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Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 0
Balance at beginning of period | $ (11,341) | $ (6,173) | (7,027)
Other comprehensive income before reclassification adjustment | 17,033 | 2,456 | 3,979
Amounts reclassified from accumulated other comprehensive income (loss) | (17) | (6,394) | (3,199)
Net gain | (96) | 114 | 74
Net other comprehensive income during the period | 16,920 | (3,824) | 854
Balance at end of period | 5,579 | (11,341) | (6,173)
Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | (1,328)
Balance at beginning of period |  | (6,166) | (7,455)
Other comprehensive income before reclassification adjustment | 16,294 | 2,198 | 4,565
Amounts reclassified from accumulated other comprehensive income (loss) | (17) | (6,401) | (3,276)
Net other comprehensive income during the period | 16,277 | (4,203) | 1,289
Balance at end of period | 4,580 |  | (6,166)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | (64)
Balance at beginning of period |  | (306) | 203
Other comprehensive income before reclassification adjustment | 739 | 258 | (586)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 7 | 77
Net other comprehensive income during the period | 739 | 265 | (509)
Balance at end of period | 634 |  | (306)
Post-Retirement Obligation |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 48
Balance at beginning of period |  | 299 | 225
Net gain | (96) | 114 | 74
Net other comprehensive income during the period | (96) | 114 | 74
Balance at end of period | 365 |  | 299
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)
Net other comprehensive income during the period | 16,920 | (3,824) | 854
Previously Reported [Member] |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | (11,341) |  |
Balance at end of period |  | (11,341) |
Previously Reported [Member] | Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | (11,697) |  |
Balance at end of period |  | (11,697) |
Previously Reported [Member] | AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | (105) |  |
Balance at end of period |  | (105) |
Previously Reported [Member] | Post-Retirement Obligation |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | $ 461 |  |
Balance at end of period |  | 461 |
Accounting Standards Update 2018-02 [Member] |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period |  | (7,517) |
Balance at end of period |  |  | (7,517)
Accounting Standards Update 2018-02 [Member] | Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period |  | (7,494) |
Balance at end 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) |
Balance at end of period |  |  | (370)
Accounting Standards Update 2018-02 [Member] | Post-Retirement Obligation |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period |  | $ 347 |
Balance at end of period |  |  | $ 347

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