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Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period | $ 5,579 | $ (11,341) | $ (6,173) |
Cumulative Effect of New Accounting Principle in Period of Adoption | 11,199 |  |  | $ (1,344)
Other comprehensive income before reclassification adjustment | 12,256 | 17,033 | 2,456 |
Amounts reclassified from accumulated other comprehensive income (loss) | (55) | (17) | (6,394) |
Net gain |  | (96) | 114 |
Net other comprehensive income during the period | 11,654 | 16,920 | (3,824) |
Balance at end of period | 17,233 | 5,579 | (11,341) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | (424) | 0 | 0 |
Net gain | (123) | (96) | 114 |
Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  | (11,697) | (6,166) |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | (1,328)
Other comprehensive income before reclassification adjustment | 15,785 | 16,294 | 2,198 |
Amounts reclassified from accumulated other comprehensive income (loss) | (55) | (17) | (6,401) |
Net other comprehensive income during the period | 15,730 | 16,277 | (4,203) |
Balance at end of period | 20,310 |  | (11,697) |
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  | (105) | (306) |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | (64)
Other comprehensive income before reclassification adjustment | (3,529) | 739 | 258 |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 7 |
Net other comprehensive income during the period | (3,529) | 739 | 265 |
Balance at end of period | (2,895) |  | (105) |
Post-Retirement Obligation |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  | 461 | 299 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 48
Net gain |  | (96) | 114 |
Net other comprehensive income during the period | (547) | (96) | 114 |
Balance at end of period | (182) |  | 461 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | 424 |  |  |
Net gain | (123) |  |  |
Accumulated Other Comprehensive Income (Loss), net [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net other comprehensive income during the period | 11,654 | 16,920 | (3,824) |
Previously Reported [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period | 5,579 |  |  |
Balance at end of period |  | 5,579 |  |
Previously Reported [Member] | Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period | 4,580 |  |  |
Balance at end of period |  | 4,580 |  |
Previously Reported [Member] | AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period | 634 |  |  |
Balance at end of period |  | 634 |  |
Previously Reported [Member] | Post-Retirement Obligation |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period | $ 365 |  |  |
Balance at end of period |  | $ 365 |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  |  | (7,517) |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 0
Accounting Standards Update 2018-02 [Member] | Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  |  | (7,494) |
Accounting Standards Update 2018-02 [Member] | AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  |  | (370) |
Accounting Standards Update 2018-02 [Member] | Post-Retirement Obligation |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance at beginning of period |  |  | $ 347 |
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss), net [Member] |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ (1,344)

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