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Summary Of Significant Accounting Policies (Reconciliation of Impact of Adopting ASU 2018-12 on AOCI, Transition Date) (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Jan. 01, 2021
Accounting Policies [Abstract]        
Accumulated other comprehensive income (loss), net of tax $ (740,743,000) $ (767,494,000)    
Cumulative effect of changes in discount rate assumptions (106,019,000)   $ (80,505,000)  
Life and annuity benefits 643,572,000 650,721,000    
Retained earnings 10,818,989,000 9,832,804,000    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings 10,818,989,000 9,832,804,000    
Cumulative effect of changes in discount rate assumptions (106,019,000)   $ (80,505,000)  
Life and annuity benefits 643,572,000 650,721,000    
Accumulated other comprehensive income (loss), net of tax $ (740,743,000) $ (767,494,000)    
Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Accounting Policies [Abstract]        
Accumulated other comprehensive income (loss), net of tax       $ (15,260,000)
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities       119,548,000
Cumulative effect of changes in discount rate assumptions       (138,865,000)
Life and annuity benefits       (19,317,000)
Deferred tax liabilities, net       4,057,000
Retained earnings       0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings       0
Reverse reserve deficiency adjustment related to unrealized gains on underlying investment portfolio of available-for-sale securities       119,548,000
Cumulative effect of changes in discount rate assumptions       (138,865,000)
Life and annuity benefits       (19,317,000)
Deferred tax liabilities, net       4,057,000
Accumulated other comprehensive income (loss), net of tax       $ (15,260,000)