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Subsequent Events - Narrative (Details) - Borrower
3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Subsequent Event [Line Items]    
Number of borrowers requesting forbearance plan   27,500
Subsequent Event    
Subsequent Event [Line Items]    
Number of borrowers requesting forbearance plan 114,600  
Forbearance Loans | Number Of Serviced Portfolio Loans    
Subsequent Event [Line Items]    
Concentration risk (percent)   2.00%
Forbearance Loans | Number Of Serviced Portfolio Loans | Subsequent Event    
Subsequent Event [Line Items]    
Concentration risk (percent) 8.50%