XML 66 R50.htm IDEA: XBRL DOCUMENT
v3.20.2

Allowance for Loan Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current period gross charge-offs | $ 46,505 |  | $ 74,627 | $ 117,454 | $ 129,689 |
Current period recoveries | 6,868 |  | 7,384 | 16,386 | 13,990 |
Net charge-offs | (39,637) |  | (67,243) | (101,068) | $ (115,699) |
Personal Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total | 772,086 |  |  | 772,086 |  | $ 1,049,007
Total accrued interest by origination vintage, 2020 | 0 |  |  | 0 |  | 3,431
Total accrued interest by origination vintage, 2019 | 3,850 |  |  | 3,850 |  | 4,166
Total accrued interest by origination vintage, 2018 | 3,977 |  |  | 3,977 |  | 572
Total accrued interest by origination vintage, 2017 | 397 |  |  | 397 |  | 5
Total accrued interest by origination vintage, 2016 | 3 |  |  | 3 |  |
Total accrued interest by origination vintage | 8,227 |  |  | 8,227 |  | 8,174
Consumer Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current period gross charge-offs | 42,490 |  | $ 308 |  |  |
Consumer Portfolio Segment | Student Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 664,058 |  |  | 664,058 |  |
2019 | 3,004,489 |  |  | 3,004,489 |  | 2,340,221
2018 | 2,346,348 |  |  | 2,346,348 |  | 3,159,878
2017 | 2,076,951 |  |  | 2,076,951 |  | 2,781,132
2016 | 1,907,320 |  |  | 1,907,320 |  | 2,566,815
2015 and Prior | 4,191,163 |  |  | 4,191,163 |  | 2,225,721
2014 and Prior |  |  |  |  |  | 3,241,884
Total | 14,190,329 |  |  | 14,190,329 |  | 16,315,651
Current period gross charge-offs, 2020 | (99) | $ (1,697) |  |  |  |
Current period gross charge-offs, 2019 | (3,325) | (14,650) |  |  |  |
Current period gross charge-offs, 2018 | (10,513) | (29,119) |  |  |  |
Current period gross charge-offs, 2017 | (14,602) | (40,576) |  |  |  |
Current period gross charge-offs, 2016 | (15,397) | (41,141) |  |  |  |
Current period gross charge-offs, 2015 and prior | (39,312) | (81,795) |  |  |  |
Current period gross charge-offs | 83,248 | 208,978 |  |  |  |
Current period recoveries, 2020 | 0 | 69 |  |  |  |
Current period recoveries, 2019 | 221 | 1,016 |  |  |  |
Current period recoveries, 2018 | 1,178 | 2,622 |  |  |  |
Current period recoveries, 2017 | 1,988 | 4,431 |  |  |  |
Current period recoveries, 2016 | 2,506 | 5,175 |  |  |  |
Current period recoveries, 2015 and prior | 7,615 | 12,452 |  |  |  |
Current period recoveries | 13,508 | 25,765 |  |  |  |
Current period net charge-offs, 2020 | (99) | (1,628) |  |  |  |
Current period net charge-offs, 2019 | (3,104) | (13,634) |  |  |  |
Current period net charge-offs, 2018 | (9,335) | (26,497) |  |  |  |
Current period net charge-offs, 2017 | (12,614) | (36,145) |  |  |  |
Current period net charge-offs, 2016 | (12,891) | (35,966) |  |  |  |
Current period net charge-offs, 2015 and prior | (31,697) | (69,343) |  |  |  |
Net charge-offs | (69,740) | $ (183,213) |  |  |  |
Total accrued interest by origination vintage, 2020 | 24,602 |  |  | 24,602 |  | 116,423
Total accrued interest by origination vintage, 2019 | 248,904 |  |  | 248,904 |  | 321,568
Total accrued interest by origination vintage, 2018 | 307,765 |  |  | 307,765 |  | 327,002
Total accrued interest by origination vintage, 2017 | 287,159 |  |  | 287,159 |  | 261,083
Total accrued interest by origination vintage, 2016 | 215,989 |  |  | 215,989 |  | 165,764
Total accrued interest by origination vintage, 2015 and prior | 281,753 |  |  | 281,753 |  | 174,318
Total accrued interest by origination vintage | 1,366,172 |  |  | 1,366,172 |  | 1,366,158
Consumer Portfolio Segment | Student Loan | With Cosigner |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 985,808 |  |  | 985,808 |  |
