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Allowance for Credit Losses and Unfunded Loan Commitments - Accrued Interest Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Receivables [Abstract] |  |
Total Interest Receivable | $ 1,701,944 | $ 1,549,415
90 Days or Greater Past Due | 5,381 | 6,420
Allowance for Uncollectible Interest | 12,694 | 12,366
Accrued interest receivable not expected to be capitalized | 159,000 | 164,000
Accrued interest receivable expected to be capitalized reserved | $ 1,500,000 | $ 1,400,000

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- Definition Accrued Interest Receivable Expected To Be Capitalized Reserved Allowance For Credit Losses + References No definition available. + Details
Name: | slm_AccruedInterestReceivableExpectedToBeCapitalizedReservedAllowanceForCreditLosses
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued Interest Receivable Not Expected To Be Capitalized + References No definition available. + Details
Name: | slm_AccruedInterestReceivableNotExpectedToBeCapitalized
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accrued interest receivable on private education loans. + References No definition available. + Details
Name: | slm_AccruedInterestReceivableOnPrivateEducationLoans
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Allowance For Uncollectible Accrued Interest + References No definition available. + Details
Name: | slm_AllowanceForUncollectibleAccruedInterest
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Greater than ninety days past due accrued interest receivable. + References No definition available. + Details
Name: | slm_GreaterThanNinetyDaysPastDueAccruedInterestReceivable
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration