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Loans (Loans by FICO Score, Consumer) (Details) | Sep. 30, 2017 | Dec. 31, 2016
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HELOC | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 58.50% | 56.90%
HELOC | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.80% | 8.80%
HELOC | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.20% | 8.60%
HELOC | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 12.10% | 13.20%
HELOC | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 5.60% | 5.60%
HELOC | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.80% | 6.90%
HELOC | Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 100.00% | 100.00%
R E Installment Loans | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 71.80% | 70.30%
R E Installment Loans | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.10% | 8.30%
R E Installment Loans | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.60% | 6.80%
R E Installment Loans | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.40% | 8.40%
R E Installment Loans | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 2.70% | 3.50%
R E Installment Loans | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 2.40% | 2.70%
R E Installment Loans | Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 100.00% | 100.00%
Permanent Mortgage Portfolio Segment | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 45.10% | 45.00%
Permanent Mortgage Portfolio Segment | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 12.80% | 9.50%
Permanent Mortgage Portfolio Segment | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 11.00% | 9.20%
Permanent Mortgage Portfolio Segment | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 15.30% | 17.10%
Permanent Mortgage Portfolio Segment | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.00% | 9.10%
Permanent Mortgage Portfolio Segment | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.80% | 10.10%
Permanent Mortgage Portfolio Segment | Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 100.00% | 100.00%

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