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Allowance for Credit Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
% of Balance          
Current period gross charge-offs, total $ (87,868) $ (105,137) $ (273,033) $ (315,353)  
Current period recoveries, total 11,149 9,693 33,840 33,385  
Current period net charge-offs, total (76,719) $ (95,444) (239,193) $ (281,968)  
Consumer Portfolio Segment | Student Loan          
% of Balance          
Current period gross charge-offs, Year 1     (672)   $ (1,812)
Current period gross charge-offs, Year 2     (16,359)   (31,032)
Current period gross charge-offs, Year 3     (48,389)   (70,331)
Current period gross charge-offs, Year 4     (38,496)   (49,624)
Current period gross charge-offs, Year 5     (27,088)   (50,585)
Current period gross charge-offs, After Year 5     (141,649)   (216,711)
Current period gross charge-offs, total     (272,653)   (420,095)
Current period recoveries, Year 1     37   172
Current period recoveries, Year 2     1,268   2,342
Current period recoveries, Year 3     4,876   6,496
Current period recoveries, Year 4     4,317   4,923
Current period recoveries, Year 5     2,886   5,260
Current period recoveries, After Year 5     20,456   27,175
Current period recoveries, total     33,840   46,368
Current period net charge-offs, Year 1     (635)   (1,640)
Current period net charge-offs, Year 2     (15,091)   (28,690)
Current period recoveries, Year 3     (43,513)   (63,835)
Current period recoveries, Year 4     (34,179)   (44,701)
Current period recoveries, Year 5     (24,202)   (45,325)
Current period recoveries, After Year 5     (121,193)   (189,536)
Current period net charge-offs, total     (238,813)   (373,727)
Total accrued interest by origination vintage, Year 1 104,376   104,376   177,959
Total accrued interest by origination vintage, Year 2 452,478   452,478   408,800
Total accrued interest by origination vintage, Year 3 350,208   350,208   269,978
Total accrued interest by origination vintage, Year 4 226,175   226,175   152,094
Total accrued interest by origination vintage, Year 5 126,965   126,965   116,618
Total accrued interest by origination vintage, After Year 5 269,612   269,612   229,116
Total accrued interest by origination vintage 1,529,814   1,529,814   1,354,565
Consumer Portfolio Segment | Student Loan | With and without cosigners          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 4,145,008   4,145,008   4,490,119
Year 2 5,363,248   5,363,248   5,088,739
Year 3 3,229,776   3,229,776   2,937,422
Year 4 2,113,786   2,113,786   1,819,089
Year 5 1,419,153   1,419,153   1,632,300
After Year 5 5,506,495   5,506,495   5,058,175
Loan type $ 21,777,466   $ 21,777,466   $ 21,025,844
% of Balance          
Total in percent 100.00%   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | With cosigner          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 3,734,881   $ 3,734,881   $ 3,903,676
Year 2 4,740,192   4,740,192   4,428,163
Year 3 2,775,372   2,775,372   2,516,380
Year 4 1,792,296   1,792,296   1,535,308
Year 5 1,185,946   1,185,946   1,378,699
After Year 5 4,854,732   4,854,732   4,529,768
Loan type $ 19,083,419   $ 19,083,419   $ 18,291,994
% of Balance          
Private education loans 88.00%   88.00%   87.00%
Consumer Portfolio Segment | Student Loan | Without cosigner          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 410,127   $ 410,127   $ 586,443
Year 2 623,056   623,056   660,576
Year 3 454,404   454,404   421,042
Year 4 321,490   321,490   283,781
Year 5 233,207   233,207   253,601
After Year 5 651,763   651,763   528,407
Loan type $ 2,694,047   $ 2,694,047   $ 2,733,850
% of Balance          
Private education loans 12.00%   12.00%   13.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 4,145,008   $ 4,145,008   $ 4,490,119
Year 2 5,363,248   5,363,248   5,088,739
Year 3 3,229,776   3,229,776   2,937,422
Year 4 2,113,786   2,113,786   1,819,089
Year 5 1,419,153   1,419,153   1,632,300
