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Accumulated Other Comprehensive Income - Amount reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Securities gains (losses), net $ 24 $ 103 $ 21 $ 104
Income tax expense (4,992) (1,688) (14,603) (6,106)
Net Income (Loss) 20,762 8,741 57,754 31,034
Amount reclassified from accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net Income (Loss) 15 4 8 (142)
Unrealized gains and (Losses) on available- for-sale Securities | Amount reclassified from accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Securities gains (losses), net 24 103 21 104
Income tax expense (6) (26) (5) (26)
Net Income (Loss) 18 77 16 78
Retirement plans | Amount reclassified from accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Change in funded status of post retirement benefits, net of taxes (4) (97) (11) (293)
Income tax expense 1 24 3 73
Net Income (Loss) $ (3) $ (73) $ (8) $ (220)