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Loans and Accrued Interest Receivable and Allowance for Loan Losses - Loans by Year of Origination or Purchase (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]        
Accrued interest receivable $ 549,283 $ 764,385    
Loan premium (discount) (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    
Private education loans - Non-Nelnet Bank        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 198      
2022 4,739      
Fiscal year three years before current fiscal year 8,246      
Fiscal year four years before current fiscal year 40,969      
Prior years 167,592      
Total loans 221,744 277,320 252,383  
Accrued interest receivable 2,019 2,653 2,146  
Loan premium (discount) (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  
Current period gross charge-offs, current fiscal year 0      
Current period gross charge-offs, fiscal year before current fiscal year 0      
Current period gross charge-offs, two years before current fiscal year 0      
Current period gross charge-offs, three years before current fiscal year 90      
Current period gross charge-offs, more than five years before current fiscal year 271      
Current period gross charge-offs, total 4,684      
Current period gross charge-offs, total 5,045      
Private education loans - Non-Nelnet Bank | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 206,825 257,639 232,539  
Private education loans - Non-Nelnet Bank | Loans delinquent 31-60 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 3,424 3,395 2,410  
Private education loans - Non-Nelnet Bank | Loans delinquent 61-90 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 1,275 1,855 767  
Private education loans - Non-Nelnet Bank | Loans delinquent 91 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 2,134 2,427 1,894  
Private education loans - Non-Nelnet Bank | Loans in-school/grace/deferment        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 0      
2022 460      
Fiscal year three years before current fiscal year 2,401      
Fiscal year four years before current fiscal year 568      
Prior years 2,568      
Total loans 5,997      
Private education loans - Non-Nelnet Bank | Loans in forbearance        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 0      
2022 41      
Fiscal year three years before current fiscal year 203      
Fiscal year four years before current fiscal year 354      
Prior years 1,491      
Total loans 2,089      
Private education loans - Non-Nelnet Bank | Loans in repayment status:        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 198      
2022 4,238      
Fiscal year three years before current fiscal year 5,642      
Fiscal year four years before current fiscal year 40,047      
Prior years 163,533      
Total loans 213,658      
Private education loans - Non-Nelnet Bank | Loans in repayment status: | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 198      
2022 4,226      
Fiscal year three years before current fiscal year 5,567      
Fiscal year four years before current fiscal year 39,446      
Prior years 157,388      
Total loans 206,825      
Private education loans - Non-Nelnet Bank | Loans in repayment status: | Loans delinquent 31-60 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 0      
2022 0      
Fiscal year three years before current fiscal year 23      
Fiscal year four years before current fiscal year 446      
Prior years 2,955      
Total loans 3,424      
Private education loans - Non-Nelnet Bank | Loans in repayment status: | Loans delinquent 61-90 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 0      
2022 12      
Fiscal year three years before current fiscal year 36      
Fiscal year four years before current fiscal year 5      
Prior years 1,222      
Total loans 1,275      
Private education loans - Non-Nelnet Bank | Loans in repayment status: | Loans delinquent 91 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 0      
2022 0      
Fiscal year three years before current fiscal year 16      
Fiscal year four years before current fiscal year 150      
Prior years 1,968      
Total loans 2,134      
Consumer loans and other loans - Non-Nelnet Bank        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 289,297      
2023 52,290      
2022 3,224      
Fiscal year three years before current fiscal year 429      
Fiscal year four years before current fiscal year 249      
Prior years 71      
Total loans 345,560 85,935 350,915  
Accrued interest receivable 1,868 861 3,658  
Loan premium (discount) (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  
Current period gross charge-offs, current fiscal year 479      
Current period gross charge-offs, fiscal year before current fiscal year 8,197      
Current period gross charge-offs, two years before current fiscal year 1,961      
Current period gross charge-offs, three years before current fiscal year 236      
Current period gross charge-offs, more than five years before current fiscal year 40      
Current period gross charge-offs, total 120      
Current period gross charge-offs, total 11,033      
