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Loans and Interest Receivable - Troubled Debt Restructurings ("TDRs") (Details)
3 Months Ended
Mar. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, modifications, payment default, threshold period past due 60 days
Minimum  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, modifications, term 1 year
Maximum  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, modifications, term 5 years 6 months