XML 67 R51.htm IDEA: XBRL DOCUMENT
v3.20.2

Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private Education Loans allowance for losses | $ (1,929,323) | $ (1,673,324) | $ (441,912) | $ (441,912) | $ (383,997) | $ (358,325) | $ (341,121)
Loans held for investment, net | $ 21,163,931 |  |  | $ 24,667,792 |  |  |
Percentage of Private Education Loans in repayment, 2020 | 54.80% |  |  | 58.20% |  |  |
Percentage of Private Education Loans in repayment, 2019 | 58.30% |  |  | 65.40% |  |  |
Percentage of Private Education Loans in repayment, 2018 | 64.20% |  |  | 71.20% |  |  |
Percentage of Private Education Loans in repayment, 2017 | 68.00% |  |  | 77.20% |  |  |
Percentage of Private Education Loans in repayment, 2016 | 73.00% |  |  | 82.20% |  |  |
Percentage of Private Education Loans in repayment, 2015 and prior | 78.40% |  |  | 85.40% |  |  |
Percentage of Private Education Loans in repayment | 67.50% |  |  | 72.40% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2020 | 0.40% |  |  | 0.60% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2019 | 0.60% |  |  | 1.20% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2018 | 1.60% |  |  | 2.40% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2017 | 2.50% |  |  | 3.20% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2016 | 2.90% |  |  | 4.00% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2015 and prior | 3.60% |  |  | 5.00% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment | 2.20% |  |  | 2.80% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans, 2020 | 0.40% |  |  | 0.60% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans, 2019 | 0.60% |  |  | 1.20% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans, 2018 | 1.90% |  |  | 2.40% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans, 2017 | 3.00% |  |  | 3.20% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans, 2016 | 3.60% |  |  | 4.00% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans, 2015 and Prior | 4.30% |  |  | 5.00% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment and delinquent forbearance loans | 2.70% |  |  | 2.80% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2020 | 2.60% |  |  | 0.90% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2019 | 4.00% |  |  | 3.30% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2018 | 8.80% |  |  | 4.80% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2017 | 10.90% |  |  | 5.20% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2016 | 11.80% |  |  | 5.20% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2015 and Prior | 12.00% |  |  | 4.70% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 9.30% |  |  | 4.10% |  |  |
Consumer Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private Education Loans allowance for losses | $ (85,958) | $ (29,707) |  |  | $ (755) | $ (295) |
Personal Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 772,086 |  |  | $ 1,049,007 |  |  |
Private Education Loans allowance for losses | (163,337) |  | $ (65,877) | (65,877) |  |  |
Loans held for investment, net | 609,051 |  |  | 983,643 |  |  |
Personal Loans | Consumer Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 39 |  |  |  |  |  |
2019 | 305,862 |  |  | 400,216 |  |  |
2018 | 353,667 |  |  | 522,778 |  |  |
2017 | 54,815 |  |  | 99,581 |  |  |
2016 | 613 |  |  | 942 |  |  |
Total | $ 714,996 |  |  | $ 1,023,517 |  |  |
Loans current | 98.30% |  |  | 97.60% |  |  |
Loans in repayment | 100.00% |  |  | 100.00% |  |  |
Total Private Education Loans in repayment, 2020 | $ 39 |  |  |  |  |  |
