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Allowance for Loan Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - Consumer Portfolio Segment - Student Loan - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 21,791,622 | $ 20,504,465
Total in percent | 100.00% | 100.00%
FICO score less than 670 | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,720,777 | $ 2,416,979
Private Education Loans At Origination | 12.00% | 12.00%
FICO score 670-699 | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,721,243 | $ 2,504,467
Private Education Loans At Origination | 13.00% | 12.00%
FICO score 700-749 | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 6,462,874 | $ 6,144,489
Private Education Loans At Origination | 30.00% | 30.00%
FICO score greater than or equal to 750 | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 9,886,728 | $ 9,438,530
Private Education Loans At Origination | 45.00% | 46.00%
Private Education Loans | With Cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 19,531,175 | $ 18,378,398
Private Education Loans with cosigner (in percentage) | 90.00% | 90.00%
Private Education Loans | Without Cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,260,447 | $ 2,126,067
Private Education Loans without cosigner (in percentage) | 10.00% | 10.00%
Private Education Loans | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 21,791,622 | $ 20,504,465
Total in percent | 100.00% | 100.00%
Private Education Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 21,791,622 | $ 20,504,465
Total in percent | 100.00% | 100.00%
Private Education Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 21,791,622 | $ 20,504,465
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments (in percentage) | 25.00% | 24.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments (in percentage) | 16.00% | 17.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments (in percentage) | 13.00% | 13.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments (in percentage) | 9.00% | 10.00%
Seasoning based on monthly scheduled payments due from more than 48 payments (in percentage) | 10.00% | 10.00%
Seasoning based on monthly scheduled payments due from not yet in repayment (in percentage) | 27.00% | 26.00%
Private Education Loans | FICO score less than 670 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,517,014 | $ 1,409,789
Private Education Loans At Origination | 7.00% | 7.00%
Private Education Loans | FICO score 670-699 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 3,306,017 | $ 3,106,983
Private Education Loans At Origination | 15.00% | 15.00%
Private Education Loans | FICO score 700-749 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 7,186,454 | $ 6,759,721
Private Education Loans At Origination | 33.00% | 33.00%
Private Education Loans | FICO score greater than or equal to 750 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 9,782,137 | $ 9,227,972
Private Education Loans At Origination | 45.00% | 45.00%
Private Education Loans | 1-12 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 5,451,167 | $ 4,969,334
Private Education Loans | 13-24 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 3,543,836 | 3,481,235
Private Education Loans | 25-36 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,729,369 | 2,741,954
Private Education Loans | 37-48 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,017,498 | 1,990,049
Private Education Loans | More than 48 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,178,899 | 2,061,448
Private Education Loans | Not yet in repayment | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 5,870,853 | 5,260,445
Personal Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,162,874 | $ 1,190,091
Total in percent | 100.00% | 100.00%
Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,162,874 | $ 1,190,091
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments (in percentage) | 72.00% | 85.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments (in percentage) | 27.00% | 15.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments (in percentage) | 1.00% | 0.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments (in percentage) | 0.00% | 0.00%
Seasoning based on monthly scheduled payments due from more than 48 payments (in percentage) | 0.00% | 0.00%
Personal Loans | FICO score less than 670 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 71,340 | $ 77,702
Private Education Loans At Origination | 6.00% | 7.00%
Personal Loans | FICO score 670-699 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 324,934 | $ 339,053
Private Education Loans At Origination | 28.00% | 28.00%
Personal Loans | FICO score 700-749 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 551,904 | $ 554,700
Private Education Loans At Origination | 47.00% | 47.00%
Personal Loans | FICO score greater than or equal to 750 | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 214,696 | $ 218,636
Private Education Loans At Origination | 19.00% | 18.00%
Personal Loans | 1-12 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 832,583 | $ 1,008,758
Personal Loans | 13-24 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 320,058 | 181,333
Personal Loans | 25-36 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 10,233 | 0
Personal Loans | 37-48 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
Personal Loans | More than 48 payments | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 0 | $ 0

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