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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 13,848,262 | $ 10,596,437
Private Education Loans | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans with cosigner | 12,456,310 | 9,515,136
Private Education Loans without cosigner | 1,391,952 | 1,081,301
Total | $ 13,848,262 | $ 10,596,437
Private Education Loans with cosigner in percent | 90.00% | 90.00%
Private Education Loans without cosigner in percent | 10.00% | 10.00%
Total in percent | 100.00% | 100.00%
Private Education Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 13,848,262 | $ 10,596,437
Total in percent | 100.00% | 100.00%
Private Education Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 13,848,262 | $ 10,596,437
Total in percent | 100.00% | 100.00%
Seasoning - based on monthly scheduled payments due from 1-12 payments | $ 4,307,106 | $ 3,059,901
Seasoning - based on monthly scheduled payments due from 13-24 payments | 2,398,396 | 2,096,412
Seasoning - based on monthly scheduled payments due from 25-36 payments | 1,357,242 | 1,084,818
Seasoning - based on monthly scheduled payments due from 37-48 payments | 630,420 | 513,125
Seasoning - based on monthly scheduled payments due from more than 48 payments | 492,157 | 414,217
Seasoning - based on monthly scheduled payments due from not yet in repayment | $ 4,662,941 | $ 3,427,964
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 31.00% | 29.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 17.00% | 20.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 10.00% | 10.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 4.00% | 5.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 4.00% | 4.00%
Seasoning - based on monthly scheduled payments due from not yet in repayment, in percent | 34.00% | 32.00%
FICO score less than 670 | Private Education Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 889,151 | $ 700,779
Total in percent | 6.00% | 7.00%
FICO score 670-699 | Private Education Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 2,025,444 | $ 1,554,959
Total in percent | 15.00% | 15.00%
FICO score 700-749 | Private Education Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 4,492,235 | $ 3,403,823
Total in percent | 32.00% | 32.00%
FICO score greater than or equal to 750 | Private Education Loans | FICO at Original Approval |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 6,441,432 | $ 4,936,876
Total in percent | 47.00% | 46.00%

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