Purchased Receivables - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) segment purchased_receivable	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment purchased_receivable	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) purchased_receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of purchased receivables (less than)			1 year
Number of classes of purchased receivables | segment	1		1
Loans classified as troubled debt restructuring	$ 25,405,000		$ 25,405,000		$ 16,200,000
Charge-offs	$ 207,000	$ 135,000	$ 486,000	$ 869,000
Purchased Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of purchased receivables past due | purchased_receivable	0		0		0
Loans classified as troubled debt restructuring	$ 0		$ 0		$ 0
Charge-offs	$ 0	$ 0	$ 0	$ 0