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Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 02, 2019 USD ($) | Dec. 31, 2019 USD ($) security $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Jan. 01, 2019 USD ($)
Basis of Presentation [Line Items] |  |  |  |  |
Restricted cash |  | $ 302 | $ 0 | $ 0 |
Percentage of investment portfolio fair value pricing services or index price |  | 94.10% | 90.70% |  |
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 |  |  |
Amortization of acquisition costs for supplemental policies |  | 6 years |  |  |
Amortization term for acquisition costs of annuity contracts |  | 20 years |  |  |
Amortization period of acquisition costs of interest sensitive life 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 in 2020 |  | $ 14,488 |  |  |
Amortization in 2021 |  | 13,411 |  |  |
Amortization in 2022 |  | 12,433 |  |  |
Amortization in 2023 |  | 11,577 |  |  |
Amortization in 2024 |  | $ 10,805 |  |  |
Percentage of reversion to mean approach utilized to amortized policy acquisition costs |  | 8.00% |  |  |
Deferred policy acquisition costs, corridor around the mean |  | 2.00% |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  | 4.50% |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, percentage, authorized |  | 15.00% |  |  |
Share-based compensation expense |  | $ 5,200 | $ 6,600 | $ 6,500 |
Weighted average fair value of nonvested options outstanding | $ / shares |  | $ 6.42 |  |  |
Unrecognized share-based compensation expense, nonvested options |  | $ 2,400 |  |  |
Antidilutive securities exclude from EPS computation (in shares) | shares |  | 622,500 | 622,500 | 622,500 |
Minimum exercise price (in usd per share) | $ / shares |  | $ 38.05 | $ 38.05 | $ 38.05 |
Maximum exercise price (in usd per share) | $ / shares |  | $ 44.75 | $ 44.75 | $ 44.75 |
Other comprehensive income (loss), reclassification adjustment from AOCI from sale of securities |  | $ 157,423 | $ (16,363) | $ (4,863) |
Other tax expense (benefit) |  | 33,100 | (3,400) | (1,700) |
Reclassification of deferred taxes |  |  |  | 47,900 |
Stranded deferred tax liabilities |  |  |  | 50,000 |
Stranded deferred tax assets |  |  |  | (2,100) |
Cumulative effect of change in accounting principle |  | 0 | (15,041) | 0 |
Lease liability |  | 17,499 |  |  |
Right of use assets, included in Other assets |  | 16,483 |  |  | $ 13,900
Accounting Standards Update 2016-02 | Pro Forma |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Lease liability |  |  |  |  | $ 14,500
Employee stock option |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Share-based compensation expense |  | 1,200 | 1,200 | 1,300 |
Restricted stock units |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Unrecognized share-based compensation expense, equity instruments other than options |  | 6,600 |  |  |
Business acquired |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Value of business acquired |  | 90,700 |  |  |
Amortization in 2020 |  | 7,100 |  |  |
Amortization in 2021 |  | 6,700 |  |  |
Amortization in 2022 |  | 6,200 |  |  |
Amortization in 2023 |  | 5,800 |  |  |
Amortization in 2024 |  | 5,400 |  |  |
HMLIC |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Received from FHLB |  | 175,000 |  |  |
Payments To FHLB |  | $ 305,000 |  |  |
FHLB interest rate |  | 1.87% |  |  |
HMLIC | Maturing On September 11, 2020 |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
FHLB advances |  | $ 125,000 |  |  |
HMLIC | Maturing On November 15, 2023 |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
FHLB advances |  | 20,000 |  |  |
HMLIC | Maturing On December 15, 2023 |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
FHLB advances |  | 100,000 |  |  |
HMLIC | Maturing On January 12, 2024 |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
FHLB advances |  | 50,000 |  |  |
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 |  | $ 495,000 |  |  |
Minimum |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Number of hard-to-value fixed maturity securities | security |  | 100 |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  | 2.00% |  |  |
Maximum |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Number of hard-to-value fixed maturity securities | security |  | 150 |  |  |
Real estate property | Minimum |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 20 years |  |  |
Real estate property | Maximum |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 45 years |  |  |
Lease hold improvements and other property and equipment | Minimum |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 3 years |  |  |
Lease hold improvements and other property and equipment | Maximum |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |
Interest sensitive life contracts |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Deferred policy acquisition costs, impact of unrealized investment gains (losses) |  | $ 41,200 | 17,900 |  |
Retained earnings |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Reclassification of deferred taxes |  | 0 | 0 | (47,900) |
Cumulative effect of change in accounting principle |  | 0 | 15,041 | 0 |
Net unrealized investment gains (losses) on securities |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Reclassification of deferred taxes |  |  |  | $ 50,034 |
Cumulative effect of change in accounting principle |  | 15,000 | $ (15,041) |  |
NTA | Distribution acquired |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Value of distribution acquired |  | 47,500 |  |  |
Amortization in 2020 |  | 2,900 |  |  |
Amortization in 2021 |  | 2,900 |  |  |
Amortization in 2022 |  | 2,900 |  |  |
Amortization in 2023 |  | 2,900 |  |  |
Amortization in 2024 |  | 2,900 |  |  |
NTA | Agency relationships |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Value of agency relationship |  | 15,500 |  |  |
Amortization in 2020 |  | 2,600 |  |  |
Amortization in 2021 |  | 2,200 |  |  |
Amortization in 2022 |  | 1,900 |  |  |
Amortization in 2023 |  | 1,600 |  |  |
Amortization in 2024 |  | 1,400 |  |  |
Benefit Consultants Group Inc. |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Value of business acquired | $ 25,000 |  |  |  |
Benefit Consultants Group Inc. | Distribution acquired |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Value of distribution acquired |  | 4,600 |  |  |
Amortization in 2020 |  | 400 |  |  |
Amortization in 2021 |  | 400 |  |  |
Amortization in 2022 |  | 400 |  |  |
Benefit Consultants Group Inc. | Customer relationships |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Value of customer relationship |  | 7,300 |  |  |
Amortization in 2020 |  | 1,500 |  |  |
Amortization in 2021 |  | 1,200 |  |  |
Amortization in 2022 |  | 1,000 |  |  |
Amortization in 2023 |  | 900 |  |  |
Amortization in 2024 |  | $ 700 |  |  |

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