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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning $ 617,390 $ 728,941
Other comprehensive income (loss) 20,843 (79,899)
Balances at Ending 649,765 657,492
Available-for- Sale Debt Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning (178,803) (14,560)
Other comprehensive income (loss) before reclassifications 20,578 (80,405)
Amounts reclassified from accumulated other comprehensive (loss) income 0 0
Other comprehensive income (loss) 20,578 (80,405)
Balances at Ending (158,225) (94,965)
Employee Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning (29,886) (41,390)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive (loss) income 265 506
Other comprehensive income (loss) 265 506
Balances at Ending (29,621) (40,884)
Accumulated Other Comprehensive (Loss) Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning (208,689) (55,950)
Other comprehensive income (loss) before reclassifications 20,578 (80,405)
Amounts reclassified from accumulated other comprehensive (loss) income 265 506
Other comprehensive income (loss) 20,843 (79,899)
Balances at Ending $ (187,846) $ (135,849)