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Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Before-Tax Amount        
Net unrealized gains/losses / Other comprehensive income (loss) $ 12,011 $ 296 $ (20,940) $ 29,824
Tax (Expense) Benefit        
Net unrealized gains/losses / Other comprehensive income (loss) (2,943) (73) 5,132 (7,308)
Net of Tax        
Other comprehensive income 9,068 223 (15,808) 22,516
Net unrealized gain/loss        
Before-Tax Amount        
Change in net unrealized gain/loss during the period 11,244 (339) (22,197) 28,963
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 0 0 (330) (429)
Net unrealized gains/losses / Other comprehensive income (loss) 11,244 (339) (22,527) 28,534
Tax (Expense) Benefit        
Change in net unrealized gain/loss during the period (2,755) 82 5,440 (7,097)
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 0 0 81 105
Net unrealized gains/losses / Other comprehensive income (loss) (2,755) 82 5,521 (6,992)
Net of Tax        
Change in net unrealized gain/loss during the period 8,489 (257) (16,757) 21,866
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 0 0 (249) (324)
Other comprehensive income 8,489 (257) (17,006) 21,542
Amortization of net retirement plan actuarial gain/loss        
Before-Tax Amount        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 712 581 1,476 1,183
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income (175) (142) (362) (290)
Net of Tax        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 537 439 1,114 893
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 55 54 111 107
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income (13) (13) (27) (26)
Net of Tax        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 42 41 84 81
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses / Other comprehensive income (loss) 767 635 1,587 1,290
Tax (Expense) Benefit        
Net unrealized gains/losses / Other comprehensive income (loss) (188) (155) (389) (316)
Net of Tax        
Other comprehensive income $ 579 $ 480 $ 1,198 $ 974