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Note 1 - Nature of Business and Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2024
USD ($)
subsidiary
segment
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Number of subsidiaries commercial banks | subsidiary 4    
Number of portfolio segments | segment 8    
Maximum term for financial receivable 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    
Revenue related to gain on loan securitizations $ 955,000 $ 664,000 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares 158,911 233,967 295,077
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 9,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 7,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 887,000 $ 440,000 $ 387,000
Accrued investment income receivable $ 30,900,000 $ 28,800,000  
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    
Interest rate swaps      
Revenue related to interest rate swaps 70,100,000 $ 91,400,000 $ 41,300,000
Other Assets      
Accrued investment income receivable 30,900,000 $ 28,800,000  
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    
Employee Stock Option      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 357,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 7 days    
In The Money Options      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares 220,846    
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 1 month 24 days    
Subsidiaries | Fixed Rate Residential Mortgage      
Financing receivable, term 15 years    
Commercial Portfolio Segment      
Financing Receivable, Term Loans, Generally Maximum Term 7 years    
Minimum      
Maximum term for financial receivable 6 months    
Residual Value Percent of Cost 3.00%    
Minimum | Subsidiaries | Adjustable Rate Residential Mortgage      
Financing receivable, term 1 year    
Minimum | Commercial Portfolio Segment | Term Loan      
Financing receivable, term 3 years    
Maximum      
Permanent loans term 20 years    
Financing Receivable, Credit Weaknesses Borrowers, Term 365 days    
Maximum term for financial receivable 1 year    
Residual Value Percent of Cost 25.00%    
Maximum | Subsidiaries | Adjustable Rate Residential Mortgage      
Financing receivable, term 5 years    
Maximum | Commercial Portfolio Segment | Term Loan      
Financing receivable, term 5 years    
Core deposit intangibles      
Estimated useful life 10 years