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Allowance for Credit Losses and Unfunded Loan Commitments - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
% of Balance        
Current period gross charge-offs, total $ (91,168)   $ (185,165)  
Current period recoveries, total 11,377   22,691  
Current period net charge-offs, total $ (79,791)   $ (162,474)  
Consumer Portfolio Segment | Student Loan        
% of Balance        
Current period gross charge-offs, Year 1   $ (159)   $ (1,826)
Current period gross charge-offs, Year 2   (6,775)   (29,094)
Current period gross charge-offs, Year 3   (33,921)   (68,454)
Current period gross charge-offs, Year 4   (34,015)   (53,697)
Current period gross charge-offs, Year 5   (25,311)   (37,318)
Current period gross charge-offs, After Year 5   (93,588)   (186,451)
Current period gross charge-offs, total   (193,769)   (376,840)
Current period recoveries, Year 1   19   117
Current period recoveries, Year 2   452   2,191
Current period recoveries, Year 3   2,704   6,487
Current period recoveries, Year 4   3,330   5,771
Current period recoveries, Year 5   2,610   3,840
Current period recoveries, After Year 5   14,212   26,350
Current period recoveries, total   23,327   44,756
Current period net charge-offs, Year 1   (140)   (1,709)
Current period net charge-offs, Year 2   (6,323)   (26,903)
Current period recoveries, Year 3   (31,217)   (61,967)
Current period recoveries, Year 4   (30,685)   (47,926)
Current period recoveries, Year 5   (22,701)   (33,478)
Current period recoveries, After Year 5   (79,376)   (160,101)
Current period net charge-offs, total   (170,442)   (332,084)
Total accrued interest by origination vintage, Year 1   42,057   195,291
Total accrued interest by origination vintage, Year 2   424,303   484,531
Total accrued interest by origination vintage, Year 3   457,611   325,962
Total accrued interest by origination vintage, Year 4   302,033   197,504
Total accrued interest by origination vintage, Year 5   178,772   106,565
Total accrued interest by origination vintage, After Year 5   297,168   239,562
Total accrued interest by origination vintage   1,701,944   1,549,415
Consumer Portfolio Segment | Student Loan | With and without cosigners        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   1,475,825   5,024,592
Year 2   6,494,807   5,321,510
Year 3   4,066,289   3,185,247
Year 4   2,717,319   2,069,436
Year 5   1,832,671   1,373,996
After Year 5   5,938,906   5,260,227
Loan type   $ 22,525,817   $ 22,235,008
% of Balance        
Total in percent   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | With cosigner        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 1,313,131   $ 4,519,952
Year 2   5,916,194   4,707,685
Year 3   3,569,964   2,741,871
Year 4   2,331,492   1,759,261
Year 5   1,555,331   1,151,751
After Year 5   5,182,173   4,642,019
Loan type   $ 19,868,285   $ 19,522,539
% of Balance        
Private education loans   88.00%   88.00%
Consumer Portfolio Segment | Student Loan | Without cosigner        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 162,694   $ 504,640
Year 2   578,613   613,825
Year 3   496,325   443,376
Year 4   385,827   310,175
Year 5   277,340   222,245
After Year 5   756,733   618,208
Loan type   $ 2,657,532   $ 2,712,469
% of Balance        
Private education loans   12.00%   12.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 1,475,825   $ 5,024,592
Year 2   6,494,807   5,321,510
Year 3   4,066,289   3,185,247
Year 4   2,717,319   2,069,436
Year 5   1,832,671   1,373,996
After Year 5   5,938,906   5,260,227
Loan type   $ 22,525,817   $ 22,235,008
% of Balance        
Total in percent   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   $ 78,534   $ 293,025
Year 2   380,086   394,962
Year 3   308,242   261,589
Year 4   228,131   155,661
Year 5   141,381   94,355
After Year 5   516,846   475,186
Loan type   $ 1,653,220   $ 1,674,778
% of Balance        
Private education loans at origination   7.00%   8.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination | 670-699        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 191,662   $ 615,617
Year 2   787,362   753,548
Year 3   581,703   449,214
Year 4   387,166   285,181
Year 5   254,432   197,205
After Year 5   987,715   898,535
Loan type   $ 3,190,040   $ 3,199,300
% of Balance        
Private education loans at origination   14.00%   14.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination | 700-749        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 458,881   $ 1,525,547
Year 2   1,964,910   1,641,641
Year 3   1,257,401   998,834
Year 4   852,172   660,373
Year 5   585,375   451,695
After Year 5   2,002,102   1,782,121
Loan type   $ 7,120,841   $ 7,060,211
% of Balance        
Private education loans at origination   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   $ 746,748   $ 2,590,403
