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Loans Held for Investment - Narrative (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Jul. 01, 2006
Jun. 30, 2006
Sep. 30, 1993
Receivables [Abstract]          
Percent of private loans indexed to LIBOR 21.00% 23.00%      
Tier 1 of government guarantee (at least) 97.00%   97.00%    
Tier 2 of government guarantee       98.00%  
Tier 3 of government guarantee         100.00%
Estimated weighted average life of student loans 5 years 7 months 6 days 5 years 7 months 6 days