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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Before-Tax Amount    
Net unrealized gains/losses $ (32,948) $ 29,527
Tax (Expense) Benefit    
Net unrealized gains/losses 8,072 (7,234)
Net of Tax    
Other comprehensive (loss) income (24,876) 22,293
Net unrealized gains/losses    
Before-Tax Amount    
Change in net unrealized gain/loss during the period (33,439) 29,302
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income (329) (429)
Net unrealized gains/losses (33,768) 28,873
Tax (Expense) Benefit    
Change in net unrealized gain/loss during the period 8,193 (7,179)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 80 105
Net unrealized gains/losses 8,273 (7,074)
Net of Tax    
Change in net unrealized gain/loss during the period (25,246) 22,123
Net of tax (249) (324)
Other comprehensive (loss) income (25,495) 21,799
Amortization of net retirement plan actuarial gain    
Before-Tax Amount    
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 764 601
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (187) (147)
Net of Tax    
Net of tax 577 454
Amortization of net retirement plan prior service cost    
Before-Tax Amount    
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 56 53
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (14) (13)
Net of Tax    
Net of tax 42 40
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses 820 654
Tax (Expense) Benefit    
Net unrealized gains/losses (201) (160)
Net of Tax    
Other comprehensive (loss) income $ 619 $ 494