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Risk Management and Derivatives (Risk Concentration) (Details) | 12 Months Ended
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Dec. 31, 2018 borrower
Office/Industrial |
Concentration Risk [Line Items] |
Concentration risk, percentage | 32.70%
Land |
Concentration Risk [Line Items] |
Concentration risk, percentage | 18.40%
Entertainment/Leisure |
Concentration Risk [Line Items] |
Concentration risk, percentage | 17.40%
Hotel |
Concentration Risk [Line Items] |
Concentration risk, percentage | 7.10%
Mixed Use/Mixed Collateral |
Concentration Risk [Line Items] |
Concentration risk, percentage | 7.00%
Customer Concentration Risk |
Concentration Risk [Line Items] |
Number of large borrowers or tenants | 5
Concentration risk percentage of revenue (no more than) | 14.40%
Concentration risk percentage of one single customer, revenue (no more than) | 6.70%
California | Geographic Concentration Risk |
Concentration Risk [Line Items] |
Concentration risk, percentage | 16.50%
New York | Geographic Concentration Risk |
Concentration Risk [Line Items] |
Concentration risk, percentage | 11.00%

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