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Note 13 - Commitments and Off-balance-sheet Risk (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 42,246,000 $ 35,363,000 $ 37,967,000 $ 23,889,000
Term Debt, Secured by Real Estate Balloon Payment, Period (Year) 5 years      
Financing Receivable, before Allowance for Credit Loss, Total $ 3,916,619,000 $ 3,453,459,000    
London Interbank Offered Rate (LIBOR) [Member]        
Financing Receivable, before Allowance for Credit Loss, Total $ 368,000,000      
Maximum [Member]        
Amortization Period for Term Debt, Secured by Real Estate (Year) 25 years      
Term Debt Secured, by Non-real Estate Collateral Maturity Period (Year) 7 years      
Minimum [Member]        
Amortization Period for Term Debt, Secured by Real Estate (Year) 10 years      
Term Debt Secured, by Non-real Estate Collateral Maturity Period (Year) 3 years      
Retail and Commercial Lines of Credit and Credit Card Receivables [Member] | Maximum [Member]        
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 100,000      
Commercial Line of Credit Facilities [Member] | Maximum [Member]        
Line of Credit Facility, Expiration Period (Month) 24 months      
Commercial Line of Credit Facilities [Member] | Minimum [Member]        
Line of Credit Facility, Expiration Period (Month) 12 months