After Year 5 5,506,495   5,506,495   5,058,175
Loan type $ 21,777,466   $ 21,777,466   $ 21,025,844
% of Balance          
Total in percent 100.00%   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination | Less than 670          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 246,464   $ 246,464   $ 328,199
Year 2 394,068   394,068   395,526
Year 3 261,780   261,780   208,696
Year 4 156,049   156,049   118,935
Year 5 96,605   96,605   137,494
After Year 5 495,359   495,359   451,613
Loan type $ 1,650,325   $ 1,650,325   $ 1,640,463
% of Balance          
Private education loans at origination 8.00%   8.00%   8.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination | 670-699          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 509,488   $ 509,488   $ 635,642
Year 2 751,734   751,734   704,642
Year 3 450,549   450,549   400,744
Year 4 288,455   288,455   254,762
Year 5 201,741   201,741   257,840
After Year 5 937,664   937,664   868,777
Loan type $ 3,139,631   $ 3,139,631   $ 3,122,407
% of Balance          
Private education loans at origination 14.00%   14.00%   15.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination | 700-749          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 1,256,692   $ 1,256,692   $ 1,383,779
Year 2 1,649,606   1,649,606   1,586,783
Year 3 1,010,936   1,010,936   934,033
Year 4 673,104   673,104   590,401
Year 5 463,935   463,935   545,333
After Year 5 1,861,249   1,861,249   1,709,299
Loan type $ 6,915,522   $ 6,915,522   $ 6,749,628
% of Balance          
Private education loans at origination 32.00%   32.00%   32.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination | Greater than or equal to 750          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 2,132,364   $ 2,132,364   $ 2,142,499
Year 2 2,567,840   2,567,840   2,401,788
Year 3 1,506,511   1,506,511   1,393,949
Year 4 996,178   996,178   854,991
Year 5 656,872   656,872   691,633
After Year 5 2,212,223   2,212,223   2,028,486
Loan type $ 10,071,988   $ 10,071,988   $ 9,513,346
% of Balance          
Private education loans at origination 46.00%   46.00%   45.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 4,145,008   $ 4,145,008   $ 4,490,119
Year 2 5,363,248   5,363,248   5,088,739
Year 3 3,229,776   3,229,776   2,937,422
Year 4 2,113,786   2,113,786   1,819,089
Year 5 1,419,153   1,419,153   1,632,300
After Year 5 5,506,495   5,506,495   5,058,175
Loan type $ 21,777,466   $ 21,777,466   $ 21,025,844
% of Balance          
Total in percent 100.00%   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | Less than 670          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 350,534   $ 350,534   $ 495,451
Year 2 634,599   634,599   638,381
Year 3 460,995   460,995   379,738
Year 4 304,198   304,198   217,956
Year 5 195,926   195,926   214,665
After Year 5 866,117   866,117   791,875
Loan type $ 2,812,369   $ 2,812,369   $ 2,738,066
% of Balance          
Private education loans at origination 13.00%   13.00%   13.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | 670-699          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 530,612   $ 530,612   $ 616,684
Year 2 722,522   722,522   672,777
Year 3 411,258   411,258   365,674
Year 4 247,461   247,461   193,462
Year 5 142,707   142,707   176,963
After Year 5 599,235   599,235   564,245
Loan type $ 2,653,795   $ 2,653,795   $ 2,589,805
% of Balance          
Private education loans at origination 12.00%   12.00%   12.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | 700-749          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 1,240,651   $ 1,240,651   $ 1,347,094
Year 2 1,541,321   1,541,321   1,477,310
Year 3 904,821   904,821   836,747
Year 4 581,250   581,250   498,414
Year 5 371,047   371,047   445,244
After Year 5 1,464,960   1,464,960   1,361,073
Loan type $ 6,104,050   $ 6,104,050   $ 5,965,882
% of Balance          
