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Loss and loss adjustment expense reserves Loss and loss adjustment expense reserves (claims development triangles) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Claims Development [Line Items] |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 1,099,434 |  |  |  |  |  |  |
Multi-line |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 624,836 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 269,068 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 338,068 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 286,768 |  |  |  |  |  |  |
Multi-line | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Multi-line | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,564 | 4,564 | 4,564 | 4,564 | 4,564 | 4,272 | 9 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 4,563 | 4,563 | 4,563 | 4,563 | 4,563 | 1,243 | 0 |
Multi-line | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 37,759 | 37,547 | 35,747 | 40,095 | 35,651 | 47,493 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 16,870 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 20,822 | 20,536 | 18,803 | 20,782 | 14,242 | 1,179 |  |
Multi-line | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 116,499 | 107,292 | 106,957 | 108,581 | 86,003 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 37,445 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 78,443 | 76,564 | 73,844 | 65,309 | 30,620 |  |  |
Multi-line | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 124,262 | 116,702 | 120,774 | 119,902 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 35,944 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 87,192 | 84,047 | 76,034 | 30,640 |  |  |  |
Multi-line | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 110,994 | 107,485 | 100,304 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 30,137 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 79,660 | 74,191 | 53,789 |  |  |  |  |
Multi-line | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 101,510 | 90,463 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 43,334 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 48,060 | 30,497 |  |  |  |  |  |
Multi-line | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 129,248 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 105,338 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 19,328 |  |  |  |  |  |  |
Credit & Financial Lines |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 47,464 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 26,552 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 15,768 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 31,696 |  |  |  |  |  |  |
Credit & Financial Lines | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Credit & Financial Lines | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 80 | 77 | 99 | 107 | 113 | 408 | 364 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 77 | 77 | 78 | 74 | 66 | 11 | 0 |
Credit & Financial Lines | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 1,454 | 1,384 | 2,203 | 2,416 | 2,643 | 5,774 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 95 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 1,344 | 1,322 | 1,318 | 1,038 | 784 | 42 |  |
Credit & Financial Lines | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 3,127 | 4,007 | 4,752 | 5,032 | 5,234 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 517 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 2,503 | 2,328 | 2,045 | 1,128 | 402 |  |  |
Credit & Financial Lines | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 6,560 | 10,816 | 10,721 | 10,726 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,751 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 4,196 | 3,419 | 2,326 | 1,013 |  |  |  |
Credit & Financial Lines | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 7,313 | 13,773 | 13,740 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 3,364 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 3,031 | 2,332 | 1,100 |  |  |  |  |
Credit & Financial Lines | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 10,940 | 17,715 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 6,482 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 2,717 | 897 |  |  |  |  |  |
Credit & Financial Lines | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 17,990 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 14,341 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 1,900 |  |  |  |  |  |  |
Other Casualty |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 397,761 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 270,429 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 71,410 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 326,351 |  |  |  |  |  |  |
Other Casualty | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Other Casualty | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Other Casualty | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 5,849 | 5,584 | 4,903 | 7,316 | 7,519 | 5,480 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,302 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 3,685 | 3,104 | 2,226 | 1,390 | 340 | 16 |  |
Other Casualty | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 38,970 | 37,113 | 33,396 | 48,315 | 45,558 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 10,435 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 20,550 | 15,781 | 9,053 | 3,612 | 310 |  |  |
Other Casualty | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 56,774 | 54,990 | 52,118 | 63,082 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 23,647 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 20,783 | 13,467 | 6,165 | 621 |  |  |  |
Other Casualty | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 75,334 | 71,091 | 70,158 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 48,072 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 12,798 | 6,231 | 1,418 |  |  |  |  |
Other Casualty | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 124,859 | 120,553 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 99,737 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 9,968 | 1,674 |  |  |  |  |  |
Other Casualty | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 95,975 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 87,236 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 3,626 |  |  |  |  |  |  |
Non-Standard Auto Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 433,001 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 14,526 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 406,534 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 26,467 |  |  |  |  |  |  |
Non-Standard Auto Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 11,349 | 11,356 | 11,333 | 11,433 | 11,534 | 11,777 | 12,264 | 13,247
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 11,349 | 11,348 | 11,318 | 11,382 | 11,450 | 11,387 | 9,989 | 5,619
Non-Standard Auto Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 19,489 | 19,534 | 19,483 | 19,338 | 19,472 | 19,990 | 20,830 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 7 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 19,479 | 19,463 | 19,363 | 19,066 | 18,686 | 17,244 | 8,673 |
Non-Standard Auto Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 103,623 | 103,822 | 103,661 | 103,568 | 103,473 | 104,896 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 53 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 103,515 | 103,379 | 102,868 | 101,626 | 97,651 | 45,766 |  |
Non-Standard Auto Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 89,241 | 89,459 | 89,550 | 88,705 | 82,677 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 119 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 88,630 | 88,168 | 86,100 | 80,765 | 42,451 |  |  |
Non-Standard Auto Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 86,511 | 86,434 | 85,903 | 77,785 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 343 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 85,027 | 82,556 | 77,511 | 38,059 |  |  |  |
Non-Standard Auto Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 50,698 | 50,793 | 48,682 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 809 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 48,665 | 45,196 | 23,546 |  |  |  |  |
Non-Standard Auto Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 43,039 | 45,145 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,602 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 38,918 | 21,182 |  |  |  |  |  |
Non-Standard Auto Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 29,051 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 11,593 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 10,951 |  |  |  |  |  |  |
Workers’ Compensation |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 228,349 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 47,466 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 145,318 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 83,031 |  |  |  |  |  |  |
