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Loans and Accrued Interest Receivable and Allowance for Loan Losses - Loans Receivable and Accrued Interest Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accrued interest receivable $ 549,283 $ 764,385    
Loan discount, net of unamortized premiums and deferred origination costs (42,114) (33,872)    
Allowance for loan losses (114,890) (104,643) $ (131,827) $ (127,113)
Financing receivable, after allowance for credit loss 9,992,744 13,108,204    
Non-Nelnet Bank loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 8,955,868 12,049,462    
Allowance for loan losses (98,689) (95,945)    
Loan sold 65,100      
Federally insured loans - Non-Nelnet Bank        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 8,388,564 11,686,207 13,566,473  
Accrued interest receivable 540,272 757,713 808,150  
Loan discount, net of unamortized premiums and deferred origination costs (21,513) (28,963) (35,468)  
Allowance for loan losses (49,091) (68,453) (83,593) (103,381)
Financing receivable, after allowance for credit loss 8,858,232 12,346,504 14,255,562  
Federally insured loans - Non-Nelnet Bank | Stafford and other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 2,108,960 2,936,174    
Federally insured loans - Non-Nelnet Bank | Consolidation        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 6,279,604 8,750,033    
Private education loans - Non-Nelnet Bank        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 221,744 277,320 252,383  
Accrued interest receivable 2,019 2,653 2,146  
Loan discount, net of unamortized premiums and deferred origination costs (6,350) (8,037) (38)  
Allowance for loan losses (11,130) (15,750) (15,411) (16,143)
Financing receivable, after allowance for credit loss 206,283 256,186 239,080  
Consumer loans and other loans - Non-Nelnet Bank        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 345,560 85,935 350,915  
Accrued interest receivable 1,868 861 3,658  
Loan discount, net of unamortized premiums and deferred origination costs (10,713) (2,474) (588)  
Allowance for loan losses (38,468) (11,742) (30,263) (6,481)
Financing receivable, after allowance for credit loss 298,247 72,580 323,722  
Nelnet Bank loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 644,597 432,872    
Allowance for loan losses (16,201) (8,698)    
Private education loans - Nelnet Bank        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 482,445 360,520 353,882  
Accrued interest receivable 4,103 2,023 1,152  
Loan discount, net of unamortized premiums and deferred origination costs (4,581) 5,608 5,360  
Allowance for loan losses (10,086) (3,347) (2,390) $ (840)
Financing receivable, after allowance for credit loss 471,881 364,804 358,004  
Consumer and other loans - Nelnet Bank        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 162,152 72,352    
Accrued interest receivable 1,021 575    
Loan discount, net of unamortized premiums and deferred origination costs 1,043 (6)    
Allowance for loan losses (6,115) (5,351) $ 0  
Financing receivable, after allowance for credit loss $ 158,101 $ 67,570