2019 | 4,513,841 |  |  | 4,513,841 |  | 3,475,256
2018 | 3,244,267 |  |  | 3,244,267 |  | 4,303,772
2017 | 2,790,768 |  |  | 2,790,768 |  | 3,575,973
2016 | 2,434,473 |  |  | 2,434,473 |  | 3,112,873
2015 and Prior | 5,072,593 |  |  | 5,072,593 |  | 2,579,214
2014 and Prior |  |  |  |  |  | 3,662,547
Total | $ 19,041,750 |  |  | $ 19,041,750 |  | $ 20,709,635
Private education loans | 89.00% |  |  | 89.00% |  | 89.00%
Consumer Portfolio Segment | Student Loan | Without Cosigner |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 231,032 |  |  | $ 231,032 |  |
2019 | 671,312 |  |  | 671,312 |  | $ 571,792
2018 | 470,339 |  |  | 470,339 |  | 584,601
2017 | 340,709 |  |  | 340,709 |  | 427,512
2016 | 258,451 |  |  | 258,451 |  | 320,985
2015 and Prior | 471,872 |  |  | 471,872 |  | 241,958
2014 and Prior |  |  |  |  |  | 333,108
Total | $ 2,443,715 |  |  | $ 2,443,715 |  | $ 2,479,956
Private education loans | 11.00% |  |  | 11.00% |  | 11.00%
Consumer Portfolio Segment | Student Loan | Cosigners |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 1,216,840 |  |  | $ 1,216,840 |  |
2019 | 5,185,153 |  |  | 5,185,153 |  | $ 4,047,048
2018 | 3,714,606 |  |  | 3,714,606 |  | 4,888,373
2017 | 3,131,477 |  |  | 3,131,477 |  | 4,003,485
2016 | 2,692,924 |  |  | 2,692,924 |  | 3,433,858
2015 and Prior | 5,544,465 |  |  | 5,544,465 |  | 2,821,172
2014 and Prior |  |  |  |  |  | 3,995,655
Total | $ 21,485,465 |  |  | $ 21,485,465 |  | $ 23,189,591
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] |  |  |  |  |  |
2020 | $ 1,216,840 |  |  | $ 1,216,840 |  |
2019 | 5,185,153 |  |  | 5,185,153 |  | $ 4,047,048
2018 | 3,714,606 |  |  | 3,714,606 |  | 4,888,373
2017 | 3,131,477 |  |  | 3,131,477 |  | 4,003,485
2016 | 2,692,924 |  |  | 2,692,924 |  | 3,433,858
2015 and Prior | 5,544,465 |  |  | 5,544,465 |  | 2,821,172
2014 and Prior |  |  |  |  |  | 3,995,655
Total | $ 21,485,465 |  |  | $ 21,485,465 |  | $ 23,189,591
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] |  |  |  |  |  |
2020 | $ 86,008 |  |  | $ 86,008 |  |
2019 | 363,637 |  |  | 363,637 |  | $ 283,040
2018 | 271,480 |  |  | 271,480 |  | 343,613
2017 | 233,371 |  |  | 233,371 |  | 285,747
2016 | 193,171 |  |  | 193,171 |  | 236,457
2015 and Prior | 431,144 |  |  | 431,144 |  | 203,145
2014 and Prior |  |  |  |  |  | 313,587
Total | $ 1,578,811 |  |  | $ 1,578,811 |  | $ 1,665,589
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] |  |  |  |  |  |
2020 | $ 181,178 |  |  | $ 181,178 |  |
2019 | 758,383 |  |  | 758,383 |  | $ 592,376
2018 | 547,683 |  |  | 547,683 |  | 714,779
2017 | 492,944 |  |  | 492,944 |  | 617,676
2016 | 423,603 |  |  | 423,603 |  | 529,575
2015 and Prior | 920,255 |  |  | 920,255 |  | 439,050
2014 and Prior |  |  |  |  |  | 676,569
Total | $ 3,324,046 |  |  | $ 3,324,046 |  | $ 3,570,025
Private education loans at origination | 16.00% |  |  | 16.00% |  | 16.00%
Consumer Portfolio Segment | Student Loan | FICO at Original Approval | 700-749 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 398,370 |  |  | $ 398,370 |  |
2019 | 1,685,282 |  |  | 1,685,282 |  | $ 1,319,563
2018 | 1,218,105 |  |  | 1,218,105 |  | 1,601,904
2017 | 1,039,210 |  |  | 1,039,210 |  | 1,325,387
2016 | 907,291 |  |  | 907,291 |  | 1,155,253
2015 and Prior | 1,854,579 |  |  | 1,854,579 |  | 944,135
2014 and Prior |  |  |  |  |  | 1,324,506
Total | $ 7,102,837 |  |  | $ 7,102,837 |  | $ 7,670,748
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] |  |  |  |  |  |
2020 | $ 551,284 |  |  | $ 551,284 |  |
2019 | 2,377,851 |  |  | 2,377,851 |  | $ 1,852,069
