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Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Before-Tax Amount        
Net unrealized gains/losses / Other comprehensive income (loss) $ (3,728) $ 4,404 $ 26,098 $ 34,853
Tax (Expense) Benefit        
Net unrealized gains/losses / Other comprehensive income (loss) 912 (1,081) (6,398) (8,539)
Net of Tax        
Other comprehensive (loss) income (2,816) 3,323 19,700 26,314
Net unrealized gain/loss        
Before-Tax Amount        
Change in net unrealized gain/loss during the period (4,374) 4,122 24,592 34,014
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 0 (133) (429) (404)
Net unrealized gains/losses / Other comprehensive income (loss) (4,374) 3,989 24,163 33,610
Tax (Expense) Benefit        
Change in net unrealized gain/loss during the period 1,071 (1,011) (6,029) (8,333)
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 0 32 105 99
Net unrealized gains/losses / Other comprehensive income (loss) 1,071 (979) (5,924) (8,234)
Net of Tax        
Change in net unrealized gain/loss during the period (3,303) 3,111 18,563 25,681
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 0 (101) (324) (305)
Other comprehensive (loss) income (3,303) 3,010 18,239 25,376
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 593 411 1,775 1,232
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income (146) (101) (435) (302)
Net of Tax        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 447 310 1,340 930
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 4 160 11
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income (13) (1) (39) (3)
Net of Tax        
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income 40 3 121 8
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses / Other comprehensive income (loss) 646 415 1,935 1,243
Tax (Expense) Benefit        
Net unrealized gains/losses / Other comprehensive income (loss) (159) (102) (474) (305)
Net of Tax        
Other comprehensive (loss) income $ 487 $ 313 $ 1,461 $ 938