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Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (6,173) |  |  |
Other comprehensive income (loss) before reclassification adjustment | (3,145) | $ 1,653 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (103) | (335) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | (50) |  |
Total other comprehensive (loss) income | (5,492) | 944 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (13,009) |  |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (7,510) | (7,455) |  |
Other comprehensive income (loss) before reclassification adjustment | (3,145) | 1,653 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (2,244) | (424) |  |
Total other comprehensive (loss) income | (5,389) | 1,229 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (12,899) | (6,226) |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 299 | 225 |  |
Other comprehensive income (loss) before reclassification adjustment | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 |  |
Total other comprehensive (loss) income | 0 | 0 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 299 | 225 |  |
Derivative [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (306) | 203 |  |
Total other comprehensive (loss) income | (103) | (285) |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (409) | (82) |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (7,517) | (7,027) |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (3,248) | 1,318 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (2,244) | (374) |  |
Total other comprehensive (loss) income | (5,492) | 944 |  |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (13,009) | (6,083) |  |
Scenario, Previously Reported [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (6,166) | (7,455) |  |
Scenario, Previously Reported [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 299 | 225 |  |
Scenario, Previously Reported [Member] | Derivative [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (306) | 203 |  |
Scenario, Previously Reported [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (6,173) | $ (7,027) |  |
Effect of ASU Adoption [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 0 | $ 0
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 |  |  | (1,344) | 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 | 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 |  |  | $ (1,344) | $ 0

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