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Loans Receivable - Commercial Servicing Assets (Details)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset at Fair Value, Amount $ 583,000 $ 361,000 $ 0
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 10.0  
Minimum | Measurement Input, Prepayment Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input 0.125 11.5  
Maximum | Measurement Input, Discount Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input   12.8  
Maximum | Measurement Input, Prepayment Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing Asset, Measurement Input 0.186 19.7