Total Private Education Loans in repayment, 2019 | 309,577 |  |  | $ 404,776 |  |  |
Total Private Education Loans in repayment, 2018 | 361,269 |  |  | 540,784 |  |  |
Total Private Education Loans in repayment, 2017 | 55,716 |  |  | 102,464 |  |  |
Total Private Education Loans in repayment, 2016 | 613 |  |  | 983 |  |  |
Total Private Education Loans in repayment | 727,214 |  |  | 1,049,007 |  |  |
Total Private Education Loans, gross, 2020 | 39 |  |  |  |  |  |
Total Private Education Loans, gross, 2019 | 327,075 |  |  | 404,776 |  |  |
Total Private Education Loans, gross, 2018 | 384,972 |  |  | 540,784 |  |  |
Total Private Education Loans, gross, 2017 | 59,362 |  |  | 102,464 |  |  |
Total Private Education Loans, gross, 2016 | 638 |  |  | 983 |  |  |
Total Private Education Loans, gross | 772,086 |  |  | 1,049,007 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2020 | 0 |  |  |  |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2019 | 253 |  |  | 380 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2018 | 49 |  |  | 133 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2017 | 0 |  |  | 0 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2016 | 0 |  |  | 0 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Total | 302 |  |  | 513 |  |  |
Total Private Education Loans, 2020 | 39 |  |  |  |  |  |
Total Private Education Loans, 2019 | 327,328 |  |  | 405,156 |  |  |
Total Private Education Loans, 2018 | 385,021 |  |  | 540,917 |  |  |
Total Private Education Loans, 2017 | 59,362 |  |  | 102,464 |  |  |
Total Private Education Loans, 2016 | 638 |  |  | 983 |  |  |
Total Private Education Loans | 772,388 |  |  | 1,049,520 |  |  |
Private Education Loans allowance for losses, 2020 | (7) |  |  |  |  |  |
Private Education Loans allowance for losses, 2019 | (59,623) |  |  | (21,589) |  |  |
Private Education Loans allowance for losses, 2018 | (92,209) |  |  | (37,492) |  |  |
Private Education Loans allowance for losses, 2017 | (11,419) |  |  | (6,722) |  |  |
Private Education Loans allowance for losses, 2016 | (79) |  |  | (74) |  |  |
Private Education Loans allowance for losses | (163,337) |  |  | (65,877) |  |  |
Private Education Loans, net, 2020 | 32 |  |  |  |  |  |
Private Education Loans, net, 2019 | 267,705 |  |  | 383,567 |  |  |
Private Education Loans, net, 2018 | 292,812 |  |  | 503,425 |  |  |
Private Education Loans, net, 2017 | 47,943 |  |  | 95,742 |  |  |
Private Education Loans, net, 2016 | 559 |  |  | 909 |  |  |
Loans held for investment, net | $ 609,051 |  |  | $ 983,643 |  |  |
Percentage of Private Education Loans in repayment, 2020 | 0.00% |  |  |  |  |  |
Percentage of Private Education Loans in repayment, 2019 | 1.30% |  |  | 1.10% |  |  |
Percentage of Private Education Loans in repayment, 2018 | 2.20% |  |  | 3.30% |  |  |
Percentage of Private Education Loans in repayment, 2017 | 1.60% |  |  | 2.80% |  |  |
Percentage of Private Education Loans in repayment, 2016 | 0.00% |  |  | 4.20% |  |  |
Percentage of Private Education Loans in repayment | 1.80% |  |  | 2.40% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2020 | 0.00% |  |  |  |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2019 | 1.20% |  |  |  |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2018 | 2.10% |  |  |  |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2017 | 1.60% |  |  |  |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2016 | 0.00% |  |  |  |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment | 1.70% |  |  |  |  |  |
