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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | $ 26,674 | $ 26,674 | $ 29,672 | $ 23,526 | $ 14,740
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax | 17,539 | 17,539 | (20,116) | (2,928) | (3,005)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (454) | (454) | 0 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (9,589) | (9,589) | (49,788) | (26,454) | $ (17,745)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  | (1,511) | 4,046 | 9,241 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax |  | 37,322 | (17,586) | 1,261 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | (454) | 0 | 0 |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 38,379 | (21,632) | (7,980) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax |  | 1,487 | 1,075 | 455 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | (333) | (2,024) | 1,184 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (1,820) | (3,099) | (729) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (2,998) | 2,971 | 8,786 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax |  | 37,655 | (15,562) | 77 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | (454) |  |  |
Other Comprehensive Income (Loss), Net of Tax |  | 40,199 | (18,533) | (8,709) |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | (995) |
Debt Securities, Held-to-maturity, Transfer, Amount |  | 373,900 | 0 | 0 |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | $ 24,200 |  |  |  |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax |  | 19,095 | 0 | 0 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 1,882 | 1,361 | 576 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 1,882 | 1,361 | 576 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 395 | 286 | 121 |
Gain (Loss) on Sale of Investments |  | (421) | (2,271) | 1,821 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax |  | 421 | 2,562 | (1,821) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 88 | 538 | (637) |
Available-for-sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Investments |  | (421) | (2,562) | 1,821 |
AOCI Attributable to Parent [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  | 40,199 | (18,533) | (8,709) |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | (3,806) |
Pension Plan [Member] | AOCI Attributable to Parent [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) |
Debt Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | (2,024) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  | (1,184) |
Debt Securities [Member] | AOCI Attributable to Parent [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) |
Available-for-sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | $ 333 | $ 2,024 | (1,184) |
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) |

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