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Derivative Financial Instruments - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Interest Rate Swap, Nelnet Bank    
Derivative [Line Items]    
Notional amount $ 165,000 $ 140,000
Weighted average fixed rate paid by the Company 3.44% 3.46%
2028    
Derivative [Line Items]    
Notional amount $ 40,000 $ 40,000
Weighted average fixed rate paid by the Company 3.33% 3.33%
2029    
Derivative [Line Items]    
Notional amount $ 25,000 $ 0
Weighted average fixed rate paid by the Company 3.37% 0.00%
2030    
Derivative [Line Items]    
Notional amount $ 50,000 $ 50,000
Weighted average fixed rate paid by the Company 3.06% 3.06%
Interest Rate Swap, Nelnet Bank, 2030 With Forward Effective Date Of April 2026    
Derivative [Line Items]    
Notional amount $ 25,000  
Interest Rate Swap, Nelnet Bank, 2030 With Forward Effective Date Of May 2026    
Derivative [Line Items]    
Notional amount 25,000  
2032    
Derivative [Line Items]    
Notional amount $ 25,000 $ 25,000
Weighted average fixed rate paid by the Company 4.03% 4.03%
2033    
Derivative [Line Items]    
Notional amount $ 25,000 $ 25,000
Weighted average fixed rate paid by the Company 3.90% 3.90%