Workers’ Compensation | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 5,938 | 5,874 | 5,720 | 5,715 | 5,596 | 5,066 | 4,534 | 4,037
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 6 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 5,347 | 5,110 | 4,796 | 4,969 | 4,280 | 3,017 | 624 | 93
Workers’ Compensation | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 32,741 | 33,067 | 33,252 | 33,449 | 33,365 | 28,616 | 27,449 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 286 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 30,377 | 29,082 | 26,956 | 22,826 | 16,840 | 9,142 | 2,587 |
Workers’ Compensation | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 41,115 | 42,037 | 43,470 | 47,200 | 46,568 | 40,247 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,699 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 36,262 | 34,112 | 29,573 | 24,280 | 15,947 | 4,073 |  |
Workers’ Compensation | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 31,116 | 32,529 | 34,800 | 37,138 | 35,749 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2,723 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 24,942 | 22,432 | 17,001 | 10,755 | 2,669 |  |  |
Workers’ Compensation | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 31,047 | 36,475 | 39,205 | 40,433 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 4,159 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 21,754 | 18,346 | 13,236 | 3,985 |  |  |  |
Workers’ Compensation | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 34,453 | 40,459 | 41,075 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 9,205 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 16,908 | 11,868 | 4,586 |  |  |  |  |
Workers’ Compensation | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 25,050 | 27,753 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 10,630 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 7,089 | 2,552 |  |  |  |  |  |
Workers’ Compensation | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 26,889 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 18,758 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 2,639 |  |  |  |  |  |  |
Other Property |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 329,464 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 48,863 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 269,327 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 60,137 |  |  |  |  |  |  |
Other Property | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 9,490 | 9,501 | 9,472 | 9,416 | 9,353 | 9,375 | 8,672 | 10,917
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 9,483 | 9,482 | 9,400 | 9,352 | 9,186 | 9,075 | 8,381 | 4,656
Other Property | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 26,051 | 26,170 | 25,785 | 25,882 | 25,766 | 24,980 | 27,765 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 7 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 25,993 | 25,815 | 25,406 | 25,167 | 24,023 | 22,229 | 14,635 |
Other Property | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 46,303 | 46,500 | 44,627 | 41,336 | 40,920 | 40,256 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 725 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 45,312 | 44,533 | 42,775 | 38,448 | 34,381 | 19,420 |  |
Other Property | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 56,201 | 56,313 | 54,635 | 52,533 | 50,330 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,533 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 53,924 | 51,783 | 48,360 | 43,382 | 22,706 |  |  |
Other Property | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 43,733 | 43,799 | 43,038 | 45,415 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2,906 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 39,651 | 37,044 | 31,871 | 21,593 |  |  |  |
Other Property | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 41,753 | 41,833 | 41,237 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 3,120 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 37,171 | 33,436 | 24,713 |  |  |  |  |
Other Property | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 52,343 | 54,084 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 14,267 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 35,169 | 26,458 |  |  |  |  |  |
Other Property | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 53,590 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 26,305 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 22,624 |  |  |  |  |  |  |
Other Property |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 39,251 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 38,529 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 470 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 38,781 |  |  |  |  |  |  |
Other Property | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Other Property | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Other Property | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other Property | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Other Property | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 |  |  |  |
Other Property | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Other Property | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 |  |  |  |  |  |
Other Property | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 39,251 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 38,529 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 470 |  |  |  |  |  |  |
Other Specialty |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 93,898 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 11,069 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 77,554 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 16,344 |  |  |  |  |  |  |
Other Specialty | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 50,104 | 50,104 | 50,104 | 50,065 | 50,055 | 50,055 | 49,942 | 52,105
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 50,103 | 50,103 | 50,103 | 50,067 | 50,025 | 50,024 | 48,455 | $ 2,666
Other Specialty | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 23,125 | 23,138 | 23,135 | 23,138 | 23,450 | 24,274 | 25,582 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 23,127 | 23,137 | 23,135 | 23,134 | 23,138 | 22,232 | 0 |
Other Specialty | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other Specialty | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Other Specialty | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 730 | 812 | 0 | 0 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 691 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 |  |  |  |
Other Specialty | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,025 | 3,544 | 4,033 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 447 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 575 | 261 | 4 |  |  |  |  |
Other Specialty | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 6,866 | 6,213 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2,573 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 2,109 | 957 |  |  |  |  |  |
Other Specialty | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 9,048 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 7,358 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 1,640 |  |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 67,151 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,835 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 65,316 |  |  |  |  |  |  |
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented | 1,835 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 208 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 2,043 |  |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2010 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 147 | 221 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 140 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 7 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2011 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 131 | 200 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 128 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 3 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 367 | 442 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 103 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 264 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 2,007 | 2,230 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 148 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 1,859 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 5,288 | 5,809 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 241 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 5,047 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 11,692 | 12,754 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 331 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 11,361 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 17,871 | 19,431 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 364 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 17,507 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 15,889 | 17,257 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 279 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 15,610 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 13,759 | 14,880 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 101 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 13,658 | 0 |  |  |  |  |  |
