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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | $ 26,674 | $ 34,421 | $ 26,674 | $ 29,672 | $ 23,526
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax | 17,539 | 40,690 | 17,539 | (20,116) | (2,928)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (454) | (698) | (454) | 0 |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (9,589) | 5,571 | (9,589) | (49,788) | (26,454)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  | 8,675 | (1,511) | 4,046 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax |  | 25,747 | 37,322 | (17,586) |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | (244) | (454) | 0 |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 16,828 | 38,379 | (21,632) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax |  | 928 | 1,487 | 1,075 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 2,596 | (333) | (2,024) |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | 0 | 0 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 1,668 | (1,820) | (3,099) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 7,747 | (2,998) | 2,971 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax |  | 23,151 | 37,655 | (15,562) |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | (244) | (454) |  |
Other Comprehensive Income (Loss), Net of Tax |  | 15,160 | 40,199 | (18,533) |
Debt Securities, Held-to-maturity, Transfer, Amount |  |  | 373,900 |  |
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 |  | 0 | 19,095 | 0 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 1,175 | 1,882 | 1,361 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 1,175 | 1,882 | 1,361 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 247 | 395 | 286 |
Gain (Loss) on Sale of Investments |  | 3,286 | (421) | (2,271) |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax |  | (3,286) | 421 | 2,562 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | (690) | 88 | 538 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax |  |  |  |  | (995)
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  | (995)
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  |  |  | 3,175
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax |  |  |  |  | (631)
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  | (3,806)
Available-for-sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Investments |  | 3,286 | (421) | (2,562) |
Available-for-sale 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 |  | $ (2,596) | $ 333 | $ 2,024 |
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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