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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
% of Balance        
Current period gross charge-offs, total $ (87,868)   $ (273,033)  
Current period recoveries, total 11,149   33,840  
Current period net charge-offs, total $ (76,719)   $ (239,193)  
Consumer Portfolio Segment | Student Loan        
% of Balance        
Current period gross charge-offs, Year 1   $ (658)   $ (1,826)
Current period gross charge-offs, Year 2   (12,418)   (29,094)
Current period gross charge-offs, Year 3   (50,812)   (68,454)
Current period gross charge-offs, Year 4   (49,340)   (53,697)
Current period gross charge-offs, Year 5   (36,173)   (37,318)
Current period gross charge-offs, After Year 5   (135,440)   (186,451)
Current period gross charge-offs, total   (284,841)   (376,840)
Current period recoveries, Year 1   56   117
Current period recoveries, Year 2   891   2,191
Current period recoveries, Year 3   4,594   6,487
Current period recoveries, Year 4   5,289   5,771
Current period recoveries, Year 5   4,312   3,840
Current period recoveries, After Year 5   21,726   26,350
Current period recoveries, total   36,868   44,756
Current period net charge-offs, Year 1   (602)   (1,709)
Current period net charge-offs, Year 2   (11,527)   (26,903)
Current period recoveries, Year 3   (46,218)   (61,967)
Current period recoveries, Year 4   (44,051)   (47,926)
Current period recoveries, Year 5   (31,861)   (33,478)
Current period recoveries, After Year 5   (113,714)   (160,101)
Current period net charge-offs, total   (247,973)   (332,084)
Total accrued interest by origination vintage, Year 1   101,589   195,291
Total accrued interest by origination vintage, Year 2   485,987   484,531
Total accrued interest by origination vintage, Year 3   379,773   325,962
Total accrued interest by origination vintage, Year 4   280,428   197,504
Total accrued interest by origination vintage, Year 5   168,882   106,565
Total accrued interest by origination vintage, After Year 5   276,609   239,562
Total accrued interest by origination vintage   1,693,268   1,549,415
Consumer Portfolio Segment | Student Loan | With and without cosigners        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   4,309,428   5,024,592
Year 2   5,901,069   5,321,510
Year 3   3,120,076   3,185,247
Year 4   2,419,425   2,069,436
Year 5   1,693,855   1,373,996
After Year 5   5,586,146   5,260,227
Loan type   $ 23,029,999   $ 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   $ 4,001,023   $ 4,519,952
Year 2   5,382,558   4,707,685
Year 3   2,711,357   2,741,871
Year 4   2,069,418   1,759,261
Year 5   1,433,282   1,151,751
After Year 5   4,870,814   4,642,019
Loan type   $ 20,468,452   $ 19,522,539
% of Balance        
Private education loans   89.00%   88.00%
Consumer Portfolio Segment | Student Loan | Without cosigner        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 308,405   $ 504,640
Year 2   518,511   613,825
Year 3   408,719   443,376
Year 4   350,007   310,175
Year 5   260,573   222,245
After Year 5   715,332   618,208
Loan type   $ 2,561,547   $ 2,712,469
% of Balance        
Private education loans   11.00%   12.00%
Consumer Portfolio Segment | Student Loan | FICO at Origination        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 4,309,428   $ 5,024,592
Year 2   5,901,069   5,321,510
Year 3   3,120,076   3,185,247
Year 4   2,419,425   2,069,436
Year 5   1,693,855   1,373,996
After Year 5   5,586,146   5,260,227
Loan type   $ 23,029,999   $ 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   $ 264,423   $ 293,025
Year 2   344,011   394,962
Year 3   242,250   261,589
Year 4   205,864   155,661
Year 5   132,056   94,355
After Year 5   488,605   475,186
Loan type   $ 1,677,209   $ 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   $ 526,201   $ 615,617
Year 2   708,826   753,548
Year 3   447,327   449,214
Year 4   345,558   285,181
Year 5   236,629   197,205
After Year 5   931,168   898,535
