Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Assets by Property Type (Details)

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Commercial Real Estate Assets by Property Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 2,171,344 $ 1,782,749 $ 1,412,543 $ 1,114,548 $ 926,377 $ 660,953
Percentage of Commercial Portfolio 100.00%   100.00%      
Office Building [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 1,133,866   $ 718,780      
Percentage of Commercial Portfolio 52.20%   50.90%      
Multifamily [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 385,222   $ 260,683      
Percentage of Commercial Portfolio 17.70%   18.50%      
Retail Site [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 247,196   $ 237,414      
Percentage of Commercial Portfolio 11.40%   16.80%      
Hotel [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 209,874   $ 90,585      
Percentage of Commercial Portfolio 9.70%   6.40%      
Industrial Property [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 195,186   $ 105,081      
Percentage of Commercial Portfolio 9.00%   7.40%