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Loans Receivable - Commercial Servicing Assets (Details)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset at Fair Value, Amount $ 361,000    
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance $ 0 $ 0 $ 0
Minimum | Measurement Input, Discount Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input 0.100    
Minimum | Measurement Input, Prepayment Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input 0.115    
Maximum | Measurement Input, Discount Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input 0.128    
Maximum | Measurement Input, Prepayment Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input 0.197