Year 2   3,362,449   2,531,359
Year 3   1,918,943   1,475,610
Year 4   1,249,850   968,221
Year 5   851,483   630,741
After Year 5   2,432,243   2,104,385
Loan type   $ 10,561,716   $ 10,300,719
% of Balance        
Private education loans at origination   47.00%   46.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 1,475,825   $ 5,024,592
Year 2   6,494,807   5,321,510
Year 3   4,066,289   3,185,247
Year 4   2,717,319   2,069,436
Year 5   1,832,671   1,373,996
After Year 5   5,938,906   5,260,227
Loan type   $ 22,525,817   $ 22,235,008
% of Balance        
Total in percent   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | Less than 670        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 127,524   $ 453,705
Year 2   649,610   666,049
Year 3   594,396   467,562
Year 4   454,577   301,367
Year 5   306,551   194,124
After Year 5   1,017,940   831,053
Loan type   $ 3,150,598   $ 2,913,860
% of Balance        
Private education loans at origination   14.00%   13.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | 670-699        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 194,160   $ 633,749
Year 2   804,699   710,546
Year 3   523,161   409,808
Year 4   336,709   248,325
Year 5   213,209   138,730
After Year 5   647,881   578,639
Loan type   $ 2,719,819   $ 2,719,797
% of Balance        
Private education loans at origination   12.00%   12.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed | 700-749        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 445,089   $ 1,485,771
Year 2   1,833,277   1,512,643
Year 3   1,103,764   879,450
Year 4   708,585   563,941
Year 5   473,632   362,715
After Year 5   1,506,496   1,398,737
Loan type   $ 6,070,843   $ 6,203,257
% of Balance        
Private education loans at origination   27.00%   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   $ 709,052   $ 2,451,367
Year 2   3,207,221   2,432,272
Year 3   1,844,968   1,428,427
Year 4   1,217,448   955,803
Year 5   839,279   678,427
After Year 5   2,766,589   2,451,798
Loan type   $ 10,584,557   $ 10,398,094
% of Balance        
Private education loans at origination   47.00%   47.00%
Consumer Portfolio Segment | Student Loan | Seasoning        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 1,475,825   $ 5,024,592
Year 2   6,494,807   5,321,510
Year 3   4,066,289   3,185,247
Year 4   2,717,319   2,069,436
Year 5   1,832,671   1,373,996
After Year 5   5,938,906   5,260,227
Loan type   $ 22,525,817   $ 22,235,008
% of Balance        
Total in percent   100.00%   100.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 1-12 payments        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 792,794   $ 2,860,113
Year 2   3,294,401   774,471
Year 3   567,092   499,812
Year 4   385,899   280,154
Year 5   221,822   159,762
After Year 5   375,717   324,506
Loan type   $ 5,637,725   $ 4,898,818
% of Balance        
Seasoning based on monthly scheduled payments due from 1-12 payments   25.00%   22.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 13-24 payments        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 0   $ 0
Year 2   556,519   2,729,334
Year 3   1,953,000   372,496
Year 4   238,352   191,989
Year 5   155,954   122,938
After Year 5   370,223   340,556
Loan type   $ 3,274,048   $ 3,757,313
% of Balance        
Seasoning based on monthly scheduled payments due from 13 - 24 payments   15.00%   17.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 25-36 payments        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 0   $ 0
Year 2   0   0
Year 3   299,832   1,564,157
Year 4   1,307,229   254,068
Year 5   152,753   110,952
After Year 5   450,441   429,127
Loan type   $ 2,210,255   $ 2,358,304
% of Balance        
Seasoning based on monthly scheduled payments due from 25 - 36 payments   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
Year 2   0   0
Year 3   0   0
Year 4   195,819   987,977
Year 5   895,007   170,051
After Year 5   517,518   451,494
Loan type   $ 1,608,344   $ 1,609,522
% of Balance        
Seasoning based on monthly scheduled payments due from 37 - 48 payments   7.00%   7.00%
Consumer Portfolio Segment | Student Loan | Seasoning | More than 48 payments        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 0   $ 0
Year 2   0   0
Year 3   0   0
Year 4   0   0
Year 5   114,387   625,916
After Year 5   3,690,139   3,262,308
Loan type   $ 3,804,526   $ 3,888,224
% of Balance        
Seasoning based on monthly scheduled payments due from more than 48 payments   17.00%   17.00%
Consumer Portfolio Segment | Student Loan | Seasoning | Not yet in repayment        
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
% of Balance        
Seasoning based on monthly scheduled payments due from not yet in repayment   26.00%   26.00%