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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables with Loan Modifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Interest Rate Reduction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 5,571 $ 14,809 $ 9,005 $ 23,995
% of Total Class of Financing Receivable 0.03% 0.07% 0.04% 0.11%
Combination - Interest Rate Reduction and Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 272,125 $ 94,485 $ 504,366 $ 166,882
% of Total Class of Financing Receivable 1.29% 0.44% 2.39% 0.78%
Private Education Loans | Interest Rate Reduction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 5,571 $ 14,809 $ 9,005 $ 23,995
% of Total Class of Financing Receivable 0.03% 0.07% 0.04% 0.11%
Private Education Loans | Interest Rate Reduction | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 13.31% 13.30% 13.25% 13.06%
Private Education Loans | Interest Rate Reduction | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 3.46% 4.00% 3.62% 4.00%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 272,125 $ 94,485 $ 504,366 $ 166,882
% of Total Class of Financing Receivable 1.29% 0.44% 2.39% 0.78%
Weighted average life of loans 9 years 3 months 25 days 10 years 2 months 23 days 9 years 3 days 10 years 2 months 23 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 12.72% 12.84% 12.66% 12.69%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Average contractual rate 3.70% 4.00% 3.71% 4.00%