XML 49 R32.htm IDEA: XBRL DOCUMENT v3.19.1
Loans Held for Investment - Student Loan Portfolio by Program (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ (358,325) $ (341,121) $ (272,123) $ (251,475)
Loans held for investment, net 23,498,386 22,270,919    
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross amount of loans 21,791,622 20,504,465    
Deferred origination costs and unamortized premium/(discount) 70,858 68,321    
Allowance for loan losses (285,946) (277,943)    
Loans held for investment, net 21,576,534 20,294,843    
Private Education Loans | Fixed-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross amount of loans 8,025,846 6,759,019    
Private Education Loans | Variable-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross amount of loans 13,765,776 13,745,446    
FFELP Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross amount of loans 828,640 846,487    
Deferred origination costs and unamortized premium/(discount) 2,323 2,379    
Allowance for loan losses (1,760) (977)    
Loans held for investment, net 829,203 847,889    
Personal Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross amount of loans 1,162,874 1,190,091    
Deferred origination costs and unamortized premium/(discount) 394 297    
Allowance for loan losses (70,619) (62,201)    
Loans held for investment, net $ 1,092,649 $ 1,128,187