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Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | $ (11,341) |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 0
Other comprehensive income (loss) before reclassification adjustment | $ 2,489 | $ (4,252) | 17,423 | $ (6,876) |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (98) | 156 | 7 | 130 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | 0 | 0 | 7 |  |
Total other comprehensive (loss) income | 2,384 | (4,096) | 17,418 | (13,140) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 6,077 |  | 6,077 |  |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | (11,697) | (7,510) |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | (1,344)
Other comprehensive income (loss) before reclassification adjustment | 2,489 | (4,252) | 17,423 | (6,876) |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (7) | 0 | (12) | (6,401) |  |
Total other comprehensive (loss) income | 2,482 | (4,252) | 17,411 | (13,277) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 5,714 | (20,787) | 5,714 | (20,787) |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | 461 | 299 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | 0
Other comprehensive income (loss) before reclassification adjustment | 0 | 0 | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |
Total other comprehensive (loss) income | 0 | 0 | 0 | 0 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 461 | 299 | 461 | 299 |  |
Derivative [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | (105) | (306) |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | 0
Total other comprehensive (loss) income | (98) | 156 | 7 | 137 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (98) | (169) | (98) | (169) |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  |  | (11,341) | (7,517) |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ (1,344)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 2,391 | (4,096) | 17,430 | (6,746) |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (7) | 0 | (12) | (6,394) |  |
Total other comprehensive (loss) income | 2,384 | (4,096) | 17,418 | (13,140) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 6,077 | (20,657) | 6,077 | (20,657) |  |
Previously Reported [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 3,232 | (16,535) | (11,697) | (6,166) |  |
Previously Reported [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 461 | 299 | 461 | 299 |  |
Previously Reported [Member] | Derivative [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 0 | (325) | (105) | (306) |  |
Previously Reported [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ 3,693 | $ (16,561) | $ (11,341) | $ (6,173) |  |
Effect of ASU Adoption [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 0 |
Effect of ASU Adoption [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 0 |
Effect of ASU Adoption [Member] | Derivative [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 0 |
Effect of ASU Adoption [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 0 |

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