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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,031,596 $ 1,230,575 $ 893,421
Other comprehensive income (loss) before reclassifications 33,598 (316,783) (40,729)
Amounts reclassified from accumulated other comprehensive income 347 (222) 1,409
Net current-period other comprehensive income (loss) 33,945 (317,005) (39,320)
Ending balance 1,372,380 1,031,596 1,230,575
Unrealized Gain (Loss) on Securities Available for Sale      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (342,017) (24,698) 15,749
Other comprehensive income (loss) before reclassifications 34,064 (317,319) (41,400)
Amounts reclassified from accumulated other comprehensive income 0 0 953
Net current-period other comprehensive income (loss) 34,064 (317,319) (40,447)
Ending balance (307,953) (342,017) (24,698)
Postretirement Plans (Liability) Asset      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 42 (272) (1,399)
Other comprehensive income (loss) before reclassifications (466) 536 671
Amounts reclassified from accumulated other comprehensive income 347 (222) 456
Net current-period other comprehensive income (loss) (119) 314 1,127
Ending balance (77) 42 (272)
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (341,975) (24,970) 14,350
Ending balance $ (308,030) $ (341,975) $ (24,970)