Reserves for Losses and Loss Adjustment Expenses (Incurred and Paid Claims Development - Property) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) claim	Dec. 31, 2020 USD ($)	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 ($)	Dec. 31, 2012 USD ($)
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development	$ 6,040	$ 58,288
Incurred claims and claim adjustment expenses related to current year	269,204	326,919
Total incurred	275,244	406,907
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	177,571	185,407
Paid claims and allocated claim adjustment expenses related to current year	101,475	113,312
Total paid	279,046	320,419
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	428,766	432,568	$ 346,080
Loss Adjustment Expenses Recognized In 2012 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years										$ 1,181
Property [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total incurred	243,794
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	210,286
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	33,508
Property [Member] | Loss Adjustment Expenses Recognized In 2012 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		17,963	17,963	$ 17,974	$ 18,005	$ 17,768	$ 17,743	$ 18,119	$ 17,541	18,518
Incurred claims and claim adjustment expenses related to current year	$ 17,963
Cumulative number of reported claims | claim	1,629
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 17,963	17,963	17,963	17,974	17,978	17,693	17,666	17,743	17,679	$ 15,773
Property [Member] | Loss Adjustment Expenses Recognized In 2013 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		22,935	22,935	22,936	22,914	22,578	22,264	22,363	21,644
Incurred claims and claim adjustment expenses related to current year	$ 22,935
Cumulative number of reported claims | claim	1,893
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 22,933	22,935	22,935	22,936	22,826	22,197	21,864	21,452	$ 17,785
Property [Member] | Loss Adjustment Expenses Recognized In 2014 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		21,932	21,876	21,852	21,793	21,862	21,950	22,551
Incurred claims and claim adjustment expenses related to current year	$ 21,932
Cumulative number of reported claims | claim	2,037
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 22,000	22,013	21,955	21,911	21,849	21,778	21,749	$ 19,586
Property [Member] | Loss Adjustment Expenses Recognized in 2015 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		20,107	20,202	20,091	20,014	19,919	20,256
Incurred claims and claim adjustment expenses related to current year	$ 20,107
Cumulative number of reported claims | claim	1,993
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 19,960	19,965	19,953	20,134	19,928	19,500	$ 17,513
Property [Member] | Loss Adjustment Expenses Recognized in 2016 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		22,781	22,789	22,632	22,838	20,734
Incurred claims and claim adjustment expenses related to current year	$ 22,786
Cumulative number of reported claims | claim	2,031
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 22,786	22,781	22,789	22,613	22,500	$ 17,248
Property [Member] | Loss Adjustment Expenses Recognized in 2017 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		24,287	24,490	23,003	24,182
Incurred claims and claim adjustment expenses related to current year	$ 24,369
Cumulative number of reported claims | claim	2,009
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 24,187	24,179	23,821	22,059	$ 18,703
Property [Member] | Loss Adjustment Expenses Recognized In 2018 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		19,611	18,694	22,822
Incurred claims and claim adjustment expenses related to current year	19,680
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ (98)
Cumulative number of reported claims | claim	1,078
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 19,006	18,138	16,914	$ 10,923
Property [Member] | Loss Adjustment Expenses Recognized In 2019 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		20,984	20,214
Incurred claims and claim adjustment expenses related to current year	20,924
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ (23)
Cumulative number of reported claims | claim	1,239
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 19,658	18,895	$ 11,344
Property [Member] | Loss Adjustment Expenses Recognized In 2020 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		41,487
Incurred claims and claim adjustment expenses related to current year	38,472
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,359
Cumulative number of reported claims | claim	1,518
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 29,003	$ 18,215
Property [Member] | Loss Adjustment Expenses Recognized In 2021 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to current year	34,626
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 9,692
Cumulative number of reported claims | claim	1,265
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to current year	$ 12,790