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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ (1,165,335) $ (1,361,723) $ (441,912) $ (341,121)
Loans held for investment, net 20,341,283 19,183,143    
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 20,716,863 19,729,337    
Deferred origination costs and unamortized premium/(discount) 67,488 63,475    
Allowance for credit losses (1,158,977) (1,355,844) (374,300)  
Loans held for investment, net 19,625,374 18,436,968    
Private Education Loans | Fixed-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 9,920,547 8,950,216    
Private Education Loans | Variable-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 10,796,316 10,779,121    
FFELP Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 695,216 737,593    
Deferred origination costs and unamortized premium/(discount) 1,815 1,993    
Allowance for credit losses (4,077) (4,378) (1,633)  
Loans held for investment, net 692,954 735,208    
Credit Cards        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 25,014 12,238    
Deferred origination costs and unamortized premium/(discount) 222 230    
Allowance for credit losses (2,281) (1,501) $ (102)  
Loans held for investment, net $ 22,955 $ 10,967