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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
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Mar. 31, 2025 | Mar. 31, 2024
Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized Cost Basis | $ 6,768 | $ 4,991
% of Total Class of Financing Receivable | 0.03% | 0.02%
Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized Cost Basis | $ 138,507 | $ 252,761
% of Total Class of Financing Receivable | 0.57% | 1.13%
Private Education Loans | Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized Cost Basis | $ 6,768 | $ 4,991
% of Total Class of Financing Receivable | 0.03% | 0.02%
Private Education Loans | Interest Rate Reduction | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 13.11% | 13.15%
Private Education Loans | Interest Rate Reduction | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 4.36% | 3.94%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortized Cost Basis | $ 138,507 | $ 252,761
% of Total Class of Financing Receivable | 0.57% | 1.13%
Weighted average life of loans | 9 years 4 months 6 days | 8 years 7 months 2 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 12.10% | 12.57%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 4.01% | 3.71%

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- Definition Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Losses, Loan Modifications, Amortized Cost + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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