Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial real estate assets $ 1,412,543 $ 660,953 $ 0 $ 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 $ 250,044 $ 131,488    
Loans and Leases Receivable, Percentage of Total, Commercial 17.70% 19.90%    
United States, Southeastern Region [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial real estate assets $ 239,194 $ 79,118    
Loans and Leases Receivable, Percentage of Total, Commercial 16.90% 12.00%    
United States, Southwestern Region [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial real estate assets $ 267,944 $ 161,721    
Loans and Leases Receivable, Percentage of Total, Commercial 19.00% 24.40%    
United States, Northeastern Region [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial real estate assets $ 578,762 $