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Loans and Accrued Interest Receivable and Allowance for Loan Losses - Nelnet Bank's Private Education Loans by FICO Score at Origination (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Private education loans - Nelnet Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 27,747 $ 46,907  
Fiscal year before current fiscal year 48,159 190,466  
Fiscal year two years before current fiscal year 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
Private education loans - Nelnet Bank | Less than 705      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 2,566 3,840  
Fiscal year before current fiscal year 3,578 5,495  
Fiscal year two years before current fiscal year 4,759 4,647  
Fiscal year three years before current fiscal year 4,182 386  
Fiscal year four years before current fiscal year 331    
Prior years 15,485    
Total loans 30,901 14,368  
Private education loans - Nelnet Bank | 705 - 734      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 3,736 9,534  
Fiscal year before current fiscal year 8,874 21,961  
Fiscal year two years before current fiscal year 19,666 8,805  
Fiscal year three years before current fiscal year 7,531 525  
Fiscal year four years before current fiscal year 426    
Prior years 12,349    
Total loans 52,582 40,825  
Private education loans - Nelnet Bank | 735 - 764      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 4,398 8,648  
Fiscal year before current fiscal year 8,629 32,969  
Fiscal year two years before current fiscal year 29,918 14,910  
Fiscal year three years before current fiscal year 12,775 1,358  
Fiscal year four years before current fiscal year 1,286    
Prior years 17,920    
Total loans 74,926 57,885  
Private education loans - Nelnet Bank | 765 - 794      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 4,600 5,776  
Fiscal year before current fiscal year 6,115 52,045  
Fiscal year two years before current fiscal year 46,340 27,221  
Fiscal year three years before current fiscal year 24,073 1,374  
Fiscal year four years before current fiscal year 1,105    
Prior years 23,867    
Total loans 106,100 86,416  
Private education loans - Nelnet Bank | Greater than 794      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 9,971 15,057  
Fiscal year before current fiscal year 15,471 77,996  
Fiscal year two years before current fiscal year 67,454 58,695  
Fiscal year three years before current fiscal year 49,408 5,226  
Fiscal year four years before current fiscal year 4,406    
Prior years 63,258    
Total loans 209,968 156,974  
Private education loans - Nelnet Bank | No FICO score available or required      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 2,476 4,052  
Fiscal year before current fiscal year 5,492 0  
Fiscal year two years before current fiscal year 0 0  
Fiscal year three years before current fiscal year 0 0  
Fiscal year four years before current fiscal year 0    
Prior years 0    
Total loans 7,968 4,052  
Consumer and other loans - Nelnet Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 121,740 71,853  
Fiscal year before current fiscal year 13,278 444  
Fiscal year two years before current fiscal year 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  
Consumer and other loans - Nelnet Bank | Less than 720      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 19,264 21,412  
Fiscal year before current fiscal year 1,762 0  
Fiscal year two years before current fiscal year 0 0  
Fiscal year three years before current fiscal year 376    
Fiscal year four years before current fiscal year 675    
Prior years 1,170    
Total loans 23,247 21,412  
Consumer and other loans - Nelnet Bank | 720 - 769      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 41,217 33,571  
Fiscal year before current fiscal year 4,502 51  
Fiscal year two years before current fiscal year 19 0  
Fiscal year three years before current fiscal year 6,152    
Fiscal year four years before current fiscal year 5,448    
Prior years 3,105    
Total loans 60,443 33,622  
Consumer and other loans - Nelnet Bank | Greater than 769      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 57,323 16,484  
Fiscal year before current fiscal year 6,577 109  
Fiscal year two years before current fiscal year 103 0  
Fiscal year three years before current fiscal year 5,834    
Fiscal year four years before current fiscal year 2,755    
Prior years 1,165    
Total loans 73,757 16,593  
Consumer and other loans - Nelnet Bank | No FICO score available or required      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year 3,936 386  
Fiscal year before current fiscal year 437 284  
Fiscal year two years before current fiscal year 277 55  
Fiscal year three years before current fiscal year 55    
Fiscal year four years before current fiscal year 0    
Prior years 0    
Total loans $ 4,705 $ 725