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 |  |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 61,952 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 61,952 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented | 61,952 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 256 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 62,208 |  |  |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2010 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 237 | 371 | 442 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 237 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2011 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 966 | 1,567 | 1,648 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 966 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 1,295 | 2,110 | 2,185 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,295 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 2,000 | 3,264 | 3,358 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2,000 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 5,768 | 9,453 | 9,582 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 5,768 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 7,570 | 12,398 | 12,597 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 7,570 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 14,397 | 23,617 | 23,854 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 14,397 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 29,719 | 48,888 | 48,877 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 29,719 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 |  |  |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 41,849 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 41,849 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented | 41,849 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 1,757 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 43,606 |  |  |  |  |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2010 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 2,225 | 3,561 | 3,932 | 5,324 | 5,324 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2,225 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2011 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,509 | 7,318 | 7,703 | 10,165 | 10,165 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 4,509 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 6,817 | 11,132 | 11,470 | 14,952 | 14,952 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 6,817 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 8,432 | 13,779 | 14,162 | 18,435 | 18,435 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 8,432 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 18,953 | 31,098 | 31,500 | 40,654 | 40,654 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 18,953 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 913 | 1,395 | 1,788 | 2,596 | 2,596 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 913 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 |  |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 18,045 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 18,045 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented | 18,045 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 0 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 18,045 |  |  |  |  |  |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2010 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 444 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2011 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 1,529 | 2,884 | 3,252 | 3,057 | 3,455 | 4,239 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,529 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,778 | 9,011 | 10,162 | 9,553 | 10,794 | 12,173 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 4,778 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 7,493 | 14,132 | 15,938 | 14,982 | 16,929 | 18,907 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 7,493 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,245 | 8,005 | 9,028 | 8,487 | 9,590 | 10,700 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 4,245 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 16,509 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 16,509 |  |  |  |  |  |  |
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented | 0 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 9,524 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 9,524 |  |  |  |  |  |  |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2010 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 704 | 704 | 704 | 704 | 704 | 704 | 914 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 704 | 704 | 704 | 704 | 704 | 279 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2011 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,173 | 4,173 | 4,173 | 4,173 | 4,173 | 4,173 | 5,419 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 4,173 | 4,173 | 4,173 | 4,173 | 4,173 | 1,654 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 7,853 | 7,853 | 7,853 | 7,853 | 7,853 | 7,853 | 10,197 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 7,853 | 7,853 | 7,853 | 7,853 | 7,853 | 3,113 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 3,779 | 3,779 | 3,779 | 3,779 | 3,779 | 3,779 | 4,908 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 3,779 | 3,779 | 3,779 | 3,779 | 3,779 | 1,498 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 0 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 92,790 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 92,790 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented | 92,790 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 1,643 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 94,433 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2010 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 945 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 945 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2011 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 2,064 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 2,064 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2012 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 1,211 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,211 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2013 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 1,983 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 1,983 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2014 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 4,328 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 4,328 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2015 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 6,197 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 6,197 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2016 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 10,858 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 10,858 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2017 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 12,908 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 12,908 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2018 |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 16,769 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 16,769 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | 0 |  |  |  |  |  |  |
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Loss and loss adjustment expenses incurred, net | 35,527 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | 35,527 |  |  |  |  |  |  |
Cumulative net losses and loss adjustment expenses paid | $ 0 |  |  |  |  |  |  |

X
- Definition Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after reinsurance, of paid 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 (b) -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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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 http://asc.fasb.org/extlink&oid=99384497&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 http://asc.fasb.org/extlink&oid=99384497&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 http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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