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Basis of Presentation and Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
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 |  |  |  |
Percentage of reversion to mean approach utilized to amortized policy acquisition costs |  | 8.00% |  |  |  |
Deferred policy acquisition costs, corridor around the mean |  | 2.00% |  |  |  |
Amortization in 2021 |  | $ 13,067 |  |  |  |
Amortization in 2022 |  | 12,070 |  |  |  |
Amortization in 2023 |  | 11,232 |  |  |  |
Amortization in 2024 |  | 10,480 |  |  |  |
Amortization in 2025 |  | 9,811 |  |  |  |
Goodwill impairment |  | $ 5,625 |  |  |  |
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% |  |  |
FHLB advances |  | $ 590,500 |  |  |  |
Share-based compensation expense |  | $ 4,800 | $ 5,200 | $ 6,600 |  |
Weighted average fair value of nonvested options outstanding (in usd per share) |  | $ 6.31 |  |  |  |
Unrecognized share-based compensation expense, nonvested options |  | $ 2,100 |  |  |  |
Antidilutive securities exclude from EPS computation (in shares) |  | 713,080 | 713,080 | 713,080 | 713,080 |
Minimum exercise price (in usd per share) |  | $ 38.05 | $ 38.05 | $ 38.05 | $ 38.05 |
Maximum exercise price (in usd per share) |  | $ 42.95 | $ 42.95 | $ 42.95 | $ 42.95 |
Stockholders' equity |  | $ 1,790,079 | $ 1,567,285 | $ 1,290,550 |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  | 0 | 0 | $ (15,041) |
Retained earnings |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Stockholders' equity |  | 1,434,634 | 1,352,539 | 1,216,582 | 1,231,177 |
Retained earnings | Cumulative effect of change in accounting principle |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  | (509) |  | $ 15,041 | $ (500)
Employee stock option |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Share-based compensation expense |  | 1,100 | 1,200 | 1,200 |  |
Restricted stock units |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Unrecognized share-based compensation expense, equity instruments other than options |  | 6,500 |  |  |  |
HMLIC and NTA |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Proceeds from FHLB funding agreements |  | $ 95,500 |  |  |  |
Minimum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  | 2.00% |  |  |  |
Real estate property | Minimum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  | 20 years |  |  |  |
Real estate property | Maximum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  | 45 years |  |  |  |
Lease hold improvements and other property and equipment | Minimum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  | 3 years |  |  |  |
Lease hold improvements and other property and equipment | Maximum |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |  |  |
Benefit Consultants Group Inc. |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Impairment charges of intangible assets | $ 4,400 |  |  |  |  |
Goodwill impairment | $ 5,600 |  |  |  |  |
Value of business acquired |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Value of business acquired |  | $ 83,600 |  |  |  |
Amortization in 2021 |  | 6,600 |  |  |  |
Amortization in 2022 |  | 6,200 |  |  |  |
Amortization in 2023 |  | 5,800 |  |  |  |
Amortization in 2024 |  | 5,400 |  |  |  |
Amortization in 2025 |  | 5,100 |  |  |  |
Value of distribution acquired | NTA |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Amortization in 2021 |  | 2,900 |  |  |  |
Amortization in 2022 |  | 2,900 |  |  |  |
Amortization in 2023 |  | 2,900 |  |  |  |
Amortization in 2024 |  | 2,900 |  |  |  |
Amortization in 2025 |  | 2,900 |  |  |  |
Value of distribution acquired |  | 44,700 |  |  |  |
Value of distribution acquired | Benefit Consultants Group Inc. |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Amortization in 2022 |  | 300 |  |  |  |
Amortization in 2023 |  | 300 |  |  |  |
Amortization in 2024 |  | 300 |  |  |  |
Amortization in 2025 |  | 300 |  |  |  |
Value of distribution acquired |  | 700 |  |  |  |
Value of agency relationships | NTA |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Amortization in 2021 |  | 2,200 |  |  |  |
Amortization in 2022 |  | 1,900 |  |  |  |
Amortization in 2023 |  | 1,600 |  |  |  |
Amortization in 2024 |  | 1,400 |  |  |  |
Amortization in 2025 |  | 1,200 |  |  |  |
Value of agency relationship |  | 12,900 |  |  |  |
Value of customer relationships | Benefit Consultants Group Inc. |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Amortization in 2021 |  | 1,200 |  |  |  |
Amortization in 2022 |  | 1,100 |  |  |  |
Amortization in 2023 |  | 900 |  |  |  |
Amortization in 2024 |  | 700 |  |  |  |
Amortization in 2025 |  | 600 |  |  |  |
Value of customer relationship |  | 5,900 |  |  |  |
Interest sensitive life contracts |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs, impact of unrealized investment gains (losses) |  | $ 90,500 | $ 41,200 | $ 17,900 |  |

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