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Allowance for Loan Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - Consumer Portfolio Segment - Student Loan - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,120,169 | $ 20,504,465
Total in percent | 100.00% | 100.00%
School FICO, Refreshed Amounts | Less than 670 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,819,600 | $ 2,416,979
Private Education Loans At Origination | 12.00% | 12.00%
School FICO, Refreshed Amounts | 670-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,843,463 | $ 2,504,467
Private Education Loans At Origination | 12.00% | 12.00%
School FICO, Refreshed Amounts | 700-749 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 6,830,464 | $ 6,144,489
Private Education Loans At Origination | 30.00% | 30.00%
School FICO, Refreshed Amounts | Greater than or equal to 750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 10,626,642 | $ 9,438,530
Private Education Loans At Origination | 46.00% | 46.00%
Private Education Loans | With Cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 20,663,133 | $ 18,378,398
Private Education Loans with cosigner | 89.00% | 90.00%
Private Education Loans | Without Cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,457,036 | $ 2,126,067
Private Education Loans without cosigner | 11.00% | 10.00%
Private Education Loans | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,120,169 | $ 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 | $ 23,120,169 | $ 20,504,465
Total in percent | 100.00% | 100.00%
Private Education Loans | FICO at Original Approval | Less than 670 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,635,201 | $ 1,409,789
Private Education Loans At Origination | 7.00% | 7.00%
Private Education Loans | FICO at Original Approval | 670-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 3,528,152 | $ 3,106,983
Private Education Loans At Origination | 15.00% | 15.00%
Private Education Loans | FICO at Original Approval | 700-749 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 7,632,035 | $ 6,759,721
Private Education Loans At Origination | 33.00% | 33.00%
Private Education Loans | FICO at Original Approval | Greater than or equal to 750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 10,324,781 | $ 9,227,972
Private Education Loans At Origination | 45.00% | 45.00%
Private Education Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 23,120,169 | $ 20,504,465
Total in percent | 100.00% | 100.00%
Private Education Loans | Seasoning | 1-12 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 5,970,773 | $ 4,969,334
Seasoning based on monthly scheduled payments due from 1-12 payments | 26.00% | 24.00%
Private Education Loans | Seasoning | 13-24 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 3,652,078 | $ 3,481,235
Seasoning based on monthly scheduled payments due from 13 - 24 payments | 16.00% | 17.00%
Private Education Loans | Seasoning | 25-36 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,684,175 | $ 2,741,954
Seasoning based on monthly scheduled payments due from 25 - 36 payments | 11.00% | 13.00%
Private Education Loans | Seasoning | 37-48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,031,488 | $ 1,990,049
Seasoning based on monthly scheduled payments due from 37 - 48 payments | 9.00% | 10.00%
Private Education Loans | Seasoning | More than 48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,337,745 | $ 2,061,448
Seasoning based on monthly scheduled payments due from more than 48 payments | 10.00% | 10.00%
Private Education Loans | Seasoning | Not yet in repayment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 6,443,910 | $ 5,260,445
Seasoning based on monthly scheduled payments due from not yet in repayment | 28.00% | 26.00%
Personal Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,131,833 | $ 1,190,091
Total in percent | 100.00% | 100.00%
Personal Loans | FICO at Original Approval | Less than 670 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 55,467 | $ 77,702
Private Education Loans At Origination | 5.00% | 7.00%
Personal Loans | FICO at Original Approval | 670-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 286,460 | $ 339,053
Private Education Loans At Origination | 25.00% | 28.00%
Personal Loans | FICO at Original Approval | 700-749 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 557,828 | $ 554,700
Private Education Loans At Origination | 49.00% | 47.00%
Personal Loans | FICO at Original Approval | Greater than or equal to 750 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 232,078 | $ 218,636
Private Education Loans At Origination | 21.00% | 18.00%
Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,131,833 | $ 1,190,091
Seasoning based on monthly scheduled payments due from 1-12 payments | 50.00% | 85.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments | 49.00% | 15.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments | 1.00% | 0.00%
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%
Personal Loans | Seasoning | 1-12 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 561,102 | $ 1,008,758
Personal Loans | Seasoning | 13-24 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 552,313 | 181,333
Personal Loans | Seasoning | 25-36 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 18,418 | 0
Personal Loans | Seasoning | 37-48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
Personal Loans | Seasoning | More than 48 payments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 0 | $ 0

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