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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,376,099 $ 1,299,961 $ 1,372,380 $ 1,031,596
Other comprehensive loss before reclassifications 6,619 (24,142) (8,092) 3,766
Amounts reclassified from accumulated other comprehensive income 163 34 931 67
Net current-period other comprehensive (loss) income 6,782 (24,108) (7,161) 3,833
Ending balance 1,404,342 1,297,642 1,404,342 1,297,642
Unrealized Loss on Securities Available for Sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (321,915) (314,109) (307,953) (342,017)
Other comprehensive loss before reclassifications 6,619 (24,142) (8,092) 3,766
Amounts reclassified from accumulated other comprehensive income 143 0 892 0
Net current-period other comprehensive (loss) income 6,762 (24,142) (7,200) 3,766
Ending balance (315,153) (338,251) (315,153) (338,251)
Postretirement Plans Asset (Liability)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (58) 75 (77) 42
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 20 34 39 67
Net current-period other comprehensive (loss) income 20 34 39 67
Ending balance (38) 109 (38) 109
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (321,973) (314,034) (308,030) (341,975)
Ending balance $ (315,191) $ (338,142) $ (315,191) $ (338,142)