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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, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,445,611 $ 1,372,380 $ 1,031,596
Other comprehensive (loss) income before reclassifications 77,620 (3,188) 33,598
Amounts reclassified from accumulated other comprehensive income 55,034 29,189 347
Net current-period other comprehensive (loss) income 132,654 26,001 33,945
Ending balance 1,654,168 1,445,611 1,372,380
Unrealized Gain (Loss) on Securities Available for Sale      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (282,114) (307,953) (342,017)
Other comprehensive (loss) income before reclassifications 77,699 (3,273) 34,064
Amounts reclassified from accumulated other comprehensive income 55,119 29,112 0
Net current-period other comprehensive (loss) income 132,818 25,839 34,064
Ending balance (149,296) (282,114) (307,953)
Postretirement Plans (Liability) Asset      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 85 (77) 42
Other comprehensive (loss) income before reclassifications (79) 85 (466)
Amounts reclassified from accumulated other comprehensive income (85) 77 347
Net current-period other comprehensive (loss) income (164) 162 (119)
Ending balance (79) 85 (77)
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (282,029) (308,030) (341,975)
Ending balance $ (149,375) $ (282,029) $ (308,030)