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Other Comprehensive Income (Loss) - Reclassifications Out of ACOI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Before-Tax Amount        
Net unrealized gains $ 1,514 $ (5,654) $ 7,320 $ 23,899
Tax (Expense) Benefit        
Net unrealized gains (605) 2,261 (2,926) (9,558)
Net of Tax        
Net current-period other comprehensive income (loss) 909 (3,393) 4,394 14,341
Available-for-sale securities:        
Before-Tax Amount        
Change in net unrealized gain/loss during the period 712 (5,554) 5,756 23,763
Reclassification adjustment for net realized loss on sale of available-for-sale securities included in net income 423 (455) 423 (926)
Net unrealized gains 1,135 (6,009) 6,179 22,837
Tax (Expense) Benefit        
Change in net unrealized gain/loss during the period (286) 2,221 (2,302) (9,503)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (169) 182 (169) 370
Net unrealized gains (455) 2,403 (2,471) (9,133)
Net of Tax        
Change in net unrealized gain/loss during the period 426 (3,333) 3,454 14,260
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 254 (273) 254 (556)
Net current-period other comprehensive income (loss) 680 (3,606) 3,708 13,704
Amortization of net retirement plan actuarial gain        
Before-Tax Amount        
Reclassification adjustment for net realized loss on sale of available-for-sale securities included in net income [1],[2] 376 335 1,130 1,004
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (149) (134) (451) (402)
Net of Tax        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 227 201 679 602
Amortization of net retirement plan prior service cost        
Before-Tax Amount        
Reclassification adjustment for net realized loss on sale of available-for-sale securities included in net income [1],[2] 3 20 11 58
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (1) (8) (4) (23)
Net of Tax        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 2 12 7 35
Employee benefit plans        
Before-Tax Amount        
Reclassification adjustment for net realized loss on sale of available-for-sale securities included in net income [1],[2] 379 355 1,141 1,062
Net unrealized gains 379 355 1,141 1,062
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities [1] (150) (142) (455) (425)
Net unrealized gains (150) (142) (455) (425)
Net of Tax        
Change in net unrealized gain/loss during the period 0 0 0 0
Reclassification adjustment for net realized gain on sale included in available-for-sale securities [1] 229 213 686 637
Net current-period other comprehensive income (loss) $ 229 $ 213 $ 686 $ 637
[1] Amounts in parentheses indicated debits in income statement.
[2] The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - “Employee Benefit Plan”).