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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,372,380 $ 1,031,596
Other comprehensive loss before reclassifications (14,711) 27,908
Amounts reclassified from accumulated other comprehensive income 768 33
Net current-period other comprehensive (loss) income (13,943) 27,941
Ending balance 1,376,099 1,299,961
Unrealized Loss on Securities Available for Sale    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (307,953) (342,017)
Other comprehensive loss before reclassifications (14,711) 27,908
Amounts reclassified from accumulated other comprehensive income 749 0
Net current-period other comprehensive (loss) income (13,962) 27,908
Ending balance (321,915) (314,109)
Postretirement Plans Asset (Liability)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (77) 42
Other comprehensive loss before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income 19 33
Net current-period other comprehensive (loss) income 19 33
Ending balance (58) 75
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (308,030) (341,975)
Ending balance $ (321,973) $ (314,034)