v3.25.2
Bank Deposits - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Intercompany deposits $ 149,900 $ 68,500    
Restricted cash 317,958 $ 332,100 $ 538,446 $ 488,723
Deposits exceeding the FDIC insurance limits 44,300      
Nelnet Bank | Asset Pledged as Collateral        
Financial Instruments Owned and Pledged as Collateral [Line Items]        
Restricted cash $ 40,000