Loans Receivable - Aging of the Loans Receivable Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Past due loans receivable (percentage)	15.50%	14.60%
Current loans receivable (percentage)	84.50%	85.40%
Balance of Loans Receivable on Nonaccrual Status	$ 2,284	$ 2,110
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due loans receivable (percentage)	6.90%	6.90%
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due loans receivable (percentage)	3.60%	3.40%
90 or more Days Past Due
Financing Receivable, Past Due [Line Items]
Past due loans receivable (percentage)	5.00%	4.30%
Balance of Loans Receivable Greater Than 90 Days Past Due and Still Accruing Interest and Fees	$ 0	$ 0