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Allowance for Credit Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Current period gross charge-offs, total $ (50,028)   $ (46,505) $ (105,344) $ (117,454)  
Current period recoveries, total 6,978   6,868 14,682 16,386  
Net charge-offs (43,050)   $ (39,637) (90,662) $ (101,068)  
Consumer Portfolio Segment | Student Loan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Current fiscal year gross charge-offs (105)          
One year before current fiscal year gross charge-offs (2,381) $ (1,087)        
Two years before current fiscal year gross charge-offs (9,337) (10,940)        
Three years before current fiscal year gross charge-offs (15,085) (27,000)        
Four years before current fiscal year gross charge-offs (16,485) (35,851)        
Five years before current fiscal year gross charge-offs (61,646) (36,416)        
Six years before current fiscal year gross charge-offs   (94,032)        
Current period gross charge-offs, total (105,039) (205,326)        
Current fiscal year recoveries 0          
One year before current fiscal year recoveries 124 42        
Two years before current fiscal year recoveries 850 636        
Three years before current fiscal year recoveries 1,722 2,274        
Four years before current fiscal year recoveries 2,109 3,585        
Five years before current fiscal year recoveries 9,870 4,284        
Six years before current fiscal year recoveries   13,200        
Current period recoveries, total 14,675 24,021        
Current fiscal year net charge-offs (105)          
One year before current fiscal year net charge-offs (2,257) (1,045)        
Two years before current fiscal year net charge-offs (8,487) (10,304)        
Three years before current fiscal year net charge-offs (13,363) (24,726)        
Four years before current fiscal year net charge-offs (14,376) (32,266)        
Five years before current fiscal year net charge-offs (51,776) (32,132)        
Six years before current fiscal year net charge-offs   (80,832)        
Net charge-offs (90,364) $ (181,305)        
Total accrued interest by origination vintage, 2021 23,950     23,950    
Total accrued interest by origination vintage, 2020 200,985     200,985   $ 90,438
Total accrued interest by origination vintage, 2019 312,566     312,566   265,688
Total accrued interest by origination vintage, 2018 258,207     258,207   252,251
Total accrued interest by origination vintage, 2017 197,977     197,977   209,178
Total accrued interest by origination vintage, 2016 and prior 311,955     311,955   141,094
Total accrued interest by origination vintage, 2015 and prior           210,247
Total accrued interest by origination vintage 1,305,640     1,305,640   1,168,896
Consumer Portfolio Segment | Student Loan | With Cosigner            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 970,402     970,402    
2020 3,931,236     3,931,236   2,915,328
2019 3,237,783     3,237,783   3,467,219
2018 2,340,257     2,340,257   2,556,400
2017 2,043,013     2,043,013   2,262,635
2016 and prior 5,496,367     5,496,367   1,977,952
2015 and Prior           4,198,748
Total $ 18,019,058     $ 18,019,058   $ 17,378,282
Private education loans 88.00%     88.00%   88.00%
Consumer Portfolio Segment | Student Loan | Without Cosigner            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 211,824     $ 211,824    
2020 618,647     618,647   $ 527,437
2019 505,024     505,024   559,629
2018 341,619     341,619   384,111
2017 247,444     247,444   277,159
2016 and prior 534,141     534,141   211,270
2015 and Prior           391,449
Total $ 2,458,699     $ 2,458,699   $ 2,351,055
Private education loans 12.00%     12.00%   12.00%
Consumer Portfolio Segment | Student Loan | Cosigners            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 1,182,226     $ 1,182,226    
2020 4,549,883     4,549,883   $ 3,442,765
2019 3,742,807     3,742,807   4,026,848
2018 2,681,876     2,681,876   2,940,511
2017 2,290,457     2,290,457   2,539,794
2016 and prior 6,030,508     6,030,508   2,189,222
2015 and Prior           4,590,197
