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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Schedule of Comprehensive Income [Line Items] |  |
Other comprehensive income or loss before reclassifications | $ 2,080 | $ (2,485)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 163 | 45
Other Comprehensive Income, before Tax | 3,007 | (3,273)
Other Comprehensive Income, Tax | (764) | 833
Net current-period other comprehensive income (loss) | 2,243 | (2,440)
Unrealized Gains and Losses on Available for Sale Securities |  |
Schedule of Comprehensive Income [Line Items] |  |
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period Before Tax | 2,788 | (3,332)
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period, Tax | (708) | 847
Other comprehensive income or loss before reclassifications | 2,080 | (2,485)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 0
Net current-period other comprehensive income (loss) | 2,080 | (2,485)
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |
Schedule of Comprehensive Income [Line Items] |  |
Other comprehensive income or loss before reclassifications | 0 | 0
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | 163 | 60
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (42) | (14)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 121 | 46
Net current-period other comprehensive income (loss) | 121 | 46
Accumulated Defined Benefit Plans Adjustment, Net Prior Service |  |
Schedule of Comprehensive Income [Line Items] |  |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | 56 | (1)
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (14) | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 42 | $ (1)

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