Personal Loans | Consumer Portfolio Segment | Loan delinquency 31-60 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 813 |  |  | $ 2,164 |  |  |
2018 | 1,821 |  |  | 6,213 |  |  |
2017 | 175 |  |  | 1,045 |  |  |
2016 | 0 |  |  | 13 |  |  |
Total | $ 2,809 |  |  | $ 9,435 |  |  |
Loans delinquent | 0.40% |  |  | 0.90% |  |  |
Personal Loans | Consumer Portfolio Segment | Loan delinquency 61-90 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 1,177 |  |  | $ 1,074 |  |  |
2018 | 2,589 |  |  | 5,148 |  |  |
2017 | 343 |  |  | 943 |  |  |
2016 | 0 |  |  | 7 |  |  |
Total | $ 4,109 |  |  | $ 7,172 |  |  |
Loans delinquent | 0.60% |  |  | 0.70% |  |  |
Personal Loans | Consumer Portfolio Segment | Loan delinquency greater than 90 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 1,725 |  |  | $ 1,322 |  |  |
2018 | 3,192 |  |  | 6,645 |  |  |
2017 | 383 |  |  | 895 |  |  |
2016 | 0 |  |  | 21 |  |  |
Total | $ 5,300 |  |  | $ 8,883 |  |  |
Loans delinquent | 0.70% |  |  | 0.80% |  |  |
Personal Loans | Loans In Forbearance | Consumer Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 17,037 |  |  | $ 0 |  |  |
2018 | 23,214 |  |  | 0 |  |  |
2017 | 3,646 |  |  | 0 |  |  |
2016 | 25 |  |  | 0 |  |  |
Total | 43,922 |  |  | 0 |  |  |
2020 | 0 |  |  |  |  |  |
2019 | 17,498 |  |  |  |  |  |
2018 | 23,703 |  |  |  |  |  |
2017 | 3,646 |  |  |  |  |  |
2016 | 25 |  |  |  |  |  |
Total | $ 44,872 |  |  |  |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, current | 97.90% |  |  |  |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 100.00% |  |  |  |  |  |
Personal Loans | Loans In Forbearance | Consumer Portfolio Segment | Loan delinquency 31-60 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 23 |  |  |  |  |  |
2018 | 70 |  |  |  |  |  |
2017 | 0 |  |  |  |  |  |
2016 | 0 |  |  |  |  |  |
Total | $ 93 |  |  |  |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 0.20% |  |  |  |  |  |
Personal Loans | Loans In Forbearance | Consumer Portfolio Segment | Loan delinquency 61-90 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 258 |  |  |  |  |  |
2018 | 130 |  |  |  |  |  |
2017 | 0 |  |  |  |  |  |
2016 | 0 |  |  |  |  |  |
Total | $ 388 |  |  |  |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 0.90% |  |  |  |  |  |
Personal Loans | Loans In Forbearance | Consumer Portfolio Segment | Loan delinquency greater than 90 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 0 |  |  |  |  |  |
2019 | 180 |  |  |  |  |  |
2018 | 289 |  |  |  |  |  |
2017 | 0 |  |  |  |  |  |
2016 | 0 |  |  |  |  |  |
Total | $ 469 |  |  |  |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 1.00% |  |  |  |  |  |
Student Loan | Consumer Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | $ 664,058 |  |  |  |  |  |
2019 | 3,004,489 |  |  | 2,340,221 |  |  |
2018 | 2,346,348 |  |  | 3,159,878 |  |  |
2017 | 2,076,951 |  |  | 2,781,132 |  |  |
2016 | 1,907,320 |  |  | 2,566,815 |  |  |
2015 and Prior | 4,191,163 |  |  | 2,225,721 |  |  |
2014 and Prior |  |  |  | 3,241,884 |  |  |
Total | 14,190,329 |  |  | 16,315,651 |  |  |
Total Private Education Loans in repayment, 2020 | 666,681 |  |  | 2,355,395 |  |  |
Total Private Education Loans in repayment, 2019 | 3,021,124 |  |  | 3,199,351 |  |  |
Total Private Education Loans in repayment, 2018 | 2,383,327 |  |  | 2,850,380 |  |  |
Total Private Education Loans in repayment, 2017 | 2,129,485 |  |  | 2,651,946 |  |  |
Total Private Education Loans in repayment, 2016 | 1,964,849 |  |  | 2,317,788 |  |  |