Loan type   $ 3,195,709   $ 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   $ 1,249,988   $ 1,525,547
Year 2   1,784,529   1,641,641
Year 3   966,814   998,834
Year 4   759,111   660,373
Year 5   542,008   451,695
After Year 5   1,888,189   1,782,121
Loan type   $ 7,190,639   $ 7,060,211
% of Balance        
Private education loans at origination   31.00%   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   $ 2,268,816   $ 2,590,403
Year 2   3,063,703   2,531,359
Year 3   1,463,685   1,475,610
Year 4   1,108,892   968,221
Year 5   783,162   630,741
After Year 5   2,278,184   2,104,385
Loan type   $ 10,966,442   $ 10,300,719
% of Balance        
Private education loans at origination   48.00%   46.00%
Consumer Portfolio Segment | Student Loan | FICO Refreshed        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Year 1   $ 4,309,428   $ 5,024,592
Year 2   5,901,069   5,321,510
Year 3   3,120,076   3,185,247
Year 4   2,419,425   2,069,436
Year 5   1,693,855   1,373,996
After Year 5   5,586,146   5,260,227
Loan type   $ 23,029,999   $ 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   $ 379,852   $ 453,705
Year 2   586,745   666,049
Year 3   487,553   467,562
Year 4   418,343   301,367
Year 5   302,527   194,124
After Year 5   1,006,868   831,053
Loan type   $ 3,181,888   $ 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   $ 545,190   $ 633,749
Year 2   736,125   710,546
Year 3   400,707   409,808
Year 4   293,152   248,325
Year 5   190,845   138,730
After Year 5   596,397   578,639
Loan type   $ 2,762,416   $ 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   $ 1,228,178   $ 1,485,771
Year 2   1,663,421   1,512,643
Year 3   832,914   879,450
Year 4   629,965   563,941
Year 5   429,317   362,715
After Year 5   1,399,953   1,398,737
Loan type   $ 6,183,748   $ 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   $ 2,156,208   $ 2,451,367
Year 2   2,914,778   2,432,272
Year 3   1,398,902   1,428,427
Year 4   1,077,965   955,803
Year 5   771,166   678,427
After Year 5   2,582,928   2,451,798
Loan type   $ 10,901,947   $ 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   $ 4,309,428   $ 5,024,592
Year 2   5,901,069   5,321,510
Year 3   3,120,076   3,185,247
Year 4   2,419,425   2,069,436
Year 5   1,693,855   1,373,996
After Year 5   5,586,146   5,260,227
Loan type   $ 23,029,999   $ 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   $ 2,482,324   $ 2,860,113
Year 2   2,429,263   774,471
Year 3   428,769   499,812
Year 4   303,105   280,154
Year 5   180,906   159,762
After Year 5   308,627   324,506
Loan type   $ 6,132,994   $ 4,898,818
% of Balance        
Seasoning based on monthly scheduled payments due from 1-12 payments   27.00%   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   1,116,198   2,729,334
Year 3   1,155,528   372,496
Year 4   217,601   191,989
Year 5   140,598   122,938
After Year 5   333,972   340,556
Loan type   $ 2,963,897   $ 3,757,313
% of Balance        
Seasoning based on monthly scheduled payments due from 13 - 24 payments   13.00%   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   610,015   1,564,157
Year 4   941,554   254,068
Year 5   139,939   110,952
After Year 5   406,873   429,127
Loan type   $ 2,098,381   $ 2,358,304
% of Balance        
Seasoning based on monthly scheduled payments due from 25 - 36 payments   9.00%   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   437,010   987,977
Year 5   682,053   170,051
After Year 5   471,829   451,494
Loan type   $ 1,590,892   $ 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   278,374   625,916
After Year 5   3,559,693   3,262,308
Loan type   $ 3,838,067   $ 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   $ 1,827,104   $ 2,164,479
Year 2   2,355,608   1,817,705
Year 3   925,764   748,782
Year 4   520,155   355,248
Year 5   271,985   184,377
After Year 5   505,152   452,236
Loan type   $ 6,405,768   $ 5,722,827
% of Balance        
Seasoning based on monthly scheduled payments due from not yet in repayment   27.00%   26.00%