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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | $ 1,361 | $ 576 | $ 773 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 1,361 | 576 | 773 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 286 | 121 | 271 |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (29,672) | (23,526) | (14,740) | $ (15,351)
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax | (20,116) | (2,928) | (3,005) | (292)
Accumulated Other Comprehensive Income (Loss), Net of Tax | (49,788) | (26,454) | (17,745) | $ (15,643)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | (2,971) | (8,786) | 611 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | (15,562) | 77 | (2,713) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | (4,046) | (9,241) | 109 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax | (17,586) | 1,261 | (2,713) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (21,632) | (7,980) | (2,604) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 1,075 | 455 | 502 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 3,099 | (729) | 502 |
Other Comprehensive Income (Loss), Net of Tax | (18,533) | (8,709) | (2,102) |
Gain (Loss) on Sale of Investments | 2,271 | (1,821) | 0 |
Other than Temporary Impairment Losses, Investments | 0 | 0 | 0 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 2,562 | (1,821) | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 538 | (637) | 0 |
Available-for-sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2,024 | (1,184) | 0 |
Debt Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2,024 | (1,184) | 0 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  | (23,526) |  |
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax |  | (3,923) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | (27,449) |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (3,806) |  |
Other Comprehensive Income (Loss), Net of Tax | (18,533) | (8,709) | $ (2,102) |
Accumulated Other Comprehensive (Loss) Income | Pension Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (3,175) |  |
Accumulated Other Comprehensive (Loss) Income | Debt Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (631) |  |
Accumulated Other Comprehensive (Loss) Income | Accounting Standards Update 2016-01 [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ (995) |  |
Available-for-sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Gain (Loss) on Sale of Investments | $ 2,562 |  |  |

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