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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Before-Tax Amount    
Net unrealized gains/losses $ (105,810) $ (32,948)
Tax (Expense) Benefit    
Net unrealized gains/losses 25,911 8,072
Net of Tax    
Other comprehensive loss (79,899) (24,876)
Net unrealized gains/losses    
Before-Tax Amount    
Change in net unrealized gain/loss during the period (106,481) (33,439)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 0 (329)
Net unrealized gains/losses (106,481) (33,768)
Tax (Expense) Benefit    
Change in net unrealized gain/loss during the period 26,076 8,193
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 0 80
Net unrealized gains/losses 26,076 8,273
Net of Tax    
Change in net unrealized gain/loss during the period (80,405) (25,246)
Net of tax 0 (249)
Other comprehensive loss (80,405) (25,495)
Amortization of net retirement plan actuarial gain    
Before-Tax Amount    
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 615 764
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (151) (187)
Net of Tax    
Net of tax 464 577
Amortization of net retirement plan prior service cost    
Before-Tax Amount    
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income 56 56
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (14) (14)
Net of Tax    
Net of tax 42 42
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses 671 820
Tax (Expense) Benefit    
Net unrealized gains/losses (165) (201)
Net of Tax    
Other comprehensive loss $ 506 $ 619