Fair Value Measurements, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Total realized/unrealized gains (losses) [Abstract]
State premium tax credit investments, average maturity			3 years
Annual average discount rate (in hundredths)					7.20%
Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,634	$ 2,231	$ 1,846	$ 2,423
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as losses incurred, net	0	0	0	0
Purchases	0	0	7	30
Sales	(247)	(237)	(466)	(459)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	1,634	2,231	1,846	2,423	$ 1,387	$ 1,994
Amount of total losses included in earnings attributable to the change in unrealized losses on assets still held	0	0	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	321	321	321	321
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as losses incurred, net	0	0	0	0
Purchases	2,535	0	2,535	0
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	321	321	321	321	2,856	321
Amount of total losses included in earnings attributable to the change in unrealized losses on assets still held	0	0	0	0
Total Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1,955	2,552	2,167	2,744
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as losses incurred, net	0	0	0	0
Purchases	2,535	0	2,542	30
Sales	(247)	(237)	(466)	(459)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	1,955	2,552	2,167	2,744	4,243	2,315
Amount of total losses included in earnings attributable to the change in unrealized losses on assets still held	0	0	0	0
Real Estate Acquired
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	7,995	10,804	12,658	13,280
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as losses incurred, net	(1,031)	(2,062)	(1,503)	(4,378)
Purchases	9,632	14,107	26,346	33,484
Sales	(6,512)	(6,284)	(27,417)	(25,821)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	7,995	10,804	12,658	13,280	$ 10,084	$ 16,565
Amount of total losses included in earnings attributable to the change in unrealized losses on assets still held	$ 0	$ 0	$ 0	$ 0