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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
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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)

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