Purchased Receivables - Allowance on Net Purchase Receivables (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Balance at beginning of period	$ 183,000	$ 169,000	$ 171,000	$ 181,000
Charge-offs	(207,000)	(135,000)	(486,000)	(869,000)
Balance at end of period	194,000	163,000	194,000	163,000
Purchased Receivable
Purchased Receivable Allowance for Loan Loss Reserve [Roll Forward]
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Charge-offs net of recoveries	0	0	0	0
Reserve for (recovery from) purchased receivables	$ 11,000	$ (6,000)	$ 23,000	$ (18,000)