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Allowance for Credit Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current period gross charge-offs, total $ (55,316) $ (70,949)  
Current period recoveries, total 7,704 9,518  
Net charge-offs (47,612) $ (61,431)  
Consumer Portfolio Segment | Student Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 418,103    
2020 2,747,747   $ 2,043,033
2019 2,491,380   2,573,228
2018 1,955,468   2,045,012
2017 1,755,863   1,850,539
2016 and prior 5,102,866   1,685,572
2015 and Prior     3,701,564
Total 14,471,427   13,898,948
Current period gross charge-offs (6)    
Current period gross charge-offs (911)   (1,087)
Current period gross charge-offs (4,483)   (10,940)
Current period gross charge-offs (8,116)   (27,000)
Current period gross charge-offs (8,793)   (35,851)
Current period gross charge-offs (32,830)   (36,416)
Current period gross charge-offs     (94,032)
Current period gross charge-offs, total (55,139)   (205,326)
Current period recoveries 0    
Current period recoveries 43   42
Current period recoveries 452   636
Current period recoveries 1,009   2,274
Current period recoveries 1,133   3,585
Current period recoveries 5,066   4,284
Current period recoveries     13,200
Current period recoveries, total 7,703   24,021
Current period net charge-offs (6)    
Current period net charge-offs (868)   (1,045)
Current period net charge-offs (4,031)   (10,304)
Current period net charge-offs (7,107)   (24,726)
Current period net charge-offs (7,660)   (32,266)
Current period net charge-offs (27,764)   (32,132)
Current period net charge-offs     (80,832)
Net charge-offs (47,436)   (181,305)
Total accrued interest by origination vintage, 2021 8,317    
Total accrued interest by origination vintage, 2020 147,329   90,438
Total accrued interest by origination vintage, 2019 291,579   265,688
Total accrued interest by origination vintage, 2018 258,813   252,251
Total accrued interest by origination vintage, 2017 206,734   209,178
Total accrued interest by origination vintage, 2016 and prior 335,703   141,094
Total accrued interest by origination vintage, 2015 and prior     210,247
Total accrued interest by origination vintage 1,248,475   1,168,896
Consumer Portfolio Segment | Student Loan | With Cosigner      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 640,909    
2020 3,954,261   2,915,328
2019 3,331,066   3,467,219
2018 2,431,585   2,556,400
2017 2,137,418   2,262,635
2016 and prior 5,799,561   1,977,952
2015 and Prior     4,198,748
Total $ 18,294,800   $ 17,378,282
Private education loans 88.00%   88.00%
Consumer Portfolio Segment | Student Loan | Without Cosigner      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 109,163    
2020 623,156   $ 527,437
2019 531,211   559,629
2018 359,769   384,111
2017 259,981   277,159
2016 and prior 563,760   211,270
2015 and Prior     391,449
Total $ 2,447,040   $ 2,351,055
Private education loans 12.00%   12.00%
Consumer Portfolio Segment | Student Loan | Cosigners      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 750,072    
2020 4,577,417   $ 3,442,765
2019 3,862,277   4,026,848
2018 2,791,354   2,940,511
2017 2,397,399   2,539,794
2016 and prior 6,363,321   2,189,222
2015 and Prior     4,590,197
Total $ 20,741,840   $ 19,729,337
Total in percent 100.00%   100.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 750,072    
2020 4,577,417   $ 3,442,765
2019 3,862,277   4,026,848
2018 2,791,354   2,940,511
2017 2,397,399   2,539,794
2016 and prior 6,363,321   2,189,222
2015 and Prior     4,590,197
Total $ 20,741,840   $ 19,729,337
Total in percent 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 $ 46,437    
2020 253,657   $ 195,214
2019 283,992   290,711
2018 217,921   225,276
2017 189,704   197,948
2016 and prior 505,347   162,413
2015 and Prior     369,609
Total $ 1,497,058   $ 1,441,171
Private education loans at origination 7.00%   7.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | 670-699      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 103,191    
2020 607,789   $ 464,785
2019 576,077   594,950
2018 423,618   441,357
2017 388,607   407,394
2016 and prior 1,061,435   351,303
2015 and Prior     771,477
Total $ 3,160,717   $ 3,031,266
Private education loans at origination 15.00%   16.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | 700-749      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 243,607    
2020 1,472,919   $ 1,111,373
2019 1,260,902   1,310,390
2018 921,338   967,802
2017 799,597   846,983
2016 and prior 2,138,263   740,028
2015 and Prior     1,533,517
Total $ 6,836,626   $ 6,510,093
