |  | 300,804,000 | 245,836,000 |  |
Less allowance |  |  |  |  | $ 84,376,000 | $ 36,001,000 | 39,847,000 | $ 34,356,000
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |
Initial Direct Leasing Costs As a Percentage of Cost |  |  |  |  | 3.20% | 3.90% |  |
Employee Stock Option |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  |  | $ 399,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 1 year 7 months 2 days |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 297,000 | $ 475,000 | 472,000 |
In The Money Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  |  |  |  | 329,736 |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  |  | $ 2,800,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 1 year 10 months 24 days |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 1,619,000 | 1,850,000 | 857,000 |
Bates Companies |  |  |  |  |  |  |  |
Goodwill impairment |  |  | $ 3,000,000 | $ 500,000 | 500,000 | 3,000,000 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  | $ 3,000,000 |  |  |
Subsidiaries [Member] | Fixed Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |
Financing Receivable, Term |  |  |  |  | 15 years |  |  |
Construction Loans [Member] |  |  |  |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent |  |  |  |  | 100.00% |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Term Loans, Generally Maximum Term |  |  |  |  | 7 years |  |  |
Less allowance |  |  |  |  | $ 35,421,000 | 16,072,000 | 16,420,000 | 14,323,000
Commercial Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent |  |  |  |  | 300.00% |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Less allowance |  |  |  |  | $ 42,161,000 | $ 15,379,000 | $ 17,719,000 | $ 13,963,000
Minimum |  |  |  |  |  |  |  |
Residual Value Percent of Cost |  |  |  |  | 3.00% |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  |  | 6 months |  |  |
Loan or lease portfolio, exposure to risk |  |  |  |  | $ 250,000 |  |  |
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 |  |  |  |  |  |  |  |
Residual Value Percent of Cost |  |  |  |  | 25.00% |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  |  | 1 year |  |  |
Financing Receivable, Credit Weaknesses Borrowers, Term |  |  |  |  | 365 days |  |  |
Permanent loans term |  |  |  |  | 20 years |  |  |
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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