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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 | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 31,966 | $ 48,637
% of Total Class of Financing Receivable | 0.13% | 0.22%
Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 1,003,089 | $ 331,889
% of Total Class of Financing Receivable | 4.20% | 1.48%
Private Education Loans | Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 31,966 | $ 48,637
% of Total Class of Financing Receivable | 0.13% | 0.22%
Private Education Loans | Interest Rate Reduction | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 3.79% | 4.00%
Private Education Loans | Interest Rate Reduction | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 13.22% | 13.37%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 1,003,089 | $ 331,889
% of Total Class of Financing Receivable | 4.20% | 1.48%
Weighted average life of loans | 9 years 2 months 23 days | 10 years 2 months 12 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 3.66% | 4.00%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 12.71% | 12.92%

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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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