2018 | 1,677,338 |  |  | 1,677,338 |  | 2,228,077
2017 | 1,365,952 |  |  | 1,365,952 |  | 1,774,675
2016 | 1,168,859 |  |  | 1,168,859 |  | 1,512,573
2015 and Prior | 2,338,487 |  |  | 2,338,487 |  | 1,234,842
2014 and Prior |  |  |  |  |  | 1,680,993
Total | $ 9,479,771 |  |  | $ 9,479,771 |  | $ 10,283,229
Private education loans at origination | 44.00% |  |  | 44.00% |  | 44.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 1,216,840 |  |  | $ 1,216,840 |  |
2019 | 5,185,153 |  |  | 5,185,153 |  | $ 4,047,048
2018 | 3,714,606 |  |  | 3,714,606 |  | 4,888,373
2017 | 3,131,477 |  |  | 3,131,477 |  | 4,003,485
2016 | 2,692,924 |  |  | 2,692,924 |  | 3,433,858
2015 and Prior | 5,544,465 |  |  | 5,544,465 |  | 2,821,172
2014 and Prior |  |  |  |  |  | 3,995,655
Total | $ 21,485,465 |  |  | $ 21,485,465 |  | $ 23,189,591
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] |  |  |  |  |  |
2020 | $ 102,547 |  |  | $ 102,547 |  |
2019 | 476,798 |  |  | 476,798 |  | $ 401,979
2018 | 398,671 |  |  | 398,671 |  | 515,901
2017 | 379,970 |  |  | 379,970 |  | 475,007
2016 | 366,824 |  |  | 366,824 |  | 449,568
2015 and Prior | 927,051 |  |  | 927,051 |  | 419,308
2014 and Prior |  |  |  |  |  | 717,674
Total | $ 2,651,861 |  |  | $ 2,651,861 |  | $ 2,979,437
Private education loans at origination | 12.00% |  |  | 12.00% |  | 13.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | 670-699 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 169,846 |  |  | $ 169,846 |  |
2019 | 673,935 |  |  | 673,935 |  | $ 582,256
2018 | 449,316 |  |  | 449,316 |  | 645,422
2017 | 365,351 |  |  | 365,351 |  | 497,497
2016 | 296,192 |  |  | 296,192 |  | 397,889
2015 and Prior | 613,518 |  |  | 613,518 |  | 308,607
2014 and Prior |  |  |  |  |  | 451,451
Total | $ 2,568,158 |  |  | $ 2,568,158 |  | $ 2,883,122
Private education loans at origination | 12.00% |  |  | 12.00% |  | 13.00%
Consumer Portfolio Segment | Student Loan | School FICO, Refreshed Amounts | 700-749 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 396,337 |  |  | $ 396,337 |  |
2019 | 1,623,733 |  |  | 1,623,733 |  | $ 1,284,867
2018 | 1,108,642 |  |  | 1,108,642 |  | 1,506,849
2017 | 911,600 |  |  | 911,600 |  | 1,199,564
2016 | 754,672 |  |  | 754,672 |  | 994,309
2015 and Prior | 1,466,464 |  |  | 1,466,464 |  | 772,205
2014 and Prior |  |  |  |  |  | 1,048,808
Total | $ 6,261,448 |  |  | $ 6,261,448 |  | $ 6,806,602
Private education loans at origination | 29.00% |  |  | 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] |  |  |  |  |  |
2020 | $ 548,110 |  |  | $ 548,110 |  |
2019 | 2,410,687 |  |  | 2,410,687 |  | $ 1,777,946
2018 | 1,757,977 |  |  | 1,757,977 |  | 2,220,201
2017 | 1,474,556 |  |  | 1,474,556 |  | 1,831,417
2016 | 1,275,236 |  |  | 1,275,236 |  | 1,592,092
2015 and Prior | 2,537,432 |  |  | 2,537,432 |  | 1,321,052
2014 and Prior |  |  |  |  |  | 1,777,722
Total | $ 10,003,998 |  |  | $ 10,003,998 |  | $ 10,520,430
Private education loans at origination | 47.00% |  |  | 47.00% |  | 45.00%
Consumer Portfolio Segment | Student Loan | Seasoning |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 1,216,840 |  |  | $ 1,216,840 |  |
2019 | 5,185,153 |  |  | 5,185,153 |  | $ 4,047,048
2018 | 3,714,606 |  |  | 3,714,606 |  | 4,888,373
2017 | 3,131,477 |  |  | 3,131,477 |  | 4,003,485
2016 | 2,692,924 |  |  | 2,692,924 |  | 3,433,858
2015 and Prior | 5,544,465 |  |  | 5,544,465 |  | 2,821,172
2014 and Prior |  |  |  |  |  | 3,995,655
Total | $ 21,485,465 |  |  | $ 21,485,465 |  | $ 23,189,591
