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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | $ 697 | $ (1,208) | $ (2,961)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 441 | 402 | 168
Other Comprehensive Income (Loss), before Tax | 2,071 | (1,329) | (4,547)
Other Comprehensive Income (Loss), Tax | (933) | 523 | 1,754
Other Comprehensive Income (Loss) | 1,138 | (806) | (2,793)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (1,672) | (3,017) | 356
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit | 648 | 1,185 | (124)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (1,024) | (1,832) | 232
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 22 | (129) | (110)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (9) | 51 | 43
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 13 | (78) | (67)
Other Comprehensive Income (Loss) | (1,011) | (1,910) | 165
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 3,017 | 1,395 | (4,610)
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit | (1,296) | (547) | 1,764
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 1,721 | 848 | (2,846)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 716 | 846 | 474
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (281) | (332) | (186)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 435 | 514 | 288
Other Comprehensive Income (Loss) | 2,156 | 1,362 | (2,558)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | (368) | (570)
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit | 0 | 144 | 223
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | (224) | (347)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (12) | (56) | (87)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | 5 | 22 | 34
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7) | (34) | (53)
Other Comprehensive Income (Loss) | $ (7) | $ (258) | $ (400)

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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=66004124&loc=SL7669686-108580 + Details
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