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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses $ (1,364,716) $ (1,479,306) $ (1,357,075) $ (1,081,066) $ (1,227,362) $ (1,165,335)
Loans held for investment, net 19,219,518   19,626,868      
Private Education Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan type 19,938,363   20,303,688      
Deferred origination costs and unamortized premium/(discount) 70,835   69,656      
Allowance for credit losses (1,360,294)   (1,353,631)      
Loans held for investment, net 18,648,904   19,019,713      
Private Education Loans | Fixed-rate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan type 11,965,510   11,108,079      
Private Education Loans | Variable-rate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan type 7,972,853   9,195,609      
FFELP Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan type 573,597   609,050      
Deferred origination costs and unamortized premium/(discount) 1,439   1,549      
Allowance for credit losses (4,422)   (3,444)      
Loans held for investment, net $ 570,614   $ 607,155