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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Interest Rate Reduction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 7,093 $ 5,571 $ 13,195 $ 9,005
% of Total Class of Financing Receivable 0.03% 0.03% 0.05% 0.04%
Combination - Interest Rate Reduction and Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 134,398 $ 272,125 $ 265,624 $ 504,366
% of Total Class of Financing Receivable 0.55% 1.29% 1.09% 2.39%
Private Education Loans | Interest Rate Reduction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 7,093 $ 5,571 $ 13,195 $ 9,005
% of Total Class of Financing Receivable 0.03% 0.03% 0.05% 0.04%
Private Education Loans | Interest Rate Reduction | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 12.87% 13.31% 12.98% 13.25%
Private Education Loans | Interest Rate Reduction | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 4.32% 3.46% 4.35% 3.62%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amortized Cost Basis $ 134,398 $ 272,125 $ 265,624 $ 504,366
% of Total Class of Financing Receivable 0.55% 1.29% 1.09% 2.39%
Weighted average life of loans 9 years 3 months 25 days 9 years 3 months 25 days 9 years 4 months 6 days 9 years 3 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 12.29% 12.72% 12.23% 12.66%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 3.98% 3.70% 3.99% 3.71%