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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | $ (338) | $ 0 | $ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (80) | 8 | 7
Other Comprehensive Income (Loss), before Tax | (6,657) | (370) | 2,071
Other Comprehensive Income (Loss), Tax | 1,692 | 335 | (933)
Other Comprehensive Income | (4,965) | (35) | 1,138
Accumulated Net Unrealized Investment Gain (Loss) |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (2,839) | (1,505) | (1,672)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | 723 | 565 | 648
Reclassification from AOCI, Current Period, Tax |  | (111) | (9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (2,116) | (940) | (1,024)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 448 | 22
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (331) | 337 | 13
Other Comprehensive Income | (2,116) | (603) | (1,011)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (3,798) | 287 | 3,017
Reclassification from AOCI, Current Period, Tax | (83) | (49) | (281)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (2,833) | 214 | 1,721
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 325 | 411 | 716
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 242 | 362 | 435
Other Comprehensive Income (Loss) before Reclassifications, Tax | 965 | (73) | (1,296)
Other Comprehensive Income | (2,591) | 576 | 2,156
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (453) |  |
Reclassification from AOCI, Current Period, Tax | (28) | 3 | 5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (338) | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 108 | (11) | (12)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 80 | (8) | (7)
Other Comprehensive Income (Loss) before Reclassifications, Tax | 115 |  |
Other Comprehensive Income | $ (258) | $ (8) | $ (7)

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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale category and out of the held-to-maturity category. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 + Details
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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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