Reserve for Losses and Loss Adjustment Expenses (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
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
Less: Reinsurance recoverables	$ 0	$ 0	0	0	$ 0	$ 0
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			12,116	9,568
Prior years			(6,653)	(2,873)
Net incurred losses during the current period	1,770	2,964	5,463	6,695
Deduct payments for losses and LAE, net of reinsurance, occurring in:
Current period			97	112
Prior years			3,710	1,869
Net loss and LAE payments during the current period			3,807	1,981
Net reserve for losses and LAE at end of period	29,798	22,474	29,798	22,474
Plus: Reinsurance recoverables	0	0	0	0	$ 0	$ 0
Reserve for losses and LAE at end of period	$ 29,798	$ 22,474	$ 29,798	$ 22,474
Loans in default at end of period | loan	1,776	1,174	1,776	1,174
Reserve for losses and LAE, for prior years	$ 17,800	$ 13,000	$ 17,800	$ 13,000