Loans Receivable - Aging of the Loans Receivable Balance (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	15.10%	15.30%
Current loans receivable (percentage)	84.90%	84.70%
30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	7.10%	7.90%
60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	3.40%	3.30%
90 or more days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	4.60%	4.10%
Balance of loans receivable 90 or more days past due and still accruing interest and fees	$ 0	$ 0