Seasoning based on monthly scheduled payments due from 1-12 payments | 26.00% |  |  | 26.00% |  | 23.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments | 15.00% |  |  | 15.00% |  | 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 | 9.00% |  |  | 9.00% |  | 10.00%
Seasoning based on monthly scheduled payments due from more than 48 payments | 13.00% |  |  | 13.00% |  | 13.00%
Seasoning based on monthly scheduled payments due from not yet in repayment | 26.00% |  |  | 26.00% |  | 25.00%
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] |  |  |  |  |  |
2020 | $ 684,650 |  |  | $ 684,650 |  |
2019 | 2,718,782 |  |  | 2,718,782 |  | $ 2,376,404
2018 | 506,754 |  |  | 506,754 |  | 719,158
2017 | 542,026 |  |  | 542,026 |  | 705,181
2016 | 466,704 |  |  | 466,704 |  | 617,174
2015 and Prior | 695,822 |  |  | 695,822 |  | 462,946
2014 and Prior |  |  |  |  |  | 470,839
Total | 5,614,738 |  |  | 5,614,738 |  | 5,351,702
Consumer Portfolio Segment | Student Loan | Seasoning | 13-24 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 428,312 |  |  | 428,312 |  | 0
2018 | 1,826,430 |  |  | 1,826,430 |  | 2,588,702
2017 | 264,902 |  |  | 264,902 |  | 424,953
2016 | 250,678 |  |  | 250,678 |  | 305,078
2015 and Prior | 544,044 |  |  | 544,044 |  | 285,513
2014 and Prior |  |  |  |  |  | 399,905
Total | 3,314,366 |  |  | 3,314,366 |  | 4,004,151
Consumer Portfolio Segment | Student Loan | Seasoning | 25-36 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 0 |  |  | 0 |  | 0
2018 | 280,873 |  |  | 280,873 |  | 0
2017 | 1,394,821 |  |  | 1,394,821 |  | 1,862,587
2016 | 243,690 |  |  | 243,690 |  | 418,048
2015 and Prior | 528,094 |  |  | 528,094 |  | 227,391
2014 and Prior |  |  |  |  |  | 394,339
Total | 2,447,478 |  |  | 2,447,478 |  | 2,902,365
Consumer Portfolio Segment | Student Loan | Seasoning | 37-48 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 0 |  |  | 0 |  | 0
2018 | 0 |  |  | 0 |  | 0
2017 | 189,174 |  |  | 189,174 |  | 0
2016 | 1,123,215 |  |  | 1,123,215 |  | 1,457,760
2015 and Prior | 522,030 |  |  | 522,030 |  | 413,508
2014 and Prior |  |  |  |  |  | 342,676
Total | 1,834,419 |  |  | 1,834,419 |  | 2,213,944
Consumer Portfolio Segment | Student Loan | Seasoning | More than 48 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 0 |  |  | 0 |  | 0
2018 | 0 |  |  | 0 |  | 0
2017 | 0 |  |  | 0 |  | 0
2016 | 142,975 |  |  | 142,975 |  | 0
2015 and Prior | 2,651,442 |  |  | 2,651,442 |  | 1,056,229
2014 and Prior |  |  |  |  |  | 1,973,795
Total | 2,794,417 |  |  | 2,794,417 |  | 3,030,024
Consumer Portfolio Segment | Student Loan | Seasoning | Not yet in repayment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 532,190 |  |  | 532,190 |  |
2019 | 2,038,059 |  |  | 2,038,059 |  | 1,670,644
2018 | 1,100,549 |  |  | 1,100,549 |  | 1,580,513
2017 | 740,554 |  |  | 740,554 |  | 1,010,764
2016 | 465,662 |  |  | 465,662 |  | 635,798
2015 and Prior | 603,033 |  |  | 603,033 |  | 375,585
2014 and Prior |  |  |  |  |  | 414,101
Total | 5,480,047 |  |  | 5,480,047 |  | 5,687,405
Consumer Portfolio Segment | Student Loan | Loans In Forbearance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 17,801 |  |  | 17,801 |  |
2019 | 123,106 |  |  | 123,106 |  | 21,009
2018 | 222,065 |  |  | 222,065 |  | 108,509
2017 | 248,986 |  |  | 248,986 |  | 142,341
2016 | 248,467 |  |  | 248,467 |  | 146,114
2015 and Prior | 560,160 |  |  | 560,160 |  | 127,799
2014 and Prior |  |  |  |  |  | 168,744
Total | 1,420,585 |  |  | 1,420,585 |  | 714,516
Consumer Portfolio Segment | Personal Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 39 |  |  | 39 |  |
2019 | 305,862 |  |  | 305,862 |  | 400,216
2018 | 353,667 |  |  | 353,667 |  | 522,778
