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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Basis of Presentation [Line Items] |  |  |
Amortization term for acquisition costs of annuity contracts | 20 years |  |
Amortization term for acquisition costs of indexed universal life contracts | 30 years |  |
Amortization of acquisition costs for individual life contracts, first term | 10 years |  |
Amortization of acquisition costs for individual life contracts, second term | 15 years |  |
Amortization of acquisition costs for individual life contracts, third term | 20 years |  |
Amortization of acquisition costs for individual life contracts, fourth term | 30 years |  |
Amortization of acquisition costs for property and casualty contracts, first term | 6 months |  |
Amortization of acquisition costs for property and casualty contracts, second term | 12 months |  |
Weighted average fair value of nonvested options outstanding | $ 6.65 |  |
Unrecognized share-based compensation expense, nonvested options | $ 2,348 |  |
Antidilutive securities exclude from EPS computation (in shares) | 410,644 |  |
Other comprehensive income (loss), reclassification adjustment from AOCI from sale of securities | $ (16,363) | $ (4,863) | $ 5,176
Other tax expense (benefit) | $ (3,436) | (1,702) | 1,812
Minimum exercise price (in usd per share) | $ 41.95 |  |
Maximum exercise price (in usd per share) | $ 44.75 |  |
Reclassification of deferred taxes |  | 47,900 |
Accounting Standards Update 2016-02 | Pro Forma |  |  |
Basis of Presentation [Line Items] |  |  |
Operating lease liability | $ 14,500 |  |
Employee Stock Option |  |  |
Basis of Presentation [Line Items] |  |  |
Share-based compensation expense | 1,217 | 1,347 | 1,207
Restricted Stock Units |  |  |
Basis of Presentation [Line Items] |  |  |
Share-based compensation expense | 6,638 | 6,459 | $ 6,929
Unrecognized share-based compensation expense, equity instruments other than options | 5,747 |  |
Other policyholder funds |  |  |
Basis of Presentation [Line Items] |  |  |
FHLB Advances | $ 625,000 |  |
HMLIC |  |  |
Basis of Presentation [Line Items] |  |  |
Percentage of reversion to mean approach utilized to amortized policy acquisition costs | 10.00% |  |
FHLB Interest rate | 2.47% |  |
HMLIC | Maturing On September 13, 2019 |  |  |
Basis of Presentation [Line Items] |  |  |
FHLB Advances | $ 250,000 |  |
HMLIC | Maturing On December 15, 2023 |  |  |
Basis of Presentation [Line Items] |  |  |
FHLB Advances | 125,000 |  |
HMLIC | Maturing On January 16, 2026 |  |  |
Basis of Presentation [Line Items] |  |  |
FHLB Advances | 200,000 |  |
HMLIC | Investment Contracts |  |  |
Basis of Presentation [Line Items] |  |  |
FHLB Advances | $ 625,000 |  |
Maximum |  |  |
Basis of Presentation [Line Items] |  |  |
Reserve investment yield assumption life | 3.50% |  |
Minimum |  |  |
Basis of Presentation [Line Items] |  |  |
Reserve investment yield assumption life | 8.00% |  |
Real Estate Property | Maximum |  |  |
Basis of Presentation [Line Items] |  |  |
Property, plant and equipment, useful life | 45 years |  |
Real Estate Property | Minimum |  |  |
Basis of Presentation [Line Items] |  |  |
Property, plant and equipment, useful life | 20 years |  |
Lease hold Improvements And Other Property And Equipment | Maximum |  |  |
Basis of Presentation [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Lease hold Improvements And Other Property And Equipment | Minimum |  |  |
Basis of Presentation [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Interest Sensitive Life Contracts |  |  |
Basis of Presentation [Line Items] |  |  |
Amortization period of acquisition costs of interest sensitive life contracts | 20 years |  |
Deferred policy acquisition costs, impact of unrealized investment gains (losses) | $ 17,862 | 57,995 |
Unrealized Gains and Losses on Fixed Maturity and Equity Securities |  |  |
Basis of Presentation [Line Items] |  |  |
Reclassification of deferred taxes |  | 50,034 |
Defined Benefit Plans |  |  |
Basis of Presentation [Line Items] |  |  |
Reclassification of deferred taxes |  | $ (2,134) |

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