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Loans - Loans by FICO Score, Consumer (Details) | Sep. 30, 2018 | Dec. 31, 2017
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Consumer real estate | HELOC | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 60.80% | 60.00%
Consumer real estate | HELOC | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.50% | 8.70%
Consumer real estate | HELOC | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.10% | 8.30%
Consumer real estate | HELOC | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 10.90% | 11.10%
Consumer real estate | HELOC | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 5.20% | 4.90%
Consumer real estate | HELOC | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.50% | 7.00%
Consumer real estate | HELOC | Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 100.00% | 100.00%
Consumer real estate | R/E Installment Loans | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 71.10% | 73.10%
Consumer real estate | R/E Installment Loans | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 9.00% | 8.00%
Consumer real estate | R/E Installment Loans | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.60% | 6.40%
Consumer real estate | R/E Installment Loans | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.00% | 7.20%
Consumer real estate | R/E Installment Loans | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 2.80% | 2.80%
Consumer real estate | R/E Installment Loans | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 2.50% | 2.50%
Consumer real estate | R/E Installment Loans | Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 100.00% | 100.00%
Permanent Mortgage | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 51.20% | 46.40%
Permanent Mortgage | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.50% | 12.80%
Permanent Mortgage | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 9.00% | 9.20%
Permanent Mortgage | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 15.90% | 14.80%
Permanent Mortgage | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.50% | 7.30%
Permanent Mortgage | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.90% | 9.50%
Permanent Mortgage | Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 100.00% | 100.00%

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