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Loans Receivable - Troubled Debt Restructuring (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Financing Receivable, Modifications [Line Items]      
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings $ 0 $ 0  
Troubled Debt Restructurings      
Financing receivable modifications $ 0    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount     $ 0.0