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Note 8 - Comprehensive Income - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Balance $ 1,538,344 $ 1,496,431 $ 1,241,704 $ 1,239,496 $ 1,224,227 $ 1,216,620
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]            
Balance (47,214)   (69,632)      
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]            
Balance 10,799   22,481      
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Balance (695)   (695)      
AOCI Attributable to Parent [Member]            
Balance $ (37,110) $ (47,405) $ (47,846) $ (36,753) $ (42,244) $ (35,109)