Reserves for Unpaid Losses and Loss Adjustment Expenses (Incurred and Paid Claims Development - Runoff) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($)	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 ($)
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development	$ 60,900	$ 5,953
Incurred claims and claim adjustment expenses related to current year	301,265	250,075
Total incurred	362,165	256,028
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	192,335	232,345
Paid claims and allocated claim adjustment expenses related to current year	127,610	90,640
Total paid	319,945	322,985
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	347,751	305,531	$ 372,488
Runoff [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total incurred	42,590
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	39,481
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	3,109
Runoff [Member] | Loss Adjustment Expenses Recognized In 2011 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		6,659	6,741	$ 6,678	$ 6,185	$ 7,547	$ 9,433	$ 9,949	$ 10,861
Incurred claims and claim adjustment expenses related to current year	6,637
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 287
Cumulative number of reported claims | claim	965
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 5,357	5,483	5,427	5,227	4,838	4,968	5,208	4,308	$ 2,897
Runoff [Member] | Loss Adjustment Expenses Recognized In 2012 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		2,752	2,636	2,821	3,358	3,597	4,469	4,804
Incurred claims and claim adjustment expenses related to current year	2,752
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 70
Cumulative number of reported claims | claim	661
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 2,675	2,602	2,600	2,583	2,594	2,411	2,107	$ 1,181
Runoff [Member] | Loss Adjustment Expenses Recognized In 2013 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		9,472	9,257	9,257	9,713	10,143	9,069
Incurred claims and claim adjustment expenses related to current year	9,486
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 165
Cumulative number of reported claims | claim	711
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 9,010	8,961	8,809	8,350	7,882	6,825	$ 3,737
Runoff [Member] | Loss Adjustment Expenses Recognized In 2014 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		10,452	10,076	9,762	9,338	9,208
Incurred claims and claim adjustment expenses related to current year	10,463
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 460
Cumulative number of reported claims | claim	1,130
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 9,323	9,210	9,004	7,970	5,972	$ 2,933
Runoff [Member] | Loss Adjustment Expenses Recognized in 2015 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		8,892	8,624	7,277	8,605
Incurred claims and claim adjustment expenses related to current year	8,420
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 182
Cumulative number of reported claims | claim	822
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 8,495	8,049	7,328	5,744	$ 2,528
Runoff [Member] | Loss Adjustment Expenses Recognized in 2016 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		4,365	4,733	3,553
Incurred claims and claim adjustment expenses related to current year	4,416
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 29
Cumulative number of reported claims | claim	599
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 4,418	3,743	2,550	$ 1,732
Runoff [Member] | Loss Adjustment Expenses Recognized in 2017 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		465	450
Incurred claims and claim adjustment expenses related to current year	415
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 72
Cumulative number of reported claims | claim	439
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 203	$ 171	$ 111
Runoff [Member] | Loss Adjustment Expenses Recognized In 2018 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Cumulative number of reported claims | claim	66