XML 104 R80.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Allowance for Credit Losses - Accrued Interest Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Receivables [Abstract] |  |
Total Interest Receivable | $ 1,354,565 | $ 1,177,562
90 Days or Greater Past Due | 8,373 | 6,609
Allowance for uncollectible interest | 9,897 | 8,121
Accrued interest receivable not expected to be capitalized | 151,000 | 240,000
Accrued interest receivable expected to be capitalized reserved | $ 1,200,000 | $ 937,000

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

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