Consumer loans and other loans - Non-Nelnet Bank | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 335,355 81,195 346,812  
Consumer loans and other loans - Non-Nelnet Bank | Loans delinquent 31-60 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 3,667 2,035 1,906  
Consumer loans and other loans - Non-Nelnet Bank | Loans delinquent 61-90 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 2,143 1,189 764  
Consumer loans and other loans - Non-Nelnet Bank | Loans delinquent 91 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 4,245 1,370 1,324  
Consumer loans and other loans - Non-Nelnet Bank | Loans in-school/grace/deferment        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 51      
2023 99      
2022 0      
Fiscal year three years before current fiscal year 0      
Fiscal year four years before current fiscal year 0      
Prior years 0      
Total loans 150      
Consumer loans and other loans - Non-Nelnet Bank | Loans in repayment status:        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 289,246      
2023 52,191      
2022 3,224      
Fiscal year three years before current fiscal year 429      
Fiscal year four years before current fiscal year 249      
Prior years 71      
Total loans 345,410      
Consumer loans and other loans - Non-Nelnet Bank | Loans in repayment status: | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 284,333      
2023 47,626      
2022 2,746      
Fiscal year three years before current fiscal year 342      
Fiscal year four years before current fiscal year 243      
Prior years 65      
Total loans 335,355      
Consumer loans and other loans - Non-Nelnet Bank | Loans in repayment status: | Loans delinquent 31-60 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 1,969      
2023 1,611      
2022 60      
Fiscal year three years before current fiscal year 20      
Fiscal year four years before current fiscal year 6      
Prior years 1      
Total loans 3,667      
Consumer loans and other loans - Non-Nelnet Bank | Loans in repayment status: | Loans delinquent 61-90 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 886      
2023 1,164      
2022 83      
Fiscal year three years before current fiscal year 10      
Fiscal year four years before current fiscal year 0      
Prior years 0      
Total loans 2,143      
Consumer loans and other loans - Non-Nelnet Bank | Loans in repayment status: | Loans delinquent 91 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 2,058      
2023 1,790      
2022 335      
Fiscal year three years before current fiscal year 57      
Fiscal year four years before current fiscal year 0      
Prior years 5      
Total loans 4,245      
Private education loans - Nelnet Bank        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 27,747 46,907    
2023 48,159 190,466    
2022 168,137 114,278    
Fiscal year three years before current fiscal year 97,969 8,869    
Fiscal year four years before current fiscal year 7,554      
Prior years 132,879      
Total loans 482,445 360,520 353,882  
Accrued interest receivable 4,103 2,023 1,152  
Loan premium (discount) (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  
Current period gross charge-offs, current fiscal year 113      
Current period gross charge-offs, fiscal year before current fiscal year 1,010      
Current period gross charge-offs, two years before current fiscal year 986      
Current period gross charge-offs, three years before current fiscal year 342      
Current period gross charge-offs, more than five years before current fiscal year 47      
Current period gross charge-offs, total 586      
Current period gross charge-offs, total 3,084      
Private education loans - Nelnet Bank | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 439,569 338,448 340,830  
Private education loans - Nelnet Bank | Loans delinquent 30-59 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 4,327 839 167  
Private education loans - Nelnet Bank | Loans delinquent 60-89 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 1,497 253 32  
Private education loans - Nelnet Bank | Loans delinquent 90 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 2,317 606 409  
Private education loans - Nelnet Bank | Loans in-school/grace/deferment        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 14,402      
2023 9,733      
2022 5,942      
Fiscal year three years before current fiscal year 439      
Fiscal year four years before current fiscal year 219      
Prior years 939      
Total loans 31,674      
Private education loans - Nelnet Bank | Loans in forbearance        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 0      
2023 63      
2022 926      
Fiscal year three years before current fiscal year 743      
Fiscal year four years before current fiscal year 105      
Prior years 1,224      
Total loans 3,061      
Private education loans - Nelnet Bank | Loans in repayment status:        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 13,345      
2023 38,363      
2022 161,269      
Fiscal year three years before current fiscal year 96,787      
Fiscal year four years before current fiscal year 7,230      
Prior years 130,716      
