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Bank Deposits - Interest-Bearing Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deposit Liability [Line Items]
Intercompany deposits	$ 68,500	$ 104,000
Restricted cash	332,100	488,723	$ 945,159	$ 741,981
Retail and other savings	916,475	520,017
Brokered CDs, net of brokered deposit fees	247,872	203,522
Retail and other CDs, net of issuance fees	21,784	20,060
Total interest-bearing deposits	1,186,131	$ 743,599
Nelnet Bank | Asset Pledged as Collateral
Deposit Liability [Line Items]
Restricted cash	$ 40,000

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Intercompany Deposits

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- Definition

Interest-Bearing Domestic Deposit, Commercial

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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
-Name Regulation S-K (SK)
-Number 229
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- Definition

The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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-Topic 942
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-Name Accounting Standards Codification
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Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

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Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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