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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, 2018 | Dec. 31, 2017
--- | --- | ---
Student Loan | With cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 18,378,398 | $ 15,658,539
Private Education Loans with cosigner in percent | 90.00% | 90.00%
Student Loan | Without cosigner |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,126,067 | $ 1,773,628
Private Education Loans without cosigner in percent | 10.00% | 10.00%
Student Loan | Cosigners |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 20,504,465 | $ 17,432,167
Total in percent | 100.00% | 100.00%
Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 20,504,465 | $ 17,432,167
Total in percent | 100.00% | 100.00%
Student Loan | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 20,504,465 | $ 17,432,167
Total in percent | 100.00% | 100.00%
Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 20,504,465 | $ 17,432,167
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 24.00% | 24.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 17.00% | 19.00%
Seasoning based on monthly scheduled payments due from 25 - 36 payments, in percent | 13.00% | 14.00%
Seasoning based on monthly scheduled payments due from 37 - 48 payments, in percent | 10.00% | 9.00%
Seasoning based on monthly scheduled payments due from more than 48 payments, in percent | 10.00% | 7.00%
Seasoning - based on monthly scheduled payments due from not yet in repayment, in percent | 26.00% | 27.00%
Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,190,091 | $ 400,280
Total in percent | 100.00% | 100.00%
Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,190,091 | $ 400,280
Total in percent | 100.00% | 100.00%
Seasoning based on monthly scheduled payments due from 1-12 payments, in percent | 85.00% | 100.00%
Seasoning based on monthly scheduled payments due from 13 - 24 payments, in percent | 15.00% | 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 | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 1,409,789 | $ 1,153,591
Private Education Loans at origination | 7.00% | 6.00%
FICO score less than 670 | Student Loan | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,416,979 | $ 1,964,962
Private Education Loans at origination | 12.00% | 11.00%
FICO score less than 670 | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 77,702 | $ 32,156
Private Education Loans at origination | 7.00% | 8.00%
FICO score 670-699 | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 3,106,983 | $ 2,596,959
Private Education Loans at origination | 15.00% | 15.00%
FICO score 670-699 | Student Loan | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 2,504,467 | $ 2,138,379
Private Education Loans at origination | 12.00% | 12.00%
FICO score 670-699 | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 339,053 | $ 114,731
Private Education Loans at origination | 28.00% | 29.00%
FICO score 700-749 | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 6,759,721 | $ 5,714,554
Private Education Loans at origination | 33.00% | 33.00%
FICO score 700-749 | Student Loan | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 6,144,489 | $ 5,220,245
Private Education Loans at origination | 30.00% | 30.00%
FICO score 700-749 | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 554,700 | $ 182,025
Private Education Loans at origination | 47.00% | 45.00%
FICO score greater than 750 | Student Loan | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 9,227,972 | $ 7,967,063
Private Education Loans at origination | 45.00% | 46.00%
FICO score greater than 750 | Student Loan | School FICO, Refreshed Amounts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 9,438,530 | $ 8,108,581
Private Education Loans at origination | 46.00% | 47.00%
FICO score greater than 750 | Personal Loans | School Type/FICO Scores |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 218,636 | $ 71,368
Private Education Loans at origination | 18.00% | 18.00%
1-12 payments | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 4,969,334 | $ 4,256,592
1-12 payments | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 1,008,758 | 400,280
13-24 payments | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 3,481,235 | 3,229,465
13-24 payments | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 181,333 | 0
25-36 payments | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,741,954 | 2,429,238
25-36 payments | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
37-48 payments | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 1,990,049 | 1,502,327
37-48 payments | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
More than 48 payments | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 2,061,448 | 1,256,813
More than 48 payments | Personal Loans | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | 0 | 0
Not yet in repayment | Student Loan | Seasoning |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Private Education Loans | $ 5,260,445 | $ 4,757,732

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