Total loans 447,710      
Private education loans - Nelnet Bank | Loans in repayment status: | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 12,802      
2023 36,592      
2022 160,467      
Fiscal year three years before current fiscal year 95,821      
Fiscal year four years before current fiscal year 7,105      
Prior years 126,782      
Total loans 439,569      
Private education loans - Nelnet Bank | Loans in repayment status: | Loans delinquent 30-59 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 209      
2023 1,087      
2022 457      
Fiscal year three years before current fiscal year 715      
Fiscal year four years before current fiscal year 0      
Prior years 1,859      
Total loans 4,327      
Private education loans - Nelnet Bank | Loans in repayment status: | Loans delinquent 60-89 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 169      
2023 176      
2022 55      
Fiscal year three years before current fiscal year 42      
Fiscal year four years before current fiscal year 0      
Prior years 1,055      
Total loans 1,497      
Private education loans - Nelnet Bank | Loans in repayment status: | Loans delinquent 90 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 165      
2023 508      
2022 290      
Fiscal year three years before current fiscal year 209      
Fiscal year four years before current fiscal year 125      
Prior years 1,020      
Total loans 2,317      
Consumer and other loans - Nelnet Bank        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 121,740 71,853    
2023 13,278 444    
2022 399 55    
Fiscal year three years before current fiscal year 12,417      
Fiscal year four years before current fiscal year 8,878      
Prior years 5,440      
Total loans 162,152 72,352    
Accrued interest receivable 1,021 575    
Loan premium (discount) 1,043 (6)    
Allowance for loan losses (6,115) (5,351) $ 0  
Financing receivable, after allowance for credit loss 158,101 67,570    
Current period gross charge-offs, current fiscal year 958      
Current period gross charge-offs, fiscal year before current fiscal year 9,776      
Current period gross charge-offs, two years before current fiscal year 0      
Current period gross charge-offs, three years before current fiscal year 221      
Current period gross charge-offs, more than five years before current fiscal year 45      
Current period gross charge-offs, total 91      
Current period gross charge-offs, total 11,091      
Consumer and other loans - Nelnet Bank | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 155,772 69,584    
Consumer and other loans - Nelnet Bank | Loans delinquent 30-59 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 803 1,075    
Consumer and other loans - Nelnet Bank | Loans delinquent 60-89 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 243 941    
Consumer and other loans - Nelnet Bank | Loans delinquent 90 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total loans 148 $ 649    
Consumer and other loans - Nelnet Bank | Consumer And Other Loans In Deferment        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 5,186      
2023 0      
2022 0      
Fiscal year three years before current fiscal year 0      
Fiscal year four years before current fiscal year 0      
Prior years 0      
Total loans 5,186      
Consumer and other loans - Nelnet Bank | Consumer And Other Loans In Repayment        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 116,554      
2023 13,278      
2022 399      
Fiscal year three years before current fiscal year 12,417      
Fiscal year four years before current fiscal year 8,878      
Prior years 5,440      
Total loans 156,966      
Consumer and other loans - Nelnet Bank | Consumer And Other Loans In Repayment | Loans current        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 116,055      
2023 12,944      
2022 399      
Fiscal year three years before current fiscal year 12,211      
Fiscal year four years before current fiscal year 8,782      
Prior years 5,381      
Total loans 155,772      
Consumer and other loans - Nelnet Bank | Consumer And Other Loans In Repayment | Loans delinquent 30-59 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 333      
2023 199      
2022 0      
Fiscal year three years before current fiscal year 158      
Fiscal year four years before current fiscal year 94      
Prior years 19      
Total loans 803      
Consumer and other loans - Nelnet Bank | Consumer And Other Loans In Repayment | Loans delinquent 60-89 days        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 115      
2023 51      
2022 0      
Fiscal year three years before current fiscal year 48      
Fiscal year four years before current fiscal year 2      
Prior years 27      
Total loans 243      
Consumer and other loans - Nelnet Bank | Consumer And Other Loans In Repayment | Loans delinquent 90 days or greater        
Financing Receivable, Credit Quality Indicator [Line Items]        
2024 51      
2023 84      
2022 0      
Fiscal year three years before current fiscal year 0      
Fiscal year four years before current fiscal year 0      
Prior years 13      
Total loans $ 148