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Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 22,201 |  |  |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | 11,750 | $ 11,764 | $ 11,764 | $ 11,790 | $ 13,056 | $ 13,011 | $ 13,297
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 0 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 11,681 |  |  |  |  |  |
Accident Year 2017 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 15,264 | 15,273 | 15,538 | 17,078 | 16,109 | $ 15,748 |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 0 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 12,306 |  |  |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 16,819 | 17,157 | 18,027 | 18,386 | $ 19,580 |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 0 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 12,182 |  |  |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 27,831 | 27,316 | 26,316 | $ 22,138 |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 1,663 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 12,026 |  |  |  |  |  |
Accident Year 2020 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 17,107 | 17,485 | $ 20,671 |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 3,653 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 11,530 |  |  |  |  |  |
Accident Year 2021 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 25,337 | $ 28,982 |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 5,809 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 14,150 |  |  |  |  |  |
Accident Year 2022 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 27,570 |  |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 11,076 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | 12,860 |  |  |  |  |  |

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- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4E -URI https://asc.fasb.org/extlink&oid=116884468&loc=SL65671321-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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