Purchased Receivables - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	$ 625,000	$ 1,196,000
Number Of Segments And Classes Of Purchased Receivables	1
Purchased Receivables Past Due	5,955,000	2,872,000
Total Modifications	7,688,000	7,900,000
Purchased Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs	793,000	150,000
Purchased Receivables Past Due	0	0
Total Modifications	$ 0	$ 0	$ 0