Purchased Receivables - Summary of Allowance for Loan Losses Purchased Receivables (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 181,000	$ 289,000	$ 273,000
Charge-offs	(1,482,000)	(826,000)	(625,000)
Balance at end of year	171,000	181,000	289,000
Purchased Receivable
Allowance for Loan and Lease Losses [Roll Forward]
Charge-offs	0	0	(793,000)
Recoveries	0	30,000	105,000
Net recoveries (charge-offs)	0	30,000	(688,000)
Reserve for (recovery from) purchased receivables	$ (10,000)	$ (138,000)	$ 704,000