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v3.24.0.1

Note 1 - Nature of Business and Significant Accounting Policies (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2023 USD ($) | Nov. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) subsidiary segment shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Number of subsidiaries commercial banks | subsidiary |  |  | 4 |  |
Number of portfolio segments | segment |  |  | 8 |  |
Financing Receivable, Lines of Credit Maximum Term |  |  | 1 year |  |
Minimum number of months of repayment performance to restore to accrual status, monthly payment loans |  |  | 15 months |  |
Minimum number of years of repayment performance to restore to accrual status, quarterly or semi-monthly payment loans |  |  | 15 months |  |
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities | subsidiary |  |  | 7 |  |
Cash Reserve Deposit Required and Made |  |  | $ 0 | $ 0 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | $ 1,000,000,000.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  |  | 233,967 | 295,077 | 318,266
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  | $ 7,600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  | 7,200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | 440,000 | $ 387,000 | $ 419,000
Allocated Share-based Compensation Expense |  |  | 2,678,000 | 2,438,000 | 2,352,000
Accrued investment income receivable |  |  | $ 31,800,000 | $ 24,300,000 |
Goodwill impairment | $ 0 | $ 0 |  |  |
Preferred Stock, Shares Authorized | shares |  |  | 250,000 | 250,000 |
Preferred Stock, Shares Outstanding | shares |  |  | 0 | 0 |
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 |  |  | 31,800,000 |  |
Subsidiary banks with an asset size of $1.0 billion or less |  |  |  |  |
Lending Threshold Requiring Additional Loan Review |  |  | 1,000,000.0 |  |
Subsidiary banks with an asset size of over $1.0 billion |  |  |  |  |
Lending Threshold Requiring Additional Loan Review |  |  | 2,000,000.0 |  |
Employee Stock Option [Member] |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 566,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 1 year 9 months 7 days |  |
Allocated Share-based Compensation Expense |  |  | $ 286,000 | $ 246,000 | 270,000
In The Money Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  |  | 290,149 |  |
Restricted Stock |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 3,200,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 1 year 9 months 7 days |  |
Allocated Share-based Compensation Expense |  |  | $ 2,084,000 | $ 1,967,000 | $ 1,864,000
Subsidiaries [Member] | Fixed Rate Residential Mortgage [Member] |  |  |  |  |
Financing receivable, term |  |  | 15 years |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Term Loans, Generally Maximum Term |  |  | 7 years |  |
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 |  |

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