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Note 7 - Derivatives and Hedging Activities - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Swapped loan portfolio loan-to-value percentage, including the potential swap exposure 65.00%  
Interest rate swaps    
Derivative [Line Items]    
Interest rate swaps collateralized by investment securities $ 214,892 $ 150,102
Interest rate swaps | Cash    
Derivative [Line Items]    
Interest rate swaps collateralized by investment securities 39,431 51,680
Interest rate swaps | U.S. govt. sponsored agency securities    
Derivative [Line Items]    
Interest rate swaps collateralized by investment securities 6,222 6,413
Interest rate swaps | Municipal securities    
Derivative [Line Items]    
Interest rate swaps collateralized by investment securities 151,107 68,651
Interest rate swaps | Residential mortgage-backed and related securities    
Derivative [Line Items]    
Interest rate swaps collateralized by investment securities $ 18,132 $ 23,358