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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |
Other Comprehensive Income, before Tax | $ (695) |  | $ 844 |  | $ (3,968) | $ 1,096
Other Comprehensive Income, Tax | 176 |  | (364) |  | 1,009 | (462)
Net current-period other comprehensive income (loss) | (519) |  | 480 |  | (2,959) | 634
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 | (853) |  | 666 |  | (4,185) | 743
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period, Tax | 218 |  | (257) |  | 1,065 | (287)
Other comprehensive income or loss before reclassifications | (635) |  | 409 | [1] | (3,120) | 456
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | [1] | 0 | [1] | 0 | 0
Net current-period other comprehensive income (loss) | (635) | [1] | 409 | [1] | (3,120) | 456
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |
Other comprehensive income or loss before reclassifications | 0 | [1] | 0 | [1] | 0 | 0
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | 103 |  | 181 |  | 163 | 359
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (28) |  | (109) |  | (42) | (178)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 75 | [1] | 72 | [1] | 121 | 181
Net current-period other comprehensive income (loss) | 75 | [1] | 72 | [1] | 121 | 181
Accumulated Defined Benefit Plans Adjustment, Net Prior Service |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | 55 |  | (3) |  | 54 | (6)
Reclassification from Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (14) |  | 2 |  | (14) | 3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 41 |  | $ (1) |  | $ 40 | $ (3)
[1] | All amounts are net of tax.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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