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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - Consumer Portfolio Segment - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
With cosigner | Student Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 20,709,636 | $ 18,378,398
Private Education Loans with cosigner in percent | 89.00% | 90.00%
Without cosigner | Student Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,479,955 | $ 2,126,067
Private Education Loans without cosigner in percent | 11.00% | 10.00%
Cosigners | Student Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,189,591 | $ 20,504,465
Total in percent | 100.00% | 100.00%
School Type/FICO Scores | Student Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,189,591 | $ 20,504,465
Total in percent | 100.00% | 100.00%
School Type/FICO Scores | Student Loan | FICO score less than 670 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,665,589 | $ 1,409,789
Private Education Loans at origination | 7.00% | 7.00%
School Type/FICO Scores | Student Loan | FICO score 670-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 3,570,025 | $ 3,106,983
Private Education Loans at origination | 16.00% | 15.00%
School Type/FICO Scores | Student Loan | FICO score 700-749 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 7,670,748 | $ 6,759,721
Private Education Loans at origination | 33.00% | 33.00%
School Type/FICO Scores | Student Loan | FICO score greater than 750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 10,283,229 | $ 9,227,972
Private Education Loans at origination | 44.00% | 45.00%
School Type/FICO Scores | Personal Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,049,007 | $ 1,190,091
Total in percent | 100.00% | 100.00%
School Type/FICO Scores | Personal Loans | FICO score less than 670 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 47,367 | $ 77,702
Private Education Loans at origination | 4.00% | 7.00%
School Type/FICO Scores | Personal Loans | FICO score 670-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 259,098 | $ 339,053
Private Education Loans at origination | 25.00% | 28.00%
School Type/FICO Scores | Personal Loans | FICO score 700-749 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 521,856 | $ 554,700
Private Education Loans at origination | 50.00% | 47.00%
School Type/FICO Scores | Personal Loans | FICO score greater than 750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 220,686 | $ 218,636
Private Education Loans at origination | 21.00% | 18.00%
School FICO, Refreshed Amounts | Student Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,189,591 | $ 20,504,465
Total in percent | 100.00% | 100.00%
School FICO, Refreshed Amounts | Student Loan | FICO score less than 670 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,979,437 | $ 2,416,979
Private Education Loans at origination | 13.00% | 12.00%
School FICO, Refreshed Amounts | Student Loan | FICO score 670-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,883,122 | $ 2,504,467
Private Education Loans at origination | 13.00% | 12.00%
School FICO, Refreshed Amounts | Student Loan | FICO score 700-749 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 6,806,602 | $ 6,144,489
Private Education Loans at origination | 29.00% | 30.00%
School FICO, Refreshed Amounts | Student Loan | FICO score greater than 750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 10,520,430 | $ 9,438,530
Private Education Loans at origination | 45.00% | 46.00%
Seasoning | Student Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,189,591 | $ 20,504,465
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 23.00% | 24.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 17.00% | 17.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 12.00% | 13.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 10.00% | 10.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 13.00% | 10.00%
Seasoning - based on monthly scheduled payments due from not yet in repayment, in percent | 25.00% | 26.00%
Seasoning | Student Loan | 1-12 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 5,351,702 | $ 4,969,334
Seasoning | Student Loan | 13-24 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 4,004,151 | 3,481,235
Seasoning | Student Loan | 25-36 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,902,365 | 2,741,954
Seasoning | Student Loan | 37-48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,213,944 | 1,990,049
Seasoning | Student Loan | More than 48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 3,030,024 | 2,061,448
Seasoning | Student Loan | Not yet in repayment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 5,687,405 | 5,260,445
Seasoning | Personal Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,049,007 | $ 1,190,091
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 45.00% | 85.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 48.00% | 15.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 7.00% | 0.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 0.00% | 0.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 0.00% | 0.00%
Seasoning | Personal Loans | 1-12 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 469,940 | $ 1,008,758
Seasoning | Personal Loans | 13-24 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 505,318 | 181,333
Seasoning | Personal Loans | 25-36 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 73,749 | 0
Seasoning | Personal Loans | 37-48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
Seasoning | Personal Loans | More than 48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 0 | $ 0

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