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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 396,694 $ 397,026 $ 404,415 $ 366,991 $ 374,642 $ 292,295 $ 404,415 $ 292,295
Other comprehensive income (loss), net of tax 40,282 (6,279) (12,400) (58,685) (16,834) 33,796 21,603 (41,723)
Balance 439,678 396,694 397,026 315,982 366,991 374,642 439,678 315,982
Net unrealized holding gains (losses) on available for sale securities                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (191,448) (185,002) (171,539) (193,527) (176,693) (210,489) (171,539) (210,489)
Other comprehensive income (loss) before reclassification 41,452 (6,545) (15,149) (59,786) (16,834) 33,891    
Amounts reclassified from accumulated other comprehensive income (loss) 333 99 1,686 488 0 (95)    
Other comprehensive income (loss), net of tax 41,785 (6,446) (13,463) (59,298) (16,834) 33,796    
Balance (149,663) (191,448) (185,002) (252,825) (193,527) (176,693) (149,663) (252,825)
Reclassification adjustment for (gains) losses realized in income on fair value hedge                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance 217 50 (1,013) 0 0 0 (1,013) 0
Other comprehensive income (loss) before reclassification 0 0 0 0 0 0    
Amounts reclassified from accumulated other comprehensive income (loss) (1,503) 167 1,063 613 0 0    
Other comprehensive income (loss), net of tax (1,503) 167 1,063 613 0 0    
Balance (1,286) 217 50 613 0 0 (1,286) 613
Change in funded status of post-retirement plan                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (2) (2) (2) (1) (1) (1) (2) (1)
Other comprehensive income (loss) before reclassification 0 0 0 0 0 0    
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0 0 0    
Other comprehensive income (loss), net of tax 0 0 0 0 0 0    
Balance (2) (2) (2) (1) (1) (1) (2) (1)
Accumulated Other Comprehensive Income (Loss)                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (191,233) (184,954) (172,554) (193,528) (176,694) (210,490) (172,554) (210,490)
Other comprehensive income (loss) before reclassification 41,452 (6,545) (15,149) (59,786) (16,834) 33,891    
Amounts reclassified from accumulated other comprehensive income (loss) (1,170) 266 2,749 1,101 0 (95)    
Other comprehensive income (loss), net of tax 40,282 (6,279) (12,400) (58,685) (16,834) 33,796    
Balance $ (150,951) $ (191,233) $ (184,954) $ (252,213) $ (193,528) $ (176,694) $ (150,951) $ (252,213)