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Acquisition of Tokio Millennium Re (Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - TMR |  | 12 Months Ended
--- | --- | ---
Mar. 22, 2019 USD ($) state | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Excess purchase price over the fair value of net assets acquired assigned to goodwill | $ 13,094,000 |  |
Finite-lived intangible assets | $ 11,200,000 |  |
Acquired finite-lived intangibles, weighted average amortization period | 10 years 6 months |  |
Indefinite lived | $ 6,800,000 | $ 0 |
Value of business acquired, amortization period | 2 years |  |
Value of business acquired | $ 287,600,000 |  |
Impairment loss |  | $ 6,800,000 |
Deferred tax liability related to the estimated fair value of the intangible assets recorded | 2,281,000 |  |
Deferred tax liability related to other adjustments | $ 2,606,000 |  |
Insurance licenses |  |  |
Business Acquisition [Line Items] |  |  |
Number of states, ability to write reinsurance | state | 50 |  |
Impairment loss |  |  | $ 6,800,000

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