2017 | 54,815 |  |  | 54,815 |  | 99,581
2016 | 613 |  |  | 613 |  | 942
Total | 714,996 |  |  | 714,996 |  | 1,023,517
Consumer Portfolio Segment | Personal Loans | FICO at Original Approval |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 39 |  |  | 39 |  |
2019 | 327,076 |  |  | 327,076 |  | 404,776
2018 | 384,970 |  |  | 384,970 |  | 540,784
2017 | 59,363 |  |  | 59,363 |  | 102,463
2016 | 638 |  |  | 638 |  | 984
Total | $ 772,086 |  |  | $ 772,086 |  | $ 1,049,007
Total in percent | 100.00% |  |  | 100.00% |  | 100.00%
Consumer Portfolio Segment | Personal Loans | FICO at Original Approval | Less than 670 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 0 |  |  | $ 0 |  |
2019 | 6,736 |  |  | 6,736 |  | $ 8,315
2018 | 22,258 |  |  | 22,258 |  | 32,021
2017 | 3,647 |  |  | 3,647 |  | 7,030
2016 | 0 |  |  | 0 |  | 1
Total | $ 32,641 |  |  | $ 32,641 |  | $ 47,367
Private education loans at origination | 4.00% |  |  | 4.00% |  | 4.00%
Consumer Portfolio Segment | Personal Loans | FICO at Original Approval | 670-699 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 0 |  |  | $ 0 |  |
2019 | 63,228 |  |  | 63,228 |  | $ 77,746
2018 | 109,253 |  |  | 109,253 |  | 152,909
2017 | 15,818 |  |  | 15,818 |  | 28,384
2016 | 33 |  |  | 33 |  | 59
Total | $ 188,332 |  |  | $ 188,332 |  | $ 259,098
Private education loans at origination | 25.00% |  |  | 25.00% |  | 25.00%
Consumer Portfolio Segment | Personal Loans | FICO at Original Approval | 700-749 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 39 |  |  | $ 39 |  |
2019 | 176,293 |  |  | 176,293 |  | $ 217,642
2018 | 181,925 |  |  | 181,925 |  | 255,374
2017 | 28,432 |  |  | 28,432 |  | 48,254
2016 | 368 |  |  | 368 |  | 586
Total | $ 387,057 |  |  | $ 387,057 |  | $ 521,856
Private education loans at origination | 50.00% |  |  | 50.00% |  | 50.00%
Consumer Portfolio Segment | Personal Loans | FICO at Original Approval | Greater than or equal to 750 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 0 |  |  | $ 0 |  |
2019 | 80,819 |  |  | 80,819 |  | $ 101,073
2018 | 71,534 |  |  | 71,534 |  | 100,480
2017 | 11,466 |  |  | 11,466 |  | 18,795
2016 | 237 |  |  | 237 |  | 338
Total | $ 164,056 |  |  | $ 164,056 |  | $ 220,686
Private education loans at origination | 21.00% |  |  | 21.00% |  | 21.00%
Consumer Portfolio Segment | Personal Loans | Seasoning |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 39 |  |  | $ 39 |  |
2019 | 327,076 |  |  | 327,076 |  | $ 404,776
2018 | 384,970 |  |  | 384,970 |  | 540,784
2017 | 59,363 |  |  | 59,363 |  | 102,463
2016 | 638 |  |  | 638 |  | 984
Total | $ 772,086 |  |  | $ 772,086 |  | $ 1,049,007
Seasoning based on monthly scheduled payments due from 1-12 payments | 30.00% |  |  | 30.00% |  |
Seasoning based on monthly scheduled payments due from 13 - 24 payments | 44.00% |  |  | 44.00% |  |
Seasoning based on monthly scheduled payments due from 25 - 36 payments | 26.00% |  |  | 26.00% |  |
Seasoning based on monthly scheduled payments due from 37 - 48 payments | 0.00% |  |  | 0.00% |  |
Seasoning based on monthly scheduled payments due from more than 48 payments | 0.00% |  |  | 0.00% |  |
Total in percent | 100.00% |  |  | 100.00% |  | 100.00%
Consumer Portfolio Segment | Personal Loans | Seasoning | 1-12 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | $ 39 |  |  | $ 39 |  |
2019 | 230,341 |  |  | 230,341 |  | $ 404,776
2018 | 251 |  |  | 251 |  | 65,164
2017 | 0 |  |  | 0 |  | 0
2016 | 0 |  |  | 0 |  | 0
Total | 230,631 |  |  | 230,631 |  | $ 469,940
Seasoning based on monthly scheduled payments due from 1-12 payments |  |  |  |  |  | 45.00%
