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Loans Receivable - Aging of the Loans Receivable Balance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Past due loans receivable (percentage) 11.40% 15.50%
Current loans receivable (percentage) 88.60% 84.50%
Balance of Loans Receivable on Nonaccrual Status $ 1,962 $ 2,284
30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable (percentage) 5.70% 6.90%
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable (percentage) 2.60% 3.60%
90 or more Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due loans receivable (percentage) 3.10% 5.00%
Balance of Loans Receivable Greater Than 90 Days Past Due and Still Accruing Interest and Fees $ 0 $ 0