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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 17,432,167 | $ 14,251,675
Consumer Portfolio Segment | Student Loan | With cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 15,658,539 | $ 12,816,512
Private Education Loans with cosigner in percent | 90.00% | 90.00%
Consumer Portfolio Segment | Student Loan | Without cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,773,628 | $ 1,435,163
Private Education Loans without cosigner in percent | 10.00% | 10.00%
Consumer Portfolio Segment | Student Loan | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 17,432,167 | $ 14,251,675
Total in percent | 100.00% | 100.00%
Consumer Portfolio Segment | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 17,432,167 | $ 14,251,675
Total in percent | 100.00% | 100.00%
Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 17,432,167 | $ 14,251,675
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 24.00% | 26.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 19.00% | 20.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 14.00% | 13.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 9.00% | 7.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 7.00% | 5.00%
Seasoning - based on monthly scheduled payments due from not yet in repayment, in percent | 27.00% | 29.00%
Consumer Portfolio Segment | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 400,280 | $ 12,894
Total in percent | 100.00% | 100.00%
Consumer Portfolio Segment | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 400,280 | $ 12,894
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 0.00% | 0.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 0.00% | 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%
FICO score less than 670 | Consumer Portfolio Segment | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,153,591 | $ 920,132
Private Education Loans at origination | 6.00% | 6.00%
FICO score less than 670 | Consumer Portfolio Segment | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 32,156 | $ 1,189
Private Education Loans at origination | 8.00% | 9.00%
FICO score 670-699 | Consumer Portfolio Segment | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,596,959 | $ 2,092,722
Private Education Loans at origination | 15.00% | 15.00%
FICO score 670-699 | Consumer Portfolio Segment | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 114,731 | $ 3,139
Private Education Loans at origination | 29.00% | 24.00%
FICO score 700-749 | Consumer Portfolio Segment | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 5,714,554 | $ 4,639,958
Private Education Loans at origination | 33.00% | 33.00%
FICO score 700-749 | Consumer Portfolio Segment | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 182,025 | $ 5,678
Private Education Loans at origination | 45.00% | 44.00%
FICO score greater than 750 | Consumer Portfolio Segment | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 7,967,063 | $ 6,598,863
Private Education Loans at origination | 46.00% | 46.00%
FICO score greater than 750 | Consumer Portfolio Segment | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 71,368 | $ 2,888
Private Education Loans at origination | 18.00% | 23.00%
1-12 payments | Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 4,256,592 | $ 3,737,110
1-12 payments | Consumer Portfolio Segment | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 400,280 | 12,894
13-24 payments | Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 3,229,465 | 2,841,107
13-24 payments | Consumer Portfolio Segment | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
25-36 payments | Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,429,238 | 1,839,764
25-36 payments | Consumer Portfolio Segment | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
37-48 payments | Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 1,502,327 | 917,633
37-48 payments | Consumer Portfolio Segment | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
More than 48 payments | Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 1,256,813 | 726,106
More than 48 payments | Consumer Portfolio Segment | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
Not yet in repayment | Consumer Portfolio Segment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 4,757,732 | $ 4,189,955

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