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Loans (Loans by FICO Score, Consumer) (Details) | Jun. 30, 2018 | Dec. 31, 2017
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HELOC | FICO score 740 or greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 61.40% | 60.00%
HELOC | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.70% | 8.70%
HELOC | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.90% | 8.30%
HELOC | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 10.70% | 11.10%
HELOC | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 4.80% | 4.90%
HELOC | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.50% | 7.00%
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) | 74.80% | 73.10%
R/E Installment Loans | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.70% | 8.00%
R/E Installment Loans | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.10% | 6.40%
R/E Installment Loans | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.70% | 7.20%
R/E Installment Loans | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 2.60% | 2.80%
R/E Installment Loans | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 2.10% | 2.50%
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) | 50.40% | 46.40%
Permanent Mortgage | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 10.20% | 12.80%
Permanent Mortgage | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 9.20% | 9.20%
Permanent Mortgage | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 13.90% | 14.80%
Permanent Mortgage | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 6.80% | 7.30%
Permanent Mortgage | FICO score less than 620 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 9.50% | 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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