Total Private Education Loans in repayment, 2015 and prior | 4,347,257 |  |  | 3,412,810 |  |  |
Total Private Education Loans in repayment | 14,512,723 |  |  | 16,787,670 |  |  |
Total Private Education Loans, gross, 2020 | 1,216,840 |  |  | 4,047,048 |  |  |
Total Private Education Loans, gross, 2019 | 5,185,153 |  |  | 4,888,373 |  |  |
Total Private Education Loans, gross, 2018 | 3,714,606 |  |  | 4,003,485 |  |  |
Total Private Education Loans, gross, 2017 | 3,131,477 |  |  | 3,433,858 |  |  |
Total Private Education Loans, gross, 2016 | 2,692,924 |  |  | 2,821,172 |  |  |
Total Private Education Loans, gross, 2015 and prior | 5,544,465 |  |  | 3,995,655 |  |  |
Total Private Education Loans, gross | 21,485,465 |  |  | 23,189,591 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2020 | 10,625 |  |  | 23,661 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2019 | 19,555 |  |  | 17,699 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2018 | 11,819 |  |  | 13,843 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2017 | 8,911 |  |  | 12,304 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2016 | 7,454 |  |  | 8,564 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2015 | 9,245 |  |  | 5,153 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Total | 67,609 |  |  | 81,224 |  |  |
Total Private Education Loans, 2020 | 1,227,465 |  |  | 4,070,709 |  |  |
Total Private Education Loans, 2019 | 5,204,708 |  |  | 4,906,072 |  |  |
Total Private Education Loans, 2018 | 3,726,425 |  |  | 4,017,328 |  |  |
Total Private Education Loans, 2017 | 3,140,388 |  |  | 3,446,162 |  |  |
Total Private Education Loans, 2016 | 2,700,378 |  |  | 2,829,736 |  |  |
Total Private Education Loans, 2015 and Prior | 5,553,710 |  |  | 4,000,808 |  |  |
Total Private Education Loans | 21,553,074 |  |  | 23,270,815 |  |  |
Private Education Loans allowance for losses, 2020 | (149,416) |  |  | (3,013) |  |  |
Private Education Loans allowance for losses, 2019 | (408,844) |  |  | (19,105) |  |  |
Private Education Loans allowance for losses, 2018 | (305,239) |  |  | (44,858) |  |  |
Private Education Loans allowance for losses, 2017 | (260,677) |  |  | (71,598) |  |  |
Private Education Loans allowance for losses, 2016 | (217,161) |  |  | (80,974) |  |  |
Private Education Loans allowance for losses, 2015 and prior | (419,222) |  |  | (154,752) |  |  |
Private Education Loans allowance for losses | (1,760,559) |  |  | (374,300) |  |  |
Private Education Loans, net, 2020 | 1,078,049 |  |  | 4,067,696 |  |  |
Private Education Loans, net, 2019 | 4,795,864 |  |  | 4,886,967 |  |  |
Private Education Loans, net, 2018 | 3,421,186 |  |  | 3,972,470 |  |  |
Private Education Loans, net, 2017 | 2,879,711 |  |  | 3,374,564 |  |  |
Private Education Loans, net, 2016 | 2,483,217 |  |  | 2,748,762 |  |  |
Private Education Loans, net, 2015 and prior | 5,134,488 |  |  | 3,846,056 |  |  |
Loans held for investment, net | 19,792,515 |  |  | 22,896,515 |  |  |
Student Loan | Consumer Portfolio Segment | Loan delinquency 31-60 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 1,914 |  |  |  |  |  |
2019 | 10,970 |  |  | 11,152 |  |  |
2018 | 19,053 |  |  | 26,096 |  |  |
2017 | 26,884 |  |  | 44,382 |  |  |
2016 | 28,314 |  |  | 51,656 |  |  |
2015 and Prior | 79,449 |  |  | 54,559 |  |  |
2014 and Prior |  |  |  | 100,206 |  |  |
Total | 166,584 |  |  | 288,051 |  |  |
Student Loan | Consumer Portfolio Segment | Loan delinquency 61-90 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 448 |  |  |  |  |  |
