Loans - Loans by FICO Score Percentage, Consumer (Details) - Accounts Receivable - Credit Concentration Risk	12 Months Ended
	Dec. 31, 2019
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	100.00%
R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	100.00%
FICO score 740 or greater | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	62.00%
FICO score 740 or greater | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	71.90%
FICO score 720-739 | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	8.60%
FICO score 720-739 | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	8.30%
FICO score 700-719 | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	7.60%
FICO score 700-719 | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	6.30%
FICO score 660-699 | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	10.80%
FICO score 660-699 | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	8.10%
FICO score 620-659 | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	4.70%
FICO score 620-659 | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	2.80%
FICO score less than 620 | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	6.30%
FICO score less than 620 | R/E Installment Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	2.60%