Consumer Portfolio Segment | Personal Loans | Seasoning | 13-24 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 96,735 |  |  | 96,735 |  | $ 0
2018 | 243,781 |  |  | 243,781 |  | 475,620
2017 | 0 |  |  | 0 |  | 29,698
2016 | 0 |  |  | 0 |  | 0
Total | 340,516 |  |  | 340,516 |  | $ 505,318
Seasoning based on monthly scheduled payments due from 13 - 24 payments |  |  |  |  |  | 48.00%
Consumer Portfolio Segment | Personal Loans | Seasoning | 25-36 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 0 |  |  | 0 |  | $ 0
2018 | 140,938 |  |  | 140,938 |  | 0
2017 | 56,281 |  |  | 56,281 |  | 72,765
2016 | 0 |  |  | 0 |  | 984
Total | 197,219 |  |  | 197,219 |  | $ 73,749
Seasoning based on monthly scheduled payments due from 25 - 36 payments |  |  |  |  |  | 7.00%
Consumer Portfolio Segment | Personal Loans | Seasoning | 37-48 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 0 |  |  | 0 |  | $ 0
2018 | 0 |  |  | 0 |  | 0
2017 | 3,082 |  |  | 3,082 |  | 0
2016 | 638 |  |  | 638 |  | 0
Total | 3,720 |  |  | 3,720 |  | $ 0
Seasoning based on monthly scheduled payments due from 37 - 48 payments |  |  |  |  |  | 0.00%
Consumer Portfolio Segment | Personal Loans | Seasoning | More than 48 payments |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 0 |  |  | 0 |  | $ 0
2018 | 0 |  |  | 0 |  | 0
2017 | 0 |  |  | 0 |  | 0
2016 | 0 |  |  | 0 |  | 0
Total | 0 |  |  | 0 |  | $ 0
Seasoning based on monthly scheduled payments due from more than 48 payments |  |  |  |  |  | 0.00%
Consumer Portfolio Segment | Personal Loans | Loans In Forbearance |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
2020 | 0 |  |  | 0 |  |
2019 | 17,037 |  |  | 17,037 |  | $ 0
2018 | 23,214 |  |  | 23,214 |  | 0
2017 | 3,646 |  |  | 3,646 |  | 0
2016 | 25 |  |  | 25 |  | 0
Total | $ 43,922 |  |  | 43,922 |  | 0
Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current period gross charge-offs, 2020 |  |  |  |  |  | (2,350)
Current period gross charge-offs, 2019 |  |  |  |  |  | (58,134)
Current period gross charge-offs, 2018 |  |  |  |  |  | (13,693)
Current period gross charge-offs, 2017 |  |  |  |  |  | (136)
Current period gross charge-offs |  |  |  |  |  | 74,313
Current period recoveries, 2020 |  |  |  |  |  | 48
Current period recoveries, 2019 |  |  |  |  |  | 3,397
Current period recoveries, 2018 |  |  |  |  |  | 1,722
Current period recoveries, 2017 |  |  |  |  |  | 39
Current period recoveries |  |  |  |  |  | 5,206
Current period net charge-offs, 2020 |  |  |  |  |  | (2,302)
Current period net charge-offs, 2019 |  |  |  |  |  | (54,737)
Current period net charge-offs, 2018 |  |  |  |  |  | (11,971)
Current period net charge-offs, 2017 |  |  |  |  |  | (97)
Net charge-offs |  |  |  |  |  | $ (69,107)
Commercial Portfolio Segment | Personal Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current period gross charge-offs, 2020 |  |  |  | 0 |  |
Current period gross charge-offs, 2019 |  |  |  | (6,623) |  |
Current period gross charge-offs, 2018 |  |  |  | (22,881) |  |
Current period gross charge-offs, 2017 |  |  |  | (4,294) |  |
Current period gross charge-offs, 2016 |  |  |  | (50) |  |
Current period gross charge-offs |  |  |  | 33,848 |  |
Current period recoveries, 2020 |  |  |  | 0 |  |
Current period recoveries, 2019 |  |  |  | 67 |  |
Current period recoveries, 2018 |  |  |  | 2,091 |  |
Current period recoveries, 2017 |  |  |  | 701 |  |
Current period recoveries, 2016 |  |  |  | 19 |  |
Current period recoveries |  |  |  | 2,878 |  |
Current period net charge-offs, 2020 |  |  |  | 0 |  |
Current period net charge-offs, 2019 |  |  |  | (6,556) |  |
