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Derivative Financial Instruments - Derivative Impact on Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlements, net	$ 6,134	$ 25,072	$ 32,943
Change in fair value	$ 10,124	(41,773)	231,691
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Derivative market value adjustments and derivative settlements, net
Derivative market value adjustments and derivative settlements, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlements, net	$ 6,134	25,072	32,943
Derivative market value adjustments and derivative settlements, net - income (expense)	16,258	(16,701)	264,634
1:3 basis swaps
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	(860)	(567)	2,262
1:3 basis swaps | Derivative market value adjustments and derivative settlements, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlements, net	929	1,544	(206)
Interest rate swaps - floor income hedges
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	6,282	(39,683)	229,429
Interest rate swaps - floor income hedges | Derivative market value adjustments and derivative settlements, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlements, net	4,288	23,044	33,149
Interest rate swaps - Nelnet Bank
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	4,702	(1,523)	0
Interest rate swaps - Nelnet Bank | Derivative market value adjustments and derivative settlements, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlements, net	$ 917	$ 484	$ 0

X

- Definition

derivative settlements

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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- Definition

Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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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/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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