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Derivative Financial Instruments - Interest Rate Swaps, Floor Income Hedge (Details) - USD ($)
Mar. 15, 2023
Dec. 31, 2024
Interest Rate Swap , Non-Nelnet Bank    
Derivative [Line Items]    
Notional amount   $ 400,000,000
Weighted average fixed rate paid by the Company   3.71%
Cash received or receivable from derivative $ 183,200,000  
Proceeds for settlement of terminated derivatives 19,100,000  
Derivative, notional amount, terminated $ 2,800,000,000  
2026    
Derivative [Line Items]    
Notional amount   $ 200,000,000
Weighted average fixed rate paid by the Company   3.92%
2028    
Derivative [Line Items]    
Notional amount   $ 50,000,000
Weighted average fixed rate paid by the Company   3.56%
2029    
Derivative [Line Items]    
Notional amount   $ 50,000,000
Weighted average fixed rate paid by the Company   3.17%
2030    
Derivative [Line Items]    
Notional amount   $ 100,000,000
Weighted average fixed rate paid by the Company   3.63%
Interest Rate Swap, 2030 With November 2025 Effective Start Date    
Derivative [Line Items]    
Notional amount   $ 50,000,000