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Unpaid Claims and Claim Expenses - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Gross reserves, end of year | $ 438,754 | $ 442,854
Property and Casualty segment |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 241,182 |
Reinsurance recoverables, including reinsurance premium paid | 112,881 |
Unallocated claims adjustment expenses | 18,090 |
Total other than short duration and unallocated claims adjustment expenses | 84,691 |
Property and Casualty segment | Homeowners |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 55,533 |
Reinsurance recoverables, including reinsurance premium paid | 6,386 |
Property and Casualty segment | Automobile liability |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 179,749 |
Reinsurance recoverables, including reinsurance premium paid | 99,717 |
Property and Casualty segment | Automobile physical damage |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 2,711 |
Property and Casualty segment | Other short duration lines |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 3,189 |
Reinsurance recoverables, including reinsurance premium paid | 6,778 |
Property and Casualty segment | Insurance lines other than short duration |  |
Short-duration Insurance Contracts, Historical Claims Duration [Line Items] |  |
Insurance lines other than short duration | $ 66,601 |

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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