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Summary of Significant Accounting Policies Deferred Acquisition Costs and Cost of Customer Relationships Acquired (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Deferred Policy Acquisition Costs and Cost of Customer Relationship Acquired [Abstract]      
First year commissions, percentage of capitalized deferred acquisition costs   95.00%  
New business expense, percentage of capitalized deferred acquisition costs   5.00%  
Number of years of available premiums   50 years  
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of period   $ 140,380 $ 104,913
Capitalization of deferred policy acquisition costs   24,899 22,740
Amortization of deferred policy acquisition costs   (26,529) (24,952)
Effect of Unrealized (gains) losses   1,417 37,679
Balance at end of period   140,167 140,380
Change in Accounting Estimate [Line Items]      
Liability for Future Policy Benefits, Life   (1,305,506) (1,278,987)
Amortization of deferred policy acquisition costs   $ 26,529 $ 24,952
Unusual or Infrequent Item, or Both [Member]      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Amortization of deferred policy acquisition costs $ (100)    
Change in Accounting Estimate [Line Items]      
Income (loss) before income tax expense 700    
Liability for Future Policy Benefits, Life (800)    
Amortization of deferred policy acquisition costs $ 100