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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables that Subsequently Defaulted (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | $ 257,752 |  | $ 380,526
60 Days or Greater Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | 14,783 | $ 11,624 |
Payment Default | 14,496 | 11,404 |
Charge-Offs | 4,179 | 4,628 |
Combination - Interest Rate Reduction and Term Extension |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | 13,800 | 10,400 |
Interest Rate Reduction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | 1,000 | 1,200 |
Private Education Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | 257,752 |  | $ 380,526
Private Education Loans | 60 Days or Greater Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | 14,783 | 11,624 |
Payment Default | 14,496 | 11,404 |
Charge-Offs | $ 4,179 | $ 4,628 |

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- Definition Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
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