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Deposits - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Banking and Thrift, Other Disclosure [Abstract]
Deposits	$ 20,012,108		$ 20,012,108		$ 21,068,568
Brokered deposits	7,700,000		7,700,000		9,500,000
Retail and other deposits	12,300,000		12,300,000		11,600,000
Stable interest-bearing deposits, total	7,200,000		7,200,000		7,000,000
Brokered deposit placement fee	2,000	$ 3,000	6,000	$ 8,000
Third party broker fees paid	4,000	$ 6,000	4,000	$ 6,000
Deposits exceeding FDIC insurance limits	590,000		590,000		567,000
Accrued interest on deposits	$ 53,000		$ 53,000		$ 92,000

X

- Definition

Brokered Deposit Placement Fee

+ References

No definition available.

+ Details

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Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Brokered Deposits

+ References

No definition available.

+ Details

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Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Retail And Other Deposits

+ References

No definition available.

+ Details

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Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Stable Interest-Bearing Deposits, Total

+ References

No definition available.

+ Details

Name:	slm_StableInterestBearingDepositsTotal
Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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X

- 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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