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Allowance for Credit Losses and Unfunded Loan Commitments - Financing Receivable, Modified, Subsequent Default (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, ,modified in period, amount $ 1,001,410 $ 373,683
Private Education Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, ,modified in period, amount 1,035,055 380,526
Private Education Loans | 60 Days or Greater Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, ,modified in period, amount 149,760 30,862
Period-end Amortized Cost Basis 118,928 28,972
Private Education Loans | Interest Rate Reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, ,modified in period, amount 6,460 4,521
Period-end Amortized Cost Basis 4,621 4,174
Private Education Loans | Combination - Interest Rate Reduction and Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, ,modified in period, amount 143,300 26,341
Period-end Amortized Cost Basis $ 114,307 $ 24,798