Current period net charge-offs, 2018 |  |  |  | (20,790) |  |
Current period net charge-offs, 2017 |  |  |  | (3,593) |  |
Current period net charge-offs, 2016 |  |  |  | (31) |  |
Net charge-offs |  |  |  | $ (30,970) |  |

X
- Definition Financing Receivable, Accrued Interest, Origination Interest, Originated Five or More Years before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationInterestOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Accrued Interest, Origination Vintage, before Allowance for Credit Loss + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationVintageBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Accrued interest, Origination Vintage, Originated Four Years before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationVintageOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Accrued Interest, Origination Vintage, Originated in Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationVintageOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Accrued Interest, Origination Vintage, Originated in Fiscal Year before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationVintageOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Accrued interest, Origination Vintage, Originated Three Years before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationVintageOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Accrued interest, Origination Vintage, Originated Two Years before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAccruedInterestOriginationVintageOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Allowance for Credit Loss, Recovery, Originated Five Or More Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossRecoveryOriginatedFiveOrMoreYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Recovery, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossRecoveryOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Recovery, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossRecoveryOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Recovery, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossRecoveryOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Recovery, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossRecoveryOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Recovery, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossRecoveryOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Five Or More Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryOriginatedFiveOrMoreYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, Originated Five Or More Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, Originated Four Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, Originated Three Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Allowance for Credit Loss, Writeoff, Originated Two Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableAllowanceForCreditLossWriteoffOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Originated Six or More Years before Latest Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableOriginatedSixOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percent of private loans + References No definition available. + Details
Name: | slm_PercentOfPrivateLoans
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Private Education Loans At Origination + References No definition available. + Details
Name: | slm_PrivateEducationLoansAtOrigination
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Private education loans gross in percent. + References No definition available. + Details
Name: | slm_PrivateEducationLoansGrossPercentage
