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Note 1 - Significant Accounting Policies (Details Textual)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
shares
Dec. 31, 2023
USD ($)
Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities 5    
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance $ 0   $ 0
Financing Receivable, Unamortized Loan Cost (Fee) $ 2,500   2,400
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 $ 14,600   19,000
Financing Receivable, Credit Loss, Expense (Reversal) 1,300 $ 600  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss 17,400 $ 16,900  
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding 1,420,000   $ 1,400,000
Goodwill, Impairment Loss $ 0    
Restricted Stock [Member]      
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares 327,000 360,000  
Share-Based Payment Arrangement, Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares   5,000