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Allowance for Credit Losses - Accrued Interest Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Financing Receivable, Past Due [Line Items] |  |
Total Interest Receivable | $ 1,367,482 | $ 1,354,565
90 Days or Greater Past Due | 6,602 | 8,373
Allowance for Uncollectible Interest | 8,500 | 9,897
Accrued interest receivable not expected to be capitalized | 136,000 | 151,000
Accrued interest receivable expected to be capitalized reserved | 1,200,000 | 1,200,000
Loan delinquent 90 days or greater past due |  |
Financing Receivable, Past Due [Line Items] |  |
Accrued interest receivable not expected to be capitalized | 5,800 | 7,700
Accrued interest receivable expected to be capitalized reserved | $ 800 | $ 600

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- Definition Accrued Interest Receivable Expected To Be Capitalized Reserved Allowance For Credit Losses + References No definition available. + Details
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- Definition Accrued Interest Receivable Not Expected To Be Capitalized + References No definition available. + Details
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- Definition Accrued interest receivable on private education loans. + References No definition available. + Details
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Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Allowance For Uncollectible Accrued Interest + References No definition available. + Details
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Balance Type: | credit
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- Definition Greater than ninety days past due accrued interest receivable. + References No definition available. + Details
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Balance Type: | debit
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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 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
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- Details
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