2019 | 4,064 |  |  | 3,087 |  |  |
2018 | 11,536 |  |  | 9,527 |  |  |
2017 | 17,106 |  |  | 17,048 |  |  |
2016 | 19,241 |  |  | 21,161 |  |  |
2015 and Prior | 47,258 |  |  | 24,562 |  |  |
2014 and Prior |  |  |  | 45,917 |  |  |
Total | 99,653 |  |  | 121,302 |  |  |
Student Loan | Consumer Portfolio Segment | Loan delinquency greater than 90 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 261 |  |  |  |  |  |
2019 | 1,601 |  |  | 935 |  |  |
2018 | 6,390 |  |  | 3,850 |  |  |
2017 | 8,544 |  |  | 7,818 |  |  |
2016 | 9,974 |  |  | 12,314 |  |  |
2015 and Prior | 29,387 |  |  | 12,946 |  |  |
2014 and Prior |  |  |  | 24,803 |  |  |
Total | 56,157 |  |  | 62,666 |  |  |
Student Loan | Loans In-School/Grace/Deferment | Consumer Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 532,190 |  |  |  |  |  |
2019 | 2,038,059 |  |  | 1,670,644 |  |  |
2018 | 1,100,549 |  |  | 1,580,513 |  |  |
2017 | 740,554 |  |  | 1,010,764 |  |  |
2016 | 465,662 |  |  | 635,798 |  |  |
2015 and Prior | 603,033 |  |  | 375,585 |  |  |
2014 and Prior |  |  |  | 414,101 |  |  |
Total | 5,480,047 |  |  | 5,687,405 |  |  |
Student Loan | Loans In Forbearance | Consumer Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 17,801 |  |  |  |  |  |
2019 | 123,106 |  |  | 21,009 |  |  |
2018 | 222,065 |  |  | 108,509 |  |  |
2017 | 248,986 |  |  | 142,341 |  |  |
2016 | 248,467 |  |  | 146,114 |  |  |
2015 and Prior | 560,160 |  |  | 127,799 |  |  |
2014 and Prior |  |  |  | 168,744 |  |  |
Total | 1,420,585 |  |  | 714,516 |  |  |
2020 | 17,969 |  |  |  |  |  |
2019 | 125,970 |  |  |  |  |  |
2018 | 230,730 |  |  |  |  |  |
2017 | 261,438 |  |  |  |  |  |
2016 | 262,413 |  |  |  |  |  |
2015 and Prior | 594,175 |  |  |  |  |  |
Total | 1,492,695 |  |  |  |  |  |
Total Private Education Loans in repayment, 2020 |  |  |  | 21,009 |  |  |
Total Private Education Loans in repayment, 2019 |  |  |  | 108,509 |  |  |
Total Private Education Loans in repayment, 2018 |  |  |  | 142,341 |  |  |
Total Private Education Loans in repayment, 2017 |  |  |  | 146,114 |  |  |
Total Private Education Loans in repayment, 2016 |  |  |  | 127,799 |  |  |
Total Private Education Loans in repayment, 2015 and prior |  |  |  | 168,744 |  |  |
Total Private Education Loans in repayment |  |  |  | 714,516 |  |  |
Student Loan | Loans In Forbearance | Consumer Portfolio Segment | Loan delinquency 31-60 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 112 |  |  |  |  |  |
2019 | 1,979 |  |  | 0 |  |  |
2018 | 4,996 |  |  | 0 |  |  |
2017 | 6,642 |  |  | 0 |  |  |
2016 | 7,988 |  |  | 0 |  |  |
2015 and Prior | 18,738 |  |  | 0 |  |  |
2014 and Prior |  |  |  | 0 |  |  |
Total | 40,455 |  |  | 0 |  |  |
Student Loan | Loans In Forbearance | Consumer Portfolio Segment | Loan delinquency 61-90 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 56 |  |  |  |  |  |
2019 | 521 |  |  | 0 |  |  |
2018 | 2,503 |  |  | 0 |  |  |
2017 | 3,859 |  |  | 0 |  |  |
2016 | 4,093 |  |  | 0 |  |  |
2015 and Prior | 10,254 |  |  | 0 |  |  |
2014 and Prior |  |  |  | 0 |  |  |
Total | 21,286 |  |  | 0 |  |  |
Student Loan | Loans In Forbearance | Consumer Portfolio Segment | Loan delinquency greater than 90 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
2020 | 0 |  |  |  |  |  |
2019 | 364 |  |  | 0 |  |  |
2018 | 1,166 |  |  | 0 |  |  |
2017 | 1,951 |  |  | 0 |  |  |
2016 | 1,865 |  |  | 0 |  |  |
2015 and Prior | 5,023 |  |  | 0 |  |  |
2014 and Prior |  |  |  | 0 |  |  |
Total | $ 10,369 |  |  | $ 0 |  |  |

