XML 169 R62.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Allowance for Loan Losses - Age Analysis of Past Due Loan Delinquencies (Details) - Student Loan - Consumer Portfolio Segment - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans in in-school/grace/deferment | $ 5,687,405 | $ 5,260,445 | $ 4,757,732
Loans in forbearance | 714,516 | 577,164 | 468,402
TDR loans in repayment and percentage of each status: |  |  |
Loans current | 16,315,651 | 14,289,705 | 11,911,128
Total TDR loans in repayment | $ 16,787,670 | $ 14,666,856 | $ 12,206,033
Loans current, in percentage | 97.20% | 97.40% | 97.60%
Loans in repayment, in percentage | 100.00% | 100.00% | 100.00%
Total TDR loans, gross | $ 23,189,591 | $ 20,504,465 | $ 17,432,167
Loans delinquent 31-60 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 288,051 | $ 231,216 | $ 179,002
Loans delinquent (in percentage) | 1.70% | 1.60% | 1.50%
Loans delinquent 61-90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 121,302 | $ 95,105 | $ 78,292
Loans delinquent (in percentage) | 0.70% | 0.70% | 0.60%
Loans delinquent greater than 90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 62,666 | $ 50,830 | $ 37,611
Loans delinquent (in percentage) | 0.40% | 0.30% | 0.30%
Troubled Debt Restructured Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans in in-school/grace/deferment | $ 87,749 | $ 69,212 |
Loans in forbearance | 99,054 | 69,796 |
TDR loans in repayment and percentage of each status: |  |  |
Loans current | 1,230,954 | 994,411 |
Total TDR loans in repayment | $ 1,395,163 | $ 1,118,848 |
Loans current, in percentage | 88.20% | 88.90% |
Loans in repayment, in percentage | 100.00% | 100.00% |
Total TDR loans, gross | $ 1,581,966 | $ 1,257,856 |
Troubled Debt Restructured Loans | Loans delinquent 31-60 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 85,555 | $ 63,074 |
Loans delinquent (in percentage) | 6.10% | 5.60% |
Troubled Debt Restructured Loans | Loans delinquent 61-90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 49,626 | $ 36,804 |
Loans delinquent (in percentage) | 3.60% | 3.30% |
Troubled Debt Restructured Loans | Loans delinquent greater than 90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 29,028 | $ 24,559 |
Loans delinquent (in percentage) | 2.10% | 2.20% |

X
- Definition Loan status forbearance recorded investment. + References No definition available. + Details
Name: | slm_LoanStatusForbearanceRecordedInvestment
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loan status in school grace and deferment recorded investment. + References No definition available. + Details
Name: | slm_LoanStatusInSchoolGraceAndDefermentRecordedInvestment
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total loans, gross + References No definition available. + Details
Name: | slm_LoansGross
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_LoansInRepayment
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans in repayment and percentage of each status. + References No definition available. + Details
Name: | slm_LoansInRepaymentAndPercentageOfEachStatusAbstract
Namespace Prefix: | slm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 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 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 of financing receivable not past due. + References Reference 1: 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=118955255&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable past due. + References Reference 1: 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=118955255&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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