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Other Comprehensive Income (Loss) - Schedule of Activity (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 balances $ 636,441 $ 624,318 $ 617,390 $ 728,941
Other comprehensive loss before reclassifications (28,273) (64,873) (20,932) (188,727)
Amounts reclassified from accumulated other comprehensive (loss) income 47,764 505 53,592 1,440
Other comprehensive income (loss) 19,491 (64,368) 32,660 (187,287)
Ending balances 612,356 572,959 612,356 572,959
Available-for- Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (166,137) (138,414) (178,803) (14,560)
Other comprehensive loss before reclassifications (28,273) (64,873) (20,932) (188,727)
Amounts reclassified from accumulated other comprehensive (loss) income 47,513 37 52,838 37
Other comprehensive income (loss) 19,240 (64,836) 31,906 (188,690)
Ending balances (146,897) (203,250) (146,897) (203,250)
Employee Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (29,383) (40,455) (29,886) (41,390)
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive (loss) income 251 468 754 1,403
Other comprehensive income (loss) 251 468 754 1,403
Ending balances (29,132) (39,987) (29,132) (39,987)
Accumulated Other Comprehensive (Loss) Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (195,520) (178,869) (208,689) (55,950)
Other comprehensive income (loss) 19,491 (64,368) 32,660 (187,287)
Ending balances $ (176,029) $ (243,237) $ (176,029) $ (243,237)