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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Componenet (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Loss, Beginning Balance | $ (7,972) | $ (7,166) | $ (4,373)
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) | 1,138 | (806) | (2,793)
Accumulated Other Comprehensive Income (Loss), Net of Tax | (6,834) | (7,972) | (7,166)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Loss, Beginning Balance | 629 | 2,539 | 2,374
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (1,024) | (1,832) | 232
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 13 | (78) | (67)
Other Comprehensive Income (Loss) | (1,011) | (1,910) | 165
Accumulated Other Comprehensive Income (Loss), Net of Tax | (382) | 629 | 2,539
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Loss, Beginning Balance | (7,893) | (9,255) | (6,697)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 1,721 | 848 | (2,846)
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 Other Comprehensive Income (Loss), Net of Tax | (5,737) | (7,893) | (9,255)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Loss, Beginning Balance | (708) | (450) | (50)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | (224) | (347)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7) | (34) | (53)
Other Comprehensive Income (Loss) | (7) | (258) | (400)
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (715) | $ (708) | $ (450)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: 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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- Definition Amount after tax, before 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 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: 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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