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Risk Management and Derivatives (Risk Concentration) (Details) | 12 Months Ended
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Dec. 31, 2016 borrower
Land |
Concentration Risk [Line Items] |
Concentration risk, percentage | 22.40%
Office/Industrial |
Concentration Risk [Line Items] |
Concentration risk, percentage | 22.90%
Hotel |
Concentration Risk [Line Items] |
Concentration risk, percentage | 12.50%
Commercial Entertainment and Leisure Real Estate |
Concentration Risk [Line Items] |
Concentration risk, percentage | 10.60%
Condominium Units |
Concentration Risk [Line Items] |
Concentration risk, percentage | 10.00%
Mixed Use Collateral |
Concentration Risk [Line Items] |
Concentration risk, percentage | 10.00%
Customer Concentration Risk |
Concentration Risk [Line Items] |
Number of large borrowers or tenants | 5
Concentration risk percentage of revenue (no more than) | 18.40%
Concentration risk percentage of one single customer, revenue (no more than) | 5.90%
New York | Geographic Concentration Risk |
Concentration Risk [Line Items] |
Concentration risk, percentage | 19.00%
California | Geographic Concentration Risk |
Concentration Risk [Line Items] |
Concentration risk, percentage | 13.00%

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