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Note 7 - Comprehensive (Loss) Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Balance $ 1,199,397 $ 1,190,970 $ 1,178,751 $ 1,143,147 $ 1,138,519 $ 1,124,212
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]            
Balance (64,640)   (61,775)      
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]            
Balance 33,649   32,360      
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Balance (2,846)   (2,949)      
AOCI Attributable to Parent [Member]            
Balance $ (33,837) $ (33,862) $ (32,364) $ (19,103) $ (8,269) $ (1,404)