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Seasoning based on monthly scheduled payments due from more than forty eight payments in percent + References No definition available. + Details
Name: | slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromMoreThanFortyEightPaymentsInPercent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Seasoning based on monthly scheduled payments due from not yet in repayment in percent + References No definition available. + Details
Name: | slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromNotYetInRepaymentInPercent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Seasoning based on monthly scheduled payments due from one to twelve payments in percent. + References No definition available. + Details
Name: | slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromOneToTwelvePaymentsInPercent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Seasoning based on monthly scheduled payments due from thirteen to twenty four payments in percent. + References No definition available. + Details
Name: | slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromThirteenToTwentyFourPaymentsInPercent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Seasoning based on monthly scheduled payments due from thirty seven to forty eight payments in percent. + References No definition available. + Details
Name: | slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromThirtySevenToFortyEightPaymentsInPercent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Seasoning based on monthly scheduled payments due from thirteen to twenty four payments in percent + References No definition available. + Details
Name: | slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromTwentyFiveToThirtySixPaymentsInPercent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of financing receivable originated more than five years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated four years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in fiscal year prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated two years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=slm_PersonalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_StudentLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_WithCosignerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_WithoutCosignerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_CosignerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_SchoolFicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditScoreFicoAxis=slm_FICOscorelessthan670Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditScoreFicoAxis=slm_FICOscore670699Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditScoreFicoAxis=slm_FICOscore700749Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditScoreFicoAxis=slm_FICOscoregreaterthan750Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_SchoolFICORefreshedAmountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_RepaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromOneToTwelvePaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromThirteenToTwentyFourPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromTwentyFiveToThirtySixPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromThirtySevenToFortyEightPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromMoreThanFortyEightPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=slm_SeasoningBasedOnMonthlyScheduledPaymentsDueFromNotYetInRepaymentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | slm_CreditQualityIndicatorsAxis=slm_LoansInForbearanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |