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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables that Subsequently Defaulted (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | $ 380,526 | $ 326,116
60 Days or Greater Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 28,972 | 22,925
Payment Default(3) | 30,862 | 22,621
Financing Receivable, Troubled Debt Restructuring, Write-Down | 8,070 | 6,331
Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 24,800 | 20,600
Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 4,200 | 2,300
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 380,526 | 326,116
Private Education Loans | 60 Days or Greater Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 28,972 | 22,925
Payment Default(3) | 30,862 | 22,621
Financing Receivable, Troubled Debt Restructuring, Write-Down | $ 8,070 | $ 6,331

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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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- Definition Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 44 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-44 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
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