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Loans and Accrued Interest Receivable and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period $ 104,643 $ 131,827 $ 127,113
Provision for loan losses 54,439 8,042 34,900
Charge-offs (48,698) (38,367) (32,096)
Recoveries 3,275 3,135 1,248
Initial allowance on loans purchased with credit deterioration 1,231 6 662
Loan sales 0 0 0
Balance at end of period 114,890 104,643 131,827
Provision (negative provision) for loan losses 54,439 8,042 34,900
Federally insured loans - Non-Nelnet Bank      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 68,453 83,593 103,381
Provision for loan losses (917) 4,303 3,731
Charge-offs (18,445) (19,593) (24,181)
Recoveries 0 0 0
Initial allowance on loans purchased with credit deterioration 0 6 662
Loan sales 0 144 0
Balance at end of period 49,091 68,453 83,593
Provision (negative provision) for loan losses (917) 4,303 3,731
Private education loans - Non-Nelnet Bank      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 15,750 15,411 16,143
Provision for loan losses (392) 2,865 2,487
Charge-offs (5,045) (3,306) (3,879)
Recoveries 817 780 656
Initial allowance on loans purchased with credit deterioration 0 0 0
Loan sales 0 0 4
Balance at end of period 11,130 15,750 15,411
Provision (negative provision) for loan losses (392) 2,865 2,487
Consumer loans and other loans - Non-Nelnet Bank      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 11,742 30,263 6,481
Provision for loan losses 29,000 (7,528) 26,915
Charge-offs (11,033) (12,467) (3,725)
Recoveries 1,349 1,474 592
Initial allowance on loans purchased with credit deterioration 0 0 0
Loan sales 7,410 0 0
Balance at end of period 38,468 11,742 30,263
Provision for current period 42,529 49,807 38,383
Loan sale reduction to provision (13,529) (57,335) (11,468)
Provision (negative provision) for loan losses 29,000 (7,528) 26,915
Federally insured loans - Nelnet Bank      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 0 170 268
Provision for loan losses   (14) (93)
Charge-offs   (12) (5)
Recoveries   0 0
Initial allowance on loans purchased with credit deterioration   0 0
Loan sales   (144) 0
Balance at end of period   0 170
Provision (negative provision) for loan losses   (14) (93)
Private education loans - Nelnet Bank      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 3,347 2,390 840
Provision for loan losses 7,830 2,171 1,860
Charge-offs (3,084) (1,214) (306)
Recoveries 762 0 0
Initial allowance on loans purchased with credit deterioration 1,231 0 0
Loan sales 0 0 (4)
Balance at end of period 10,086 3,347 2,390
Provision (negative provision) for loan losses 7,830 2,171 1,860
Consumer and other loans - Nelnet Bank      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 5,351 0  
Provision for loan losses 18,918 6,245  
Charge-offs (11,091) (1,775)  
Recoveries 347 881  
Initial allowance on loans purchased with credit deterioration 0 0  
Loan sales (7,410) 0  
Balance at end of period 6,115 5,351 $ 0
Provision (negative provision) for loan losses $ 18,918 $ 6,245