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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Before-Tax Amount    
Net unrealized gains/losses $ 29,527 $ 16,181
Tax (Expense) Benefit    
Net unrealized gains/losses (7,234) (3,966)
Net of Tax    
Other comprehensive income 22,293 12,215
Net unrealized gains/losses    
Before-Tax Amount    
Change in net unrealized gain/loss during the period 29,302 15,756
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income (429) 0
Net unrealized gains/losses 28,873 15,756
Tax (Expense) Benefit    
Change in net unrealized gain/loss during the period (7,179) (3,862)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 105 0
Net unrealized gains/losses (7,074) (3,862)
Net of Tax    
Change in net unrealized gain/loss during the period 22,123 11,894
Net of tax (324) 0
Other comprehensive income 21,799 11,894
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 601 421
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (147) (103)
Net of Tax    
Net of tax 454 318
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 53 4
Tax (Expense) Benefit    
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (13) (1)
Net of Tax    
Net of tax 40 3
Employee benefit plans    
Before-Tax Amount    
Net unrealized gains/losses 654 425
Tax (Expense) Benefit    
Net unrealized gains/losses (160) (104)
Net of Tax    
Other comprehensive income $ 494 $ 321