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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,404,342 $ 1,297,642 $ 1,372,380 $ 1,031,596
Other comprehensive income before reclassifications 60,366 (62,644) 52,274 (58,878)
Amounts reclassified from accumulated other comprehensive income 19 34 950 101
Net current-period other comprehensive income 60,385 (62,610) 53,224 (58,777)
Ending balance 1,477,525 1,257,683 1,477,525 1,257,683
Unrealized Loss on Securities Available for Sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (315,153) (338,251) (307,953) (342,017)
Other comprehensive income before reclassifications 60,366 (62,644) 52,274 (58,878)
Amounts reclassified from accumulated other comprehensive income 0 0 892 0
Net current-period other comprehensive income 60,366 (62,644) 53,166 (58,878)
Ending balance (254,787) (400,895) (254,787) (400,895)
Postretirement Plans Asset (Liability)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (38) 109 (77) 42
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 19 34 58 101
Net current-period other comprehensive income 19 34 58 101
Ending balance (19) 143 (19) 143
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (315,191) (338,142) (308,030) (341,975)
Ending balance $ (254,806) $ (400,752) $ (254,806) $ (400,752)