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Allowance for Credit Losses and Unfunded Loan Commitments - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private Education Loans allowance for losses $ (1,469,509) $ (1,435,920) $ (1,269,652) $ (1,350,058) $ (1,339,772)
Private Education Loans, net $ 21,160,332 $ 20,902,158      
Percentage of Private Education Loans in repayment, Year 1 53.60% 56.50%      
Percentage of Private Education Loans in repayment, Year 2 58.70% 63.50%      
Percentage of Private Education Loans in repayment, Year 3 67.40% 73.70%      
Percentage of Private Education Loans in repayment, Year 4 76.50% 80.30%      
Percentage of Private Education Loans in repayment, Year 5 82.10% 84.30%      
Percentage of Private Education Loans in repayment, After Year 5 89.30% 89.70%      
Percentage of Private Education Loans in repayment 72.10% 72.40%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 1 0.50% 0.70%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 2 0.90% 2.00%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 3 2.90% 3.80%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 4 3.90% 4.30%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 5 4.20% 4.40%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, After Year 5 5.80% 6.30%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment 3.50% 3.70%      
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 1 0.20% 0.70%      
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 2 1.10% 3.60%      
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 3 2.80% 3.60%      
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 4 2.30% 3.10%      
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 5 2.20% 2.70%      
Loans in forbearance as a percentage of loans in repayment and forbearance, After Year 5 1.80% 1.80%      
Loans in forbearance as a percentage of loans in repayment and forbearance 1.80% 2.50%      
Consumer Portfolio Segment | Student Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total Private Education Loans in Repayment, Year 1 $ 791,251 $ 2,840,129      
Total Private Education Loans in Repayment, Year 2 3,809,513 3,379,077      
Total Private Education Loans in Repayment, Year 3 2,741,144 2,348,504      
Total Private Education Loans in Repayment, Year 4 2,077,746 1,661,502      
Total Private Education Loans in Repayment, Year 5 1,505,378 1,158,044      
Total Private Education Loans in Repayment, After Year 5 5,306,162 4,719,495      
Total Private Education Loans in repayment 16,231,194 16,106,751      
Total Private Education Loans, gross, Year 1 1,475,825 5,024,592      
Total Private Education Loans, gross, Year 2 6,494,807 5,321,510      
Total Private Education Loans, gross, Year 3 4,066,289 3,185,247      
Total Private Education Loans, gross, Year 4 2,717,319 2,069,436      
Total Private Education Loans, gross, Year 5 1,832,671 1,373,996      
Total Private Education Loans, gross, After Year 5 5,938,906 5,260,227      
Total Private Education Loans, gross 22,525,817 22,235,008      
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 1 17,998 47,659      
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 2 41,612 25,599      
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 3 19,248 10,788      
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 4 8,863 6,142      
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 5 5,210 4,057      
Private Education Loans deferred origination costs and unamortized premium/(discount), After Year 5 11,093 8,825      
Private Education Loans deferred origination costs and unamortized premium/(discount) 104,024 103,070      
Total Private Education Loans, Year 1 1,493,823 5,072,251      
Total Private Education Loans, Year 2 6,536,419 5,347,109      
Total Private Education Loans, Year 3 4,085,537 3,196,035      
Total Private Education Loans, Year 4 2,726,182 2,075,578      
Total Private Education Loans, Year 5 1,837,881 1,378,053      
Total Private Education Loans, After Year 5 5,949,999 5,269,052      
Total Private Education Loans 22,629,841 22,338,078      
Private Education Loans allowance for losses, Year 1 (74,440) (258,235)      
Private Education Loans allowance for losses, Year 2 (345,981) (326,207)      
Private Education Loans allowance for losses, Year 3 (285,183) (234,532)      
Private Education Loans allowance for losses, Year 4 (212,178) (150,324)      
Private Education Loans allowance for losses, Year 5 (136,200) (90,600)      
Private Education Loans allowance for losses, After Year 5 (415,527) (376,022)      
Private Education Loans allowance for losses (1,469,509) (1,435,920)      
Private Education Loans, net, Year 1 1,419,383 4,814,016      
Private Education Loans, net, Year 2 6,190,438 5,020,902      
Private Education Loans, net, Year 3 3,800,354 2,961,503      
Private Education Loans, net, Year 4 2,514,004 1,925,254      
Private Education Loans, net, Year 5 1,701,681 1,287,453      
Private Education Loans, net, After Year 5 5,534,472 4,893,030      
Private Education Loans, net 21,160,332 20,902,158      
Consumer Portfolio Segment | Student Loan | Loan delinquent, current          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 786,912 2,820,940      
Year 2 3,775,987 3,312,916      
Year 3 2,662,224 2,259,455      
Year 4 1,996,177 1,590,812      
Year 5 1,442,298 1,107,189      
After Year 5 4,998,398 4,422,021      
Loan type 15,661,996 15,513,333      
Consumer Portfolio Segment | Student Loan | Loan delinquent 30-59 days          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 3,191 13,533      
Year 2 22,276 36,441      
Year 3 41,083 45,543      
Year 4 41,173 35,245      
Year 5 31,247 27,302      
After Year 5 161,146 152,684      
Loan type 300,116 310,748      
Consumer Portfolio Segment | Student Loan | Loan delinquent 60-89 days          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 678 3,973      
Year 2 7,027 15,239      
Year 3 20,917 23,359      
Year 4 21,730 18,365      
Year 5 18,138 10,921      
After Year 5 75,143 68,878      
Loan type 143,633 140,735      
Consumer Portfolio Segment | Student Loan | Loan delinquent 90 days or greater past due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 470 1,683      
Year 2 4,223 14,481      
Year 3 16,920 20,147      
Year 4 18,666 17,080      
Year 5 13,695 12,632      
After Year 5 71,475 75,912      
Loan type 125,449 141,935      
Loans In-school/grace/deferment | Consumer Portfolio Segment | Student Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 683,031 2,164,479      
Year 2 2,643,887 1,817,705      
Year 3 1,246,365 748,782      
Year 4 590,020 355,248      
Year 5 292,748 184,377      
After Year 5 534,868 452,236      
Loan type 5,990,919 5,722,827      
Loans In forbearance | Consumer Portfolio Segment | Student Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total Private Education Loans in forbearance, Year 1 1,543 19,984      
Total Private Education Loans in forbearance, Year 2 41,407 124,728      
Total Private Education Loans in forbearance, Year 3 78,780 87,961      
Total Private Education Loans in forbearance, Year 4 49,553 52,686      
Total Private Education Loans in forbearance, Year 5 34,545 31,575      
Total Private Education Loans in forbearance, After Year 5 97,876 88,496      
Total Private Education Loans in forbearance $ 303,704 $ 405,430