Reserves for Unpaid Losses and Loss Adjustment Expenses (Incurred and Paid Claims Development - Personal Segment) (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 ($)	Dec. 31, 2010 USD ($)
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
Personal Segment [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development	36	(1,511)
Total incurred	465,186
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	450,190
All outstanding liabilities before 2010, net of reinsurance	31	2,010	2,010	$ 2,010	$ 2,010	$ 2,010	$ 2,010
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	15,027
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2010 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		84,867	84,808	84,591	84,252	83,903	84,724	$ 80,765	$ 78,294	$ 63,862
Incurred claims and claim adjustment expenses related to current year	84,867
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 32
Cumulative number of reported claims	30,180
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		84,768	84,717	84,556	84,111	83,511	82,624	75,199	67,755	$ 38,643
Paid claims and allocated claim adjustment expenses related to current year	$ 84,782
Personal Segment [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		87,199	86,853	86,948	86,804	86,757	87,810	77,652	75,746
Incurred claims and claim adjustment expenses related to current year	$ 87,198
Cumulative number of reported claims | claim	31,615
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		86,989	86,660	86,593	86,217	85,533	83,497	67,939	$ 46,416
Paid claims and allocated claim adjustment expenses related to current year	$ 87,045
Personal Segment [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		72,076	72,037	72,042	71,513	70,552	73,795	58,604
Incurred claims and claim adjustment expenses related to current year	$ 72,100
Cumulative number of reported claims | claim	23,940
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		72,094	72,055	71,995	70,807	68,849	64,278	$ 37,860
Paid claims and allocated claim adjustment expenses related to current year	$ 72,124
Personal Segment [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		60,328	60,379	60,211	60,100	59,132	55,706
Incurred claims and claim adjustment expenses related to current year	$ 60,310
Cumulative number of reported claims | claim	23,472
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		60,297	60,277	59,775	58,047	54,514	$ 45,901
Paid claims and allocated claim adjustment expenses related to current year	$ 60,279
Personal Segment [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		6,504	6,699	6,243	5,340	5,452
Incurred claims and claim adjustment expenses related to current year	$ 6,518
Cumulative number of reported claims | claim	19,293
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		6,566	6,428	5,631	4,418	$ 2,515
Paid claims and allocated claim adjustment expenses related to current year	$ 6,580
Personal Segment [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		25,136	25,307	25,682	23,104
Incurred claims and claim adjustment expenses related to current year	$ 25,102
Cumulative number of reported claims | claim	23,376
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		25,243	24,262	22,281	$ 11,570
Paid claims and allocated claim adjustment expenses related to current year	$ 25,098
Personal Segment [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		32,728	32,893	32,260
Incurred claims and claim adjustment expenses related to current year	32,803
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 27
Cumulative number of reported claims | claim	23,752
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		32,260	30,646	$ 21,669
Paid claims and allocated claim adjustment expenses related to current year	$ 32,777
Personal Segment [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		21,968	23,342
Incurred claims and claim adjustment expenses related to current year	21,926
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 13
Cumulative number of reported claims | claim	16,796
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		21,061	$ 15,776
Paid claims and allocated claim adjustment expenses related to current year	$ 21,972
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2018 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		18,334
Incurred claims and claim adjustment expenses related to current year	18,353
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ (191)
Cumulative number of reported claims | claim	15,268
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years		$ 11,137
Paid claims and allocated claim adjustment expenses related to current year	$ 18,009
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2019 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to current year	56,009
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 619
Cumulative number of reported claims | claim	24,221
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to current year	$ 41,524