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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Before-Tax Amount        
Net unrealized gains/losses $ (7,287) $ 1,514 $ (31,398) $ 7,320
Tax (Expense) Benefit        
Net unrealized gains/losses 1,786 (605) 7,692 (2,926)
Net of Tax        
Net current-period other comprehensive (loss) income (5,501) 909 (23,706) 4,394
Net unrealized gains/losses        
Before-Tax Amount        
Change in net unrealized gain/loss during the period (7,691) 712 (32,375) 5,756
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income (30) 423 (324) 423
Net unrealized gains/losses (7,721) 1,135 (32,699) 6,179
Tax (Expense) Benefit        
Change in net unrealized gain/loss during the period 1,885 (286) 7,932 (2,302)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities 7 (169) 79 (169)
Net unrealized gains/losses 1,892 (455) 8,011 (2,471)
Net of Tax        
Change in net unrealized gain/loss during the period (5,806) 426 (24,443) 3,454
Net of tax (23) 254 (245) 254
Net current-period other comprehensive (loss) income (5,829) 680 (24,688) 3,708
Amortization of net retirement plan actuarial gain        
Before-Tax Amount        
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income 430 376 1,289 1,130
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (105) (149) (316) (451)
Net of Tax        
Net of tax 325 227 973 679
Amortization of net retirement plan prior service cost        
Before-Tax Amount        
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income 4 3 12 11
Tax (Expense) Benefit        
Reclassification adjustment for net realized gain on sale included in available-for-sale securities (1) (1) (3) (4)
Net of Tax        
Net of tax 3 2 9 7
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses 434 379 1,301 1,141
Tax (Expense) Benefit        
Net unrealized gains/losses (106) (150) (319) (455)
Net of Tax        
Net current-period other comprehensive (loss) income $ 328 $ 229 $ 982 $ 686