Loss and Loss Expense Reserves, Incurred Claims Development, Net of Reinsurance (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($) Claim		Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Liabilities for claims and claims adjustment expenses, net of reinsurance		$ 641,131		$ 567,630
Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		395,314
Total of incurred-but-not-reported liabilities plus expected development on reported claims		91,001
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		243,291
Outstanding liabilities prior to 2011, net of reinsurance		16,836
Liabilities for claims and claims adjustment expenses, net of reinsurance		168,859		154,409
Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		1,025,880
Total of incurred-but-not-reported liabilities plus expected development on reported claims		211,152
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		608,615
Outstanding liabilities prior to 2011, net of reinsurance		3,433
Liabilities for claims and claims adjustment expenses, net of reinsurance		420,698		355,148
Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		75,161
Total of incurred-but-not-reported liabilities plus expected development on reported claims		6,122
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		63,737
Outstanding liabilities prior to 2011, net of reinsurance		534
Liabilities for claims and claims adjustment expenses, net of reinsurance		11,958		16,079
Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		73,929
Total of incurred-but-not-reported liabilities plus expected development on reported claims		4,771
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		58,989
Outstanding liabilities prior to 2011, net of reinsurance		99
Liabilities for claims and claims adjustment expenses, net of reinsurance		15,039		19,840
Physical Damage [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	[1]	160,495
Total of incurred-but-not-reported liabilities plus expected development on reported claims	[1]	$ 3,396
Short-duration insurance contract, claims settlement period		2 years
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance	[1]	$ 146,011
Outstanding liabilities prior to 2011, net of reinsurance	[1]	77
Liabilities for claims and claims adjustment expenses, net of reinsurance		14,561	[1]	11,676
Accident Year 2011 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		26,356		26,452	$ 26,631	$ 26,617	$ 27,293	$ 25,515	$ 26,767	$ 26,958	$ 26,628	$ 26,057
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 1,989
Number of reported claims per year | Claim		4,547
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 23,516		23,366	22,991	22,569	21,622	20,617	18,884	15,973	11,912	4,916
Accident Year 2011 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		38,773		37,795	37,852	36,076	37,122	35,805	36,894	31,633	43,832	46,829
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 21
Number of reported claims per year | Claim		2,902
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 37,267		37,263	36,400	35,561	34,009	33,255	30,795	23,615	11,350	1,809
Accident Year 2011 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		13,228		13,018	12,725	12,744	12,735	10,779	9,859	9,017	8,314	10,492
Total of incurred-but-not-reported liabilities plus expected development on reported claims		219
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		12,629		12,404	12,280	11,679	10,404	8,104	4,983	2,061	637	50
Accident Year 2011 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		6,275		6,287	6,263	6,264	6,297	6,151	6,283	6,485	6,937	6,249
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 2
Number of reported claims per year | Claim		472
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 6,267		6,246	6,232	6,219	6,278	6,020	6,050	6,003	4,861	$ 2,159
Accident Year 2012 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		26,397		25,508	26,775	27,020	25,616	24,485	24,887	25,544	23,965
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 2,327
Number of reported claims per year | Claim		4,484
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 21,850		21,636	21,157	20,276	18,946	17,415	14,834	11,004	4,597
Accident Year 2012 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		51,830		51,962	51,648	51,475	48,708	51,367	49,743	54,269	49,743
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 443
Number of reported claims per year | Claim		3,131
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 50,908		50,882	50,750	50,036	47,601	45,303	32,942	23,252	3,086
Accident Year 2012 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		16,439		16,013	14,949	16,555	14,605	10,157	5,569	9,276	10,041
Total of incurred-but-not-reported liabilities plus expected development on reported claims		489
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		14,403		13,706	13,091	11,239	8,355	5,077	2,388	992	103
Accident Year 2012 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		3,758		3,773	3,551	3,566	3,585	3,758	3,908	4,168	5,272
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 8
Number of reported claims per year | Claim		380
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 3,555		3,521	3,482	3,442	3,377	3,390	3,190	2,648	$ 1,082
Accident Year 2013 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		31,360		31,066	31,131	32,553	32,121	29,913	30,638	27,619
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 3,137
Number of reported claims per year | Claim		5,282
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 26,702		25,847	24,968	23,643	21,655	18,065	12,792	4,880
Accident Year 2013 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		51,293		51,598	48,857	46,690	36,371	37,701	39,143	53,817
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 270
Number of reported claims per year | Claim		3,753
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 49,879		49,522	46,084	44,865	34,481	25,270	15,772	5,167
Accident Year 2013 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		23,381		23,474	22,213	23,256	17,694	11,618	13,034	14,370
Total of incurred-but-not-reported liabilities plus expected development on reported claims		1,764
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		20,157		19,201	18,229	14,779	10,988	5,088	1,135	123
Accident Year 2013 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		4,082		4,082	4,107	4,166	4,390	4,403	5,044	6,410
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 0
Number of reported claims per year | Claim		337
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 4,082		4,082	4,107	4,110	4,108	3,768	3,565	$ 1,989
Accident Year 2014 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		31,551		31,579	31,031	33,427	34,009	36,968	36,768
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 3,772
Number of reported claims per year | Claim		5,413
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 25,507		24,714	23,968	22,387	19,075	13,665	5,328
Accident Year 2014 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		72,636		70,841	64,372	52,964	52,483	52,254	49,971
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 1,051
Number of reported claims per year | Claim		3,325
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 69,183		68,392	57,692	45,075	28,393	9,046	4,023
Accident Year 2014 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		10,619		10,721	12,749	9,837	7,259	8,825	12,675
Total of incurred-but-not-reported liabilities plus expected development on reported claims		1,256
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		8,890		7,732	6,627	3,999	2,241	761	723
Accident Year 2014 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		4,041		4,061	4,031	4,093	4,147	4,865	5,283
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 38
Number of reported claims per year | Claim		325
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 3,968		3,968	3,948	3,909	3,861	3,685	$ 2,000
Accident Year 2015 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		25,167		25,436	24,948	25,889	23,115	26,277
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 3,367