Private education loans at origination 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 $ 356,837    
2020 2,243,052   $ 1,671,393
2019 1,741,306   1,830,797
2018 1,228,477   1,306,076
2017 1,019,491   1,087,469
2016 and prior 2,658,276   935,478
2015 and Prior     1,915,594
Total $ 9,247,439   $ 8,746,807
Private education loans at origination 45.00%   44.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 750,072    
2020 4,577,417   $ 3,442,765
2019 3,862,277   4,026,848
2018 2,791,354   2,940,511
2017 2,397,399   2,539,794
2016 and prior 6,363,321   2,189,222
2015 and Prior     4,590,197
Total $ 20,741,840   $ 19,729,337
Total in percent 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 $ 64,349    
2020 313,569   $ 240,154
2019 325,235   331,229
2018 290,041   301,784
2017 283,988   298,195
2016 and prior 952,223   293,077
2015 and Prior     734,599
Total $ 2,229,405   $ 2,199,038
Private education loans at origination 11.00%   11.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | 670-699      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 107,242    
2020 573,430   $ 438,665
2019 473,331   493,135
2018 322,446   336,966
2017 271,224   283,906
2016 and prior 707,135   231,759
2015 and Prior     504,779
Total $ 2,454,808   $ 2,289,210
Private education loans at origination 12.00%   12.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | 700-749      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 241,091    
2020 1,442,851   $ 1,102,666
2019 1,186,242   1,248,806
2018 813,884   871,677
2017 684,467   734,222
2016 and prior 1,715,802   603,160
2015 and Prior     1,220,468
Total $ 6,084,337   $ 5,780,999
Private education loans at origination 29.00%   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 $ 337,390    
2020 2,247,567   $ 1,661,280
2019 1,877,469   1,953,678
2018 1,364,983   1,430,084
2017 1,157,720   1,223,471
2016 and prior 2,988,161   1,061,226
2015 and Prior     2,130,351
Total $ 9,973,290   $ 9,460,090
Private education loans at origination 48.00%   48.00%
Consumer Portfolio Segment | Student Loan | Seasoning      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 750,072    
2020 4,577,417   $ 3,442,765
2019 3,862,277   4,026,848
2018 2,791,354   2,940,511
2017 2,397,399   2,539,794
2016 and prior 6,363,321   2,189,222
2015 and Prior     4,590,197
Total $ 20,741,840   $ 19,729,337
Seasoning based on monthly scheduled payments due from 1-12 payments 24.00%   23.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments 16.00%   17.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments 11.00%   12.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments 8.00%   9.00%
Seasoning based on monthly scheduled payments due from more than 48 payments 15.00%   15.00%
Seasoning based on monthly scheduled payments due from not yet in repayment 26.00%   24.00%
Total in percent 100.00%   100.00%
Consumer Portfolio Segment | Student Loan | Seasoning | 1-12 payments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 $ 419,655    
2020 2,510,639   $ 2,068,517
2019 426,229   600,038
2018 396,679   469,143
2017 392,391   472,258
2016 and prior 718,899   381,197
2015 and Prior     507,343
Total 4,864,492   4,498,496
Consumer Portfolio Segment | Student Loan | Seasoning | 13-24 payments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 0    
2020 267,856   163
2019 2,034,191   2,096,635
2018 254,139   383,977
2017 221,863   223,332
2016 and prior 599,435   217,379
2015 and Prior     425,345
Total 3,377,484   3,346,831
Consumer Portfolio Segment | Student Loan | Seasoning | 25-36 payments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 0    
2020 0   0
2019 146,616   0
2018 1,343,321   1,353,567
2017 250,078   370,250
2016 and prior 581,741   181,940
2015 and Prior     439,337
Total 2,321,756   2,345,094
Consumer Portfolio Segment | Student Loan | Seasoning | 37-48 payments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 0    
2020 0   0
2019 0   0
2018 93,298   0
2017 978,808   965,476
2016 and prior 618,454   351,433
2015 and Prior     402,552
Total 1,690,560   1,719,461
Consumer Portfolio Segment | Student Loan | Seasoning | More than 48 payments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 0    
2020 0   0
2019 0   0
2018 0   0
2017 64,660   0
2016 and prior 3,029,214   729,510
2015 and Prior     2,310,905
Total 3,093,874   3,040,415
Consumer Portfolio Segment | Student Loan | Seasoning | Not yet in repayment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 330,417    
2020 1,798,922   1,374,085
2019 1,255,241   1,330,175
2018 703,917   733,824
2017 489,599   508,478
2016 and prior 815,578   327,763
2015 and Prior     504,715
Total $ 5,393,674   $ 4,779,040