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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