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Loans - Loans by FICO Score, Consumer (Details) - Consumer | Dec. 31, 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) | 8.50% | 8.70%
HELOC | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.60% | 8.30%
HELOC | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 10.90% | 11.10%
HELOC | FICO score 620-659 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 5.10% | 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) | 71.30% | 73.10%
R/E installment loans | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 8.80% | 8.00%
R/E installment loans | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.00% | 6.40%
R/E installment loans | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.60% | 7.20%
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%
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%
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) | 51.80% | 46.40%
Permanent mortgage | FICO score 720-739 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 7.60% | 12.80%
Permanent mortgage | FICO score 700-719 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 10.60% | 9.20%
Permanent mortgage | FICO score 660-699 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average refreshed FICO score (percent) | 14.70% | 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) | 8.80% | 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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