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Note 1 - Significant Accounting Policies (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities 5   5    
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance $ 0   $ 0   $ 0
Financing Receivable, Unamortized Loan Cost (Fee) 1,800   $ 1,800   2,200
Interest Income on Commercial and Mortgage Loans Discontinued Period (Day)     90 days    
Maximum Delinquency Period for Consumer and Credit Card Loans to be Charged Off (Day)     120 days    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 28,100   $ 28,100   16,000
Financing Receivable, Credit Loss, Expense (Reversal) 1,600 $ 3,500 3,700 $ 4,800  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss 17,200   17,200   17,300
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding 1,590,000   1,590,000   1,550,000
Servicing Asset at Amortized Cost 12,800   12,800   12,500
Servicing Asset at Fair Value, Amount $ 21,600   21,600   $ 21,000
Goodwill, Impairment Loss     $ 0    
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets   Other Assets   Other Assets
Restricted Stock [Member]          
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares 277,000 303,000 277,000 303,000