X
- Definition Delinquencies as a percentage of loans in repayment. + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepayment
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment And Delinquent Forbearance Loans, Originated Five Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentAndDelinquentForbearanceLoansOriginatedFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment And Delinquent Forbearance Loans, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentAndDelinquentForbearanceLoansOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment And Delinquent Forbearance Loans, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentAndDelinquentForbearanceLoansOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment And Delinquent Forbearance Loans, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentAndDelinquentForbearanceLoansOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment And Delinquent Forbearance Loans, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentAndDelinquentForbearanceLoansOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment And Delinquent Forbearance Loans, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentAndDelinquentForbearanceLoansOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment, Originated Five Or More Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentOriginatedFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquencies As Percentage Of Loans In Repayment, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_DelinquenciesAsPercentageOfLoansInRepaymentOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Delinquent Forbearance Loans As Percentage Of Loans In Repayment + References No definition available. + Details
Name: | slm_DelinquentForbearanceLoansAsPercentageOfLoansInRepayment
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

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

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

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

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

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

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

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

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

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

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

X
- Definition Financing Receivable, Loans In Forbearance, before Allowance for Credit Loss + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Loans In Forbearance, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Loans In Forbearance, Year Five, Originated, Four Years before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Loans In Forbearance, Year Four, Originated, Three Years before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Loans In Forbearance, Year Six, Originated, More Than Five Years before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceYearSixOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Loans In Forbearance, Year Three, Originated, Two Years before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Loans In Forbearance, Year Two, Originated, Fiscal Year before Current Fiscal Year + References No definition available. + Details
Name: | slm_FinancingReceivableLoansInForbearanceYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Loans, Before Allowance For Credit Loss + References No definition available. + Details
Name: | slm_LoansBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Before Allowance For Credit Loss + References No definition available. + Details
Name: | slm_LoansGrossBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Originated Five Or More Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansGrossOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Originated Four Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansGrossOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansGrossOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansGrossOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Originated Three Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansGrossOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Gross, Originated Two Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansGrossOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearance
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance, Current + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearanceCurrent
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance, Originated Five Or More Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearanceOriginatedFiveOrMoreYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearanceOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearanceOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearanceOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInForbearanceAsAPercentageOfPrivateEducationLoansInRepaymentAndForbearanceOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in forbearance as a percentage of loans in repayment and forbearance. + References No definition available. + Details
Name: | slm_LoansInForbearanceAsPercentageOfLoansInRepaymentAndForbearance
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans In Repayment, Before Allowance For Credit Loss + References No definition available. + Details
Name: | slm_LoansInRepaymentBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans in repayment current in percentage. + References No definition available. + Details
Name: | slm_LoansInRepaymentCurrentInPercentage
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total loans in repayment, in percentage. + References No definition available. + Details
Name: | slm_LoansInRepaymentInPercentage
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans In Repayment, Originated Five Or More Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInRepaymentOriginatedFiveOrMoreYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans In Repayment, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInRepaymentOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total loans in repayment. + References No definition available. + Details
Name: | slm_LoansInRepaymentOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans In Repayment, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansInRepaymentOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans In Repayment, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInRepaymentOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans In Repayment, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansInRepaymentOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Originated Five Or More Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Originated Four Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Originated Three Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_LoansOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_LoansOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Before Allowance For Credit Loss + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Originated Five Or More Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Originated Four Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Originated Three Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Unamortized Premium Or Discount, Originated Two Years Before Current Fiscal Year + References No definition available. + Details
Name: | slm_NetUnamortizedPremiumOrDiscountOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Before Allowance For Credit Loss + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentBeforeAllowanceForCreditLoss
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Originated Five Or More Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Originated Four Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Originated In Current Fiscal Year + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentOriginatedInCurrentFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Originated In Fiscal Year Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Originated Three Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loans In Repayment, Originated Two Years Before Latest Fiscal Year + References No definition available. + Details
Name: | slm_PercentageOfLoansInRepaymentOriginatedTwoYearsBeforeLatestFiscalYear
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 of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 Percentage of financing receivable balance that is past due. + References No definition available. + Details
Name: | us-gaap_FinancingReceivablePercentPastDue1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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
- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: 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 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=slm_FinancingReceivables31to60DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=slm_FinancingReceivables61to90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=slm_FinancingReceivablesGreaterThan90DaysPastDueMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_StudentLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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