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Note 4 - Debt Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale $ 546,559 $ 490,182
Investment securities available-for-sale, debt securities gross unrealized holding gains 47 5
Investment securities available-for-sale, debt securities gross unrealized holding losses (84,709) (84,252)
Investment securities available-for-sale, debt securities gross unrealized fair value hedge gains (losses) 4,830 (1,749)
Investment securities available-for-sale, debt securities amortized cost 626,391 576,178
US Treasury Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale 18,010 6,451
Investment securities available-for-sale, debt securities gross unrealized holding gains 6 3
Investment securities available-for-sale, debt securities amortized cost 18,004 6,448
US Government Agencies Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale 66,908 74,122
Investment securities available-for-sale, debt securities gross unrealized holding losses (9,051) (10,828)
Investment securities available-for-sale, debt securities amortized cost 75,959 84,950
US States and Political Subdivisions Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale 86,352 [1] 89,189 [2]
Investment securities available-for-sale, debt securities gross unrealized holding losses (20,631) (18,714)
Investment securities available-for-sale, debt securities gross unrealized fair value hedge gains (losses) 1,566 (445)
Investment securities available-for-sale, debt securities amortized cost 105,417 108,348
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale 198,510 [1] 224,238 [2]
Investment securities available-for-sale, debt securities gross unrealized holding losses (38,902) (37,831)
Investment securities available-for-sale, debt securities gross unrealized fair value hedge gains (losses) 3,264 (1,304)
Investment securities available-for-sale, debt securities amortized cost 234,148 263,373
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale 161,646 89,973
Investment securities available-for-sale, debt securities gross unrealized holding gains 31  
Investment securities available-for-sale, debt securities gross unrealized holding losses (15,821) (16,383)
Investment securities available-for-sale, debt securities amortized cost 177,436 106,356
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale   6,209
Investment securities available-for-sale, debt securities gross unrealized holding gains   2
Investment securities available-for-sale, debt securities gross unrealized holding losses   (496)
Investment securities available-for-sale, debt securities amortized cost   $ 6,703
Corporate Debt Securities and Money Market Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale 15,133  
Investment securities available-for-sale, debt securities gross unrealized holding gains 10  
Investment securities available-for-sale, debt securities gross unrealized holding losses (304)  
Investment securities available-for-sale, debt securities amortized cost $ 15,427  
[1] Includes derivatives designated as fair value hedging instruments.
[2] Includes derivatives designated as fair value hedging instruments.