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Deposits -Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deposits [Abstract] |  |  |
Deposits | $ 21,653,188 | $ 21,448,071 |
Brokered deposits | 10,300,000 | 9,900,000 |
Retail and other deposits | 11,400,000 | 11,500,000 |
Stable interest-bearing deposits, total | 7,600,000 | 8,000,000 |
Brokered deposit placement fee | 12,000 | 13,000 | $ 16,000
Third party broker fees paid | 8,000 | 13,000 | $ 13,000
Deposits exceeding FDIC insurance limits | 478,000 | 615,000 |
Accrued interest on deposits | $ 91,000 | $ 59,000 |

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- Definition Brokered Deposit Placement Fee + References No definition available. + Details
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- Definition Brokered Deposits + References No definition available. + Details
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- Definition Retail and Other Deposits + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Stable Interest-bearing Deposits, Total + References No definition available. + Details
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- Definition Third Party Broker Fees Paid + References No definition available. + Details
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Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_Deposits
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- References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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