Loans Receivable - Aging of the Loans Receivable Balance (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	[1]	14.10%	14.30%
Current loans receivable (percentage)	[1]	85.90%	85.70%
Balance of credit card loans on nonaccrual status	[1]	$ 1,598	$ 1,072
30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	[1]	6.30%	6.80%
60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	[1]	3.30%	3.20%
90 or more days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due loans receivable (percentage)	[1]	4.50%	4.30%
Balance of Loans Receivable 90 or More Days Past Due and Still Accruing Interest and Fees	[1]	$ 0	$ 0

[1] This aging is based on the contractual amounts outstanding for each loan as of period end, and does not reflect the fair value adjustments for the Acquired Loans.