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Allowance for Credit Losses and Unfunded Loan Commitments - Amortized Cost Basis of Financing Receivables with Loan Modifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Interest Rate Reduction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 6,866 $ 21,159 $ 18,272 $ 28,633
% of Total Class of Financing Receivable 0.03% 0.09% 0.07% 0.12%
Combination - Interest Rate Reduction and Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 142,208 $ 449,484 $ 379,091 $ 937,723
% of Total Class of Financing Receivable 0.57% 1.92% 1.53% 4.01%
Private Education Loans | Interest Rate Reduction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 6,866 $ 21,159 $ 18,272 $ 28,633
% of Total Class of Financing Receivable 0.03% 0.09% 0.07% 0.12%
Private Education Loans | Interest Rate Reduction | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 12.44% 13.16% 12.77% 13.18%
Private Education Loans | Interest Rate Reduction | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 4.46% 3.59% 4.39% 3.59%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 142,208 $ 449,484 $ 379,091 $ 937,723
% of Total Class of Financing Receivable 0.57% 1.92% 1.53% 4.01%
Weighted average life of loans 9 years 3 months 29 days 9 years 5 months 1 day 9 years 4 months 20 days 9 years 2 months 15 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 12.41% 12.58% 12.32% 12.69%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 4.23% 3.51% 4.08% 3.60%