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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)