Derivative Financial Instruments - Schedule of Fair Value of Asset and Liability Derivatives (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Fair value of asset derivatives	$ 2,776	$ 614
Fair value of liability derivatives	295	1,727
Nelnet Bank interest rate swaps - intercompany deposits
Derivative [Line Items]
Fair value of asset derivatives	2,379	614
Fair value of liability derivatives	295	1,243
Nelnet Bank interest rate swaps - third-party deposits (cash flow hedges)
Derivative [Line Items]
Fair value of asset derivatives	383	0
Fair value of liability derivatives	0	484
Other derivative instruments
Derivative [Line Items]
Fair value of asset derivatives	14	0
Fair value of liability derivatives	$ 0	$ 0

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

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