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Note 4 - Allowance for Credit Losses on Loans (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 16,823,000 $ 20,569,000 $ 16,987,000
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) (13,000) 7,770,000  
Unfunded Loan Commitment [Member]      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 685,000   $ 594,000
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) $ 91,000 $ 15,000