Number of reported claims per year | Claim		6,340
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 20,251		19,385	17,487	15,020	10,128	2,918
Accident Year 2015 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		77,225		75,503	71,088	64,323	70,174	61,420
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 1,736
Number of reported claims per year | Claim		3,198
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 74,276		71,697	63,133	49,267	27,582	10,923
Accident Year 2015 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		8,404		8,753	10,422	7,147	7,859	11,638
Total of incurred-but-not-reported liabilities plus expected development on reported claims		1,959
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		5,162		3,964	3,207	1,899	390	10
Accident Year 2015 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		3,698		3,832	3,846	3,715	3,539	3,897
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 111
Number of reported claims per year | Claim		275
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 3,285		3,224	2,988	2,670	1,934	$ 739
Accident Year 2016 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		29,785		30,060	29,317	29,757	35,240
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 3,693
Number of reported claims per year | Claim		6,087
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 23,113		21,304	18,461	13,377	5,784
Accident Year 2016 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		80,788		79,015	77,362	68,974	61,638
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 2,420
Number of reported claims per year | Claim		3,751
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 74,324		70,324	52,764	30,377	6,843
Accident Year 2016 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		3,090		2,993	1,522	2,482	6,368
Total of incurred-but-not-reported liabilities plus expected development on reported claims		435
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		2,496		2,254	99	5	0
Accident Year 2016 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		4,894		5,965	5,847	6,312	6,729
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 112
Number of reported claims per year | Claim		704
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 4,785		4,807	4,818	4,388	$ 1,596
Accident Year 2017 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		34,930		36,211	37,731	42,387
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 5,921
Number of reported claims per year | Claim		16,469
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 23,910		20,863	15,811	6,150
Accident Year 2017 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		97,663		99,287	103,611	103,126
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 12,197
Number of reported claims per year | Claim		5,403
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 73,496		58,173	46,529	11,415
Accident Year 2017 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		0		0	0	0
Total of incurred-but-not-reported liabilities plus expected development on reported claims		0
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		0		0	0	0
Accident Year 2017 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		11,031		12,976	13,334	17,041
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 111
Number of reported claims per year | Claim		1,040
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 9,645		9,126	7,756	$ 3,229
Accident Year 2018 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		62,451		61,530	62,973
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 13,632
Number of reported claims per year | Claim		14,295
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 36,794		27,862	10,987
Accident Year 2018 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		186,521		177,262	179,589
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 29,518
Number of reported claims per year | Claim		8,197
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 101,803		66,575	18,689
Accident Year 2018 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		0		0	0
Total of incurred-but-not-reported liabilities plus expected development on reported claims		0
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		0		0	0
Accident Year 2018 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		12,147		17,053	16,365
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 412
Number of reported claims per year | Claim		892
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 10,642		9,807	5,324
Accident Year 2018 [Member] | Physical Damage [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	[1]	49,767		50,122	53,726
Total of incurred-but-not-reported liabilities plus expected development on reported claims	[1]	$ 22
Number of reported claims per year | Claim	[1]	11,151
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance	[1]	$ 49,638		49,685	41,631
Accident Year 2019 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		67,113		65,837
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 19,079
Number of reported claims per year | Claim		9,480
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 31,140		13,171
Accident Year 2019 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		195,273		198,022
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 53,842
Number of reported claims per year | Claim		8,313
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 64,294		19,311
Accident Year 2019 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		0		0
Total of incurred-but-not-reported liabilities plus expected development on reported claims		0
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		0		0
Accident Year 2019 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		11,134		10,498
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 1,469
Number of reported claims per year | Claim		882
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 7,782		4,007
Accident Year 2019 [Member] | Physical Damage [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	[1]	54,126		55,354	0
Total of incurred-but-not-reported liabilities plus expected development on reported claims	[1]	$ 141
Number of reported claims per year | Claim	[1]	10,472
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance	[1]	$ 53,647		44,197	$ 0
Accident Year 2020 [Member] | Workers' Compensation [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		60,204
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 34,084
Number of reported claims per year | Claim		7,550
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 10,508
Accident Year 2020 [Member] | Commercial Liability [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		173,878
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 109,654
Number of reported claims per year | Claim		4,410
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 13,185
Accident Year 2020 [Member] | Professional Liability Reinsurance Assumed [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		0
Total of incurred-but-not-reported liabilities plus expected development on reported claims		0
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		0
Accident Year 2020 [Member] | Occupational Accident [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance		12,869
Total of incurred-but-not-reported liabilities plus expected development on reported claims		$ 2,508
Number of reported claims per year | Claim		772
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance		$ 4,978
Accident Year 2020 [Member] | Physical Damage [Member]
Incurred Claims Development, Net of Reinsurance [Abstract]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	[1]	56,602		0
Total of incurred-but-not-reported liabilities plus expected development on reported claims	[1]	$ 3,233
Number of reported claims per year | Claim	[1]	9,130
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance	[1]	$ 42,726		$ 0

[1] The majority of physical damage claims settle within a two-year period. The triangles above have been abbreviated to reflect the short-tail nature of this business.