Portfolio Loans - Summary of Past Due and Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Total interest income that would have been recognized under original terms on impaired loans	$ 1,038	$ 1,013	$ 1,538
Total cash received and recognized as interest income on impaired loans	226	118	257
Total interest income recognized on impaired loans still accruing	$ 36	$ 39	$ 16