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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,297,642 $ 1,062,343 $ 1,031,596 $ 1,230,575
Other comprehensive loss before reclassifications (62,644) (108,718) (58,878) (333,168)
Amounts reclassified from accumulated other comprehensive income 34 34 101 102
Net current-period other comprehensive (loss) income (62,610) (108,684) (58,777) (333,066)
Ending balance 1,257,683 984,497 1,257,683 984,497
Unrealized Loss on Securities Available for Sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (338,251) (249,148) (342,017) (24,698)
Other comprehensive loss before reclassifications (62,644) (108,718) (58,878) (333,168)
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Net current-period other comprehensive (loss) income (62,644) (108,718) (58,878) (333,168)
Ending balance (400,895) (357,866) (400,895) (357,866)
Postretirement Plans Asset (Liability)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 109 (204) 42 (272)
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 34 34 101 102
Net current-period other comprehensive (loss) income 34 34 101 102
Ending balance 143 (170) 143 (170)
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (338,142) (249,352) (341,975) (24,970)
Ending balance $ (400,752) $ (358,036) $ (400,752) $ (358,036)