Private education loans at origination 28.00%   28.00%   28.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | Greater than or equal to 750          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 2,023,211   $ 2,023,211   $ 2,030,890
Year 2 2,464,806   2,464,806   2,300,271
Year 3 1,452,702   1,452,702   1,355,263
Year 4 980,877   980,877   909,257
Year 5 709,473   709,473   795,428
After Year 5 2,576,183   2,576,183   2,340,982
Loan type $ 10,207,252   $ 10,207,252   $ 9,732,091
% of Balance          
Private education loans at origination 47.00%   47.00%   47.00%
Consumer Portfolio Segment | Student Loan | Seasoning          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 4,145,008   $ 4,145,008   $ 4,490,119
Year 2 5,363,248   5,363,248   5,088,739
Year 3 3,229,776   3,229,776   2,937,422
Year 4 2,113,786   2,113,786   1,819,089
Year 5 1,419,153   1,419,153   1,632,300
After Year 5 5,506,495   5,506,495   5,058,175
Loan type $ 21,777,466   $ 21,777,466   $ 21,025,844
% of Balance          
Total in percent 100.00%   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 1-12 payments          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 2,276,316   $ 2,276,316   $ 2,514,079
Year 2 2,140,723   2,140,723   740,450
Year 3 420,171   420,171   440,293
Year 4 247,167   247,167   245,631
Year 5 149,269   149,269   208,941
After Year 5 353,135   353,135   332,608
Loan type $ 5,586,781   $ 5,586,781   $ 4,482,002
% of Balance          
Seasoning based on monthly scheduled payments due from 1-12 payments 25.00%   25.00%   21.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 13-24 payments          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 0   $ 0   $ 0
Year 2 1,056,273   1,056,273   2,675,956
Year 3 1,277,280   1,277,280   303,045
Year 4 192,430   192,430   167,532
Year 5 127,669   127,669   165,577
After Year 5 374,514   374,514   384,760
Loan type $ 3,028,166   $ 3,028,166   $ 3,696,870
% of Balance          
Seasoning based on monthly scheduled payments due from 13 - 24 payments 14.00%   14.00%   18.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 25-36 payments          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 0   $ 0   $ 0
Year 2 0   0   0
Year 3 619,637   619,637   1,524,834
Year 4 855,419   855,419   195,091
Year 5 116,659   116,659   129,571
After Year 5 484,079   484,079   456,448
Loan type $ 2,075,794   $ 2,075,794   $ 2,305,944
% of Balance          
Seasoning based on monthly scheduled payments due from 25 - 36 payments 10.00%   10.00%   11.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 37-48 payments          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 0   $ 0   $ 0
Year 2 0   0   0
Year 3 0   0   0
Year 4 380,010   380,010   902,938
Year 5 524,320   524,320   208,521
After Year 5 453,928   453,928   446,350
Loan type $ 1,358,258   $ 1,358,258   $ 1,557,809
% of Balance          
Seasoning based on monthly scheduled payments due from 37 - 48 payments 6.00%   6.00%   7.00%
Consumer Portfolio Segment | Student Loan | Seasoning | More than 48 payments          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 0   $ 0   $ 0
Year 2 0   0   0
Year 3 0   0   0
Year 4 0   0   116
Year 5 276,001   276,001   706,097
After Year 5 3,336,669   3,336,669   2,985,015
Loan type $ 3,612,670   $ 3,612,670   $ 3,691,228
% of Balance          
Seasoning based on monthly scheduled payments due from more than 48 payments 17.00%   17.00%   18.00%
Consumer Portfolio Segment | Student Loan | Seasoning | Not yet in repayment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 $ 1,868,692   $ 1,868,692   $ 1,976,040
Year 2 2,166,252   2,166,252   1,672,333
Year 3 912,688   912,688   669,250
Year 4 438,760   438,760   307,781
Year 5 225,235   225,235   213,593
After Year 5 504,170   504,170   452,994
Loan type $ 6,115,797   $ 6,115,797   $ 5,291,991
% of Balance          
Seasoning based on monthly scheduled payments due from not yet in repayment 28.00%   28.00%   25.00%