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
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 1,114,548 $ 926,377 $ 660,953 $ 290,910 $ 45,605 $ 0
Loans and Leases Receivable, Percentage of Total, Commercial 100.00%   100.00%      
United States, Western Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 180,943   $ 131,488      
Loans and Leases Receivable, Percentage of Total, Commercial 16.20%   19.90%      
United States, Southeastern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 104,688   $ 79,118      
Loans and Leases Receivable, Percentage of Total, Commercial 9.40%   12.00%      
United States, Southwestern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 266,238   $ 161,721      
Loans and Leases Receivable, Percentage of Total, Commercial 23.90%   24.40%      
United States, Northeastern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 491,503   $ 238,913      
Loans and Leases Receivable, Percentage of Total, Commercial 44.10%   36.20%      
United States, Midwestern Region [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial real estate assets $ 71,176   $ 49,713      
Loans and Leases Receivable, Percentage of Total, Commercial 6.40%   7.50%