Reserve for Losses and Loss Adjustment Expenses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($) loan
Reconciliation of the beginning and ending reserve balances for losses and loss adjustment expenses (LAE)
Reserve for losses and LAE at beginning of period	$ 28,142	$ 17,760
Net reserve for losses and LAE at beginning of period	28,142	17,760
Add provision for losses and LAE, net of reinsurance, occurring in:
Current period	7,090	5,080
Prior years	(3,397)	(1,349)
Net incurred losses during the current period	3,693	3,731
Deduct payments for losses and LAE, net of reinsurance, occurring in:
Current period	1	1
Prior years	2,366	1,020
Net loss and LAE payments during the current period	2,367	1,021
Net reserve for losses and LAE at end of period	29,468	20,470
Reserve for losses and LAE at end of period	$ 29,468	$ 20,470
Loans in default at end of period | loan	1,777	1,060
Reserve for losses and LAE, for prior years	$ 22,400	$ 15,400