Total $ 20,477,757     $ 20,477,757   $ 19,729,337
Total in percent 100.00%     100.00%   100.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 1,182,226     $ 1,182,226    
2020 4,549,883     4,549,883   $ 3,442,765
2019 3,742,807     3,742,807   4,026,848
2018 2,681,876     2,681,876   2,940,511
2017 2,290,457     2,290,457   2,539,794
2016 and prior 6,030,508     6,030,508   2,189,222
2015 and Prior           4,590,197
Total $ 20,477,757     $ 20,477,757   $ 19,729,337
Total in percent 100.00%     100.00%   100.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | Less than 670            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 72,850     $ 72,850    
2020 253,187     253,187   $ 195,214
2019 280,455     280,455   290,711
2018 213,139     213,139   225,276
2017 183,920     183,920   197,948
2016 and prior 483,561     483,561   162,413
2015 and Prior           369,609
Total $ 1,487,112     $ 1,487,112   $ 1,441,171
Private education loans at origination 7.00%     7.00%   7.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | 670-699            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 160,561     $ 160,561    
2020 605,523     605,523   $ 464,785
2019 563,313     563,313   594,950
2018 410,869     410,869   441,357
2017 374,958     374,958   407,394
2016 and prior 1,011,060     1,011,060   351,303
2015 and Prior           771,477
Total $ 3,126,284     $ 3,126,284   $ 3,031,266
Private education loans at origination 15.00%     15.00%   16.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | 700-749            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 382,823     $ 382,823    
2020 1,466,071     1,466,071   $ 1,111,373
2019 1,225,698     1,225,698   1,310,390
2018 887,632     887,632   967,802
2017 766,167     766,167   846,983
2016 and prior 2,029,007     2,029,007   740,028
2015 and Prior           1,533,517
Total $ 6,757,398     $ 6,757,398   $ 6,510,093
Private education loans at origination 33.00%     33.00%   33.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | Greater than or equal to 750            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 565,992     $ 565,992    
2020 2,225,102     2,225,102   $ 1,671,393
2019 1,673,341     1,673,341   1,830,797
2018 1,170,236     1,170,236   1,306,076
2017 965,412     965,412   1,087,469
2016 and prior 2,506,880     2,506,880   935,478
2015 and Prior           1,915,594
Total $ 9,106,963     $ 9,106,963   $ 8,746,807
Private education loans at origination 45.00%     45.00%   44.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 1,182,226     $ 1,182,226    
2020 4,549,883     4,549,883   $ 3,442,765
2019 3,742,807     3,742,807   4,026,848
2018 2,681,876     2,681,876   2,940,511
2017 2,290,457     2,290,457   2,539,794
2016 and prior 6,030,508     6,030,508   2,189,222
2015 and Prior           4,590,197
Total $ 20,477,757     $ 20,477,757   $ 19,729,337
Total in percent 100.00%     100.00%   100.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | Less than 670            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 85,949     $ 85,949    
2020 274,820     274,820   $ 240,154
2019 285,457     285,457   331,229
2018 254,743     254,743   301,784
2017 253,135     253,135   298,195
2016 and prior 832,185     832,185   293,077
2015 and Prior           734,599
Total $ 1,986,289     $ 1,986,289   $ 2,199,038
Private education loans at origination 10.00%     10.00%   11.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | 670-699            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 155,903     $ 155,903    
2020 520,662     520,662   $ 438,665
2019 426,727     426,727   493,135
2018 294,368     294,368   336,966
2017 246,577     246,577   283,906
2016 and prior 659,428     659,428   231,759
2015 and Prior           504,779
Total $ 2,303,665     $ 2,303,665   $ 2,289,210
Private education loans at origination 11.00%     11.00%   12.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | 700-749            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 386,736     $ 386,736    
2020 1,431,445     1,431,445   $ 1,102,666
2019 1,154,717     1,154,717   1,248,806
2018 787,467     787,467   871,677
2017 656,960     656,960   734,222
2016 and prior 1,652,346     1,652,346   603,160
2015 and Prior           1,220,468
Total $ 6,069,671     $ 6,069,671   $ 5,780,999
Private education loans at origination 30.00%     30.00%   29.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | Greater than or equal to 750            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 553,638     $ 553,638    
2020 2,322,956     2,322,956   $ 1,661,280
2019 1,875,906     1,875,906   1,953,678
2018 1,345,298     1,345,298   1,430,084
2017 1,133,785     1,133,785   1,223,471
2016 and prior 2,886,549     2,886,549   1,061,226
2015 and Prior           2,130,351
Total $ 10,118,132     $ 10,118,132   $ 9,460,090
Private education loans at origination 49.00%     49.00%   48.00%
Consumer Portfolio Segment | Student Loan | Seasoning            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 $ 1,182,226     $ 1,182,226    
2020 4,549,883     4,549,883   $ 3,442,765
2019 3,742,807     3,742,807   4,026,848
2018 2,681,876     2,681,876   2,940,511
2017 2,290,457     2,290,457   2,539,794
2016 and prior 6,030,508     6,030,508   2,189,222
2015 and Prior           4,590,197
Total $ 20,477,757     $ 20,477,757   $ 19,729,337
Seasoning based on monthly scheduled payments due from 1-12 payments 24.00%     24.00%   23.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments 16.00%     16.00%   17.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments 11.00%     11.00%   12.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments 8.00%     8.00%   9.00%
Seasoning based on monthly scheduled payments due from more than 48 payments 15.00%     15.00%   15.00%
Seasoning based on monthly scheduled payments due from not yet in repayment 26.00%     26.00%   24.00%
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]            
2021 $ 667,707     $ 667,707    
2020 2,362,092     2,362,092   $ 2,068,517
2019 438,639     438,639   600,038
2018 393,882     393,882   469,143
2017 377,838     377,838   472,258
2016 and prior 667,673     667,673   381,197
2015 and Prior           507,343
Total 4,907,831     4,907,831   4,498,496
Consumer Portfolio Segment | Student Loan | Seasoning | 13-24 payments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 0     0    
2020 460,402     460,402   163
2019 1,879,307     1,879,307   2,096,635
2018 223,055     223,055   383,977
2017 219,685     219,685   223,332
2016 and prior 572,401     572,401   217,379
2015 and Prior           425,345
Total 3,354,850     3,354,850   3,346,831
Consumer Portfolio Segment | Student Loan | Seasoning | 25-36 payments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 0     0    
2020 0     0   0
2019 260,827     260,827   0
2018 1,254,251     1,254,251   1,353,567
2017 207,771     207,771   370,250
2016 and prior 555,597     555,597   181,940
2015 and Prior           439,337
Total 2,278,446     2,278,446   2,345,094
Consumer Portfolio Segment | Student Loan | Seasoning | 37-48 payments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 0     0    
2020 0     0   0
2019 0     0   0
2018 169,088     169,088   0
2017 933,712     933,712   965,476
2016 and prior 553,180     553,180   351,433
2015 and Prior           402,552
Total 1,655,980     1,655,980   1,719,461
Consumer Portfolio Segment | Student Loan | Seasoning | More than 48 payments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 0     0    
2020 0     0   0
2019 0     0   0
2018 0     0   0
2017 112,835     112,835   0
2016 and prior 2,968,608     2,968,608   729,510
2015 and Prior           2,310,905
Total 3,081,443     3,081,443   3,040,415
Consumer Portfolio Segment | Student Loan | Seasoning | Not yet in repayment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 514,519     514,519    
2020 1,727,389     1,727,389   1,374,085
2019 1,164,034     1,164,034   1,330,175
2018 641,600     641,600   733,824
2017 438,616     438,616   508,478
2016 and prior 713,049     713,049   327,763
2015 and Prior           504,715
Total $ 5,199,207     $ 5,199,207   $ 4,779,040