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Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ (32,974) |
Ending Balance | $ (73,258) |  | (73,258) |
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (50,056) | $ (19,493) | (18,509) | $ (23,047)
Other comprehensive loss before reclassifications | (6,631) | 10,268 | (34,275) | 14,541
Amounts reclassified from accumulated other comprehensive income (loss) | (3) | (932) | (19) | (1,651)
Ending Balance | (56,690) | (10,157) | (56,690) | (10,157)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | 682 | 273 | 458 | 273
Other comprehensive loss before reclassifications | 8 | 0 | 232 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Ending Balance | 690 | 273 | 690 | 273
Unrecognized Pension and Postretirement Plan Income (Costs) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (17,798) | (15,332) | (14,923) | (15,675)
Other comprehensive loss before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 540 | 341 | 879 | 684
Ending Balance | (17,258) | (14,991) | (17,258) | (14,991)
Total |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (67,172) | (34,552) | (32,974) | (38,449)
Other comprehensive loss before reclassifications | (6,623) | 10,268 | (34,043) | 14,541
Amounts reclassified from accumulated other comprehensive income (loss) | 537 | (591) | 860 | (967)
Ending Balance | $ (73,258) | $ (24,875) | (73,258) | $ (24,875)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 3,887 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrecognized Pension and Postretirement Plan Income (Costs) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 3,214 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Total |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | $ 7,101 |

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