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Condensed Parent Company Financial Statements - Condensed Parent Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Statement of Income Captions [Line Items]      
Net income $ 175,915 $ 49,330 $ 388,745
Net changes related to available-for-sale debt securities:      
Unrealized holding gains (losses) arising during period, net 33,479 18,379 (58,946)
Reclassification of (gains) losses recognized in net income, net (4,534) 3,504 (5,902)
Income tax effect (7,134) (5,301) 15,564
Unrealized gains (losses) during period after reclassifications and tax 22,590 16,784 (49,284)
Other comprehensive income (loss) 21,589 17,247 (46,670)
Comprehensive income 197,504 66,577 342,075
Comprehensive loss attributable to noncontrolling interests 8,130 40,496 18,154
Comprehensive income attributable to Nelnet, Inc. 205,634 107,073 360,229
Parent Company      
Condensed Statement of Income Captions [Line Items]      
Net income 183,331 89,616 406,861
Net changes related to equity in subsidiaries other comprehensive income (loss) 8,091 9,473 (11,188)
Net changes related to available-for-sale debt securities:      
Unrealized holding gains (losses) arising during period, net 19,242 6,412 (42,793)
Reclassification of (gains) losses recognized in net income, net (1,481) 3,818 (3,894)
Income tax effect (4,263) (2,456) 11,205
Unrealized gains (losses) during period after reclassifications and tax 13,498 7,774 (35,482)
Other comprehensive income (loss) 21,589 17,247 (46,670)
Comprehensive income 204,920 106,863 360,191
Comprehensive loss attributable to noncontrolling interests 714 210 38
Comprehensive income attributable to Nelnet, Inc. $ 205,634 $ 107,073 $ 360,229