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Earnings per Common Share - Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Nelnet, Inc., basic $ 184,045 $ 89,826 $ 406,899
Net income attributable to Nelnet, Inc., diluted $ 184,045 $ 89,826 $ 406,899
Weighted-average common shares outstanding - basic (in shares) 36,642,533 37,416,621 37,603,033
Weighted-average common shares outstanding - diluted (in shares) 36,642,533 37,416,621 37,603,033
Earnings per share - basic (in dollars per share) $ 5.02 $ 2.40 $ 10.82
Earnings per share - diluted (in dollars per share) $ 5.02 $ 2.40 $ 10.82
Common shareholders      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Nelnet, Inc., basic $ 180,498 $ 87,936 $ 399,124
Net income attributable to Nelnet, Inc., diluted $ 180,498 $ 87,936 $ 399,124
Weighted-average common shares outstanding - basic (in shares) 35,936,337 36,629,437 36,884,548
Weighted-average common shares outstanding - diluted (in shares) 35,936,337 36,629,437 36,884,548
Earnings per share - basic (in dollars per share) $ 5.02 $ 2.40 $ 10.82
Earnings per share - diluted (in dollars per share) $ 5.02 $ 2.40  
Unvested restricted stock shareholders      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Nelnet, Inc., basic $ 3,547 $ 1,890 $ 7,775
Net income attributable to Nelnet, Inc., diluted $ 3,547 $ 1,890 $ 7,775
Weighted-average common shares outstanding - basic (in shares) 706,196 787,184 718,485
Weighted-average common shares outstanding - diluted (in shares) 706,196 787,184 718,485
Earnings per share - basic (in dollars per share) $ 5.02 $ 2.40 $ 10.82
Earnings per share - diluted (in dollars per share) $ 5.02 $ 2.40