Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Assets by Geographic Location (Details)

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Commercial Real Estate Assets by Geographic Location (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 1,782,749 $ 1,548,603 $ 1,412,543 $ 926,377 $ 744,259 $ 660,953
Percentage of Commercial Portfolio 100.00%   100.00%      
United States, Northeastern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 655,248   $ 578,762      
Percentage of Commercial Portfolio 36.80%   41.00%      
United States, Western Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 389,311   $ 250,044      
Percentage of Commercial Portfolio 21.80%   17.70%      
United States, Southwestern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 340,094   $ 267,944      
Percentage of Commercial Portfolio 19.10%   19.00%      
United States, Southeastern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 319,609   $ 239,194      
Percentage of Commercial Portfolio 17.90%   16.90%      
United States, Midwestern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 78,487   $ 76,599      
Percentage of Commercial Portfolio 4.40%   5.40%