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Commitments and Contingencies (Details) - Loan Purchase Commitments
12 Months Ended
Dec. 31, 2020
USD ($)
Other Commitments [Line Items]  
Maximum funding percentage of each loan 30.00%
Participation amount in loan program $ 6,400,000
Loan program, guaranteed amount 1,500,000
Third-Party Bank  
Other Commitments [Line Items]  
Amount of loan participation program 14,900,000
Maximum | Third-Party Bank  
Other Commitments [Line Items]  
Amount of loan participation program $ 100,000,000