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Loans and Accrued Interest Receivable and Allowance for Loan Losses - Schedule of Nelnet Bank's Private Education Loans by FICO Score at Origination (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Private education loans - Nelnet Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 21,406 $ 66,515  
Fiscal year before current fiscal year 90,789 35,880  
Fiscal year two years before current fiscal year 33,232 38,633  
Fiscal year three years before current fiscal year 34,213 145,733  
Fiscal year four years before current fiscal year 135,219 82,537  
Fiscal year five years before current fiscal year 206,300 149,336  
Total loans $ 521,159 $ 518,634 $ 516,663
Percent of total 100.00% 100.00%  
Private education loans - Nelnet Bank | Less than 705      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 1,959 $ 5,540  
Fiscal year before current fiscal year 6,907 2,788  
Fiscal year two years before current fiscal year 2,641 2,909  
Fiscal year three years before current fiscal year 2,550 4,061  
Fiscal year four years before current fiscal year 3,621 3,519  
Fiscal year five years before current fiscal year 19,626 18,772  
Total loans $ 37,304 $ 37,589  
Percent of total 7.20% 7.20%  
Private education loans - Nelnet Bank | 705 - 734      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 2,379 $ 9,056  
Fiscal year before current fiscal year 12,104 4,795  
Fiscal year two years before current fiscal year 4,444 7,480  
Fiscal year three years before current fiscal year 6,651 17,048  
Fiscal year four years before current fiscal year 15,689 6,565  
Fiscal year five years before current fiscal year 19,047 14,410  
Total loans $ 60,314 $ 59,354  
Percent of total 11.60% 11.40%  
Private education loans - Nelnet Bank | 735 - 764      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 2,948 $ 12,256  
Fiscal year before current fiscal year 16,514 5,534  
Fiscal year two years before current fiscal year 5,118 7,073  
Fiscal year three years before current fiscal year 6,536 26,369  
Fiscal year four years before current fiscal year 24,589 11,066  
Fiscal year five years before current fiscal year 29,207 21,511  
Total loans $ 84,912 $ 83,809  
Percent of total 16.30% 16.20%  
Private education loans - Nelnet Bank | 765 - 794      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 4,502 $ 16,293  
Fiscal year before current fiscal year 22,812 6,471  
Fiscal year two years before current fiscal year 6,183 5,035  
Fiscal year three years before current fiscal year 4,600 40,851  
Fiscal year four years before current fiscal year 38,357 20,858  
Fiscal year five years before current fiscal year 41,690 26,025  
Total loans $ 118,144 $ 115,533  
Percent of total 22.70% 22.30%  
Private education loans - Nelnet Bank | Greater than 794      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 9,618 $ 23,370  
Fiscal year before current fiscal year 32,452 14,017  
Fiscal year two years before current fiscal year 12,988 11,819  
Fiscal year three years before current fiscal year 10,312 57,404  
Fiscal year four years before current fiscal year 52,963 40,529  
Fiscal year five years before current fiscal year 96,730 68,618  
Total loans $ 215,063 $ 215,757  
Percent of total 41.20% 41.60%  
Private education loans - Nelnet Bank | No FICO score available or required      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 0 $ 0  
Fiscal year before current fiscal year 0 2,275  
Fiscal year two years before current fiscal year 1,858 4,317  
Fiscal year three years before current fiscal year 3,564 0  
Fiscal year four years before current fiscal year 0 0  
Fiscal year five years before current fiscal year 0 0  
Total loans $ 5,422 $ 6,592  
Percent of total 1.00% 1.30%  
Consumer and other loans - Nelnet Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 13,905 $ 123,449  
Fiscal year before current fiscal year 117,896 109,603  
Fiscal year two years before current fiscal year 102,128 11,489  
Fiscal year three years before current fiscal year 10,884 364  
Fiscal year four years before current fiscal year 341 10,643  
Fiscal year five years before current fiscal year 19,443 11,060  
Total loans $ 264,597 $ 266,608 $ 204,423
Percent of total 100.00% 100.00%  
Consumer and other loans - Nelnet Bank | Less than 720      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 413 $ 13,054  
Fiscal year before current fiscal year 12,537 16,301  
Fiscal year two years before current fiscal year 15,245 1,618  
Fiscal year three years before current fiscal year 1,600 0  
Fiscal year four years before current fiscal year 0 275  
Fiscal year five years before current fiscal year 1,220 1,210  
Total loans $ 31,015 $ 32,458  
Percent of total 11.70% 12.20%  
Consumer and other loans - Nelnet Bank | 720 - 769      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 2,099 $ 24,995  
Fiscal year before current fiscal year 22,707 36,292  
Fiscal year two years before current fiscal year 32,934 3,621  
Fiscal year three years before current fiscal year 3,485 15  
Fiscal year four years before current fiscal year 13 5,231  
Fiscal year five years before current fiscal year 10,749 6,686  
Total loans $ 71,987 $ 76,840  
Percent of total 27.20% 28.80%  
Consumer and other loans - Nelnet Bank | Greater than 769      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 8,285 $ 54,681  
Fiscal year before current fiscal year 47,706 47,537  
Fiscal year two years before current fiscal year 43,070 5,819  
Fiscal year three years before current fiscal year 5,371 90  
Fiscal year four years before current fiscal year 56 5,084  
Fiscal year five years before current fiscal year 7,421 3,161  
Total loans $ 111,909 $ 116,372  
Percent of total 42.30% 43.60%  
Consumer and other loans - Nelnet Bank | No FICO score available or required      
Financing Receivable, Credit Quality Indicator [Line Items]      
Current fiscal year $ 3,108 $ 30,719  
Fiscal year before current fiscal year 34,946 9,473  
Fiscal year two years before current fiscal year 10,879 431  
Fiscal year three years before current fiscal year 428 259  
Fiscal year four years before current fiscal year 272 53  
Fiscal year five years before current fiscal year 53 3  
Total loans $ 49,686 $ 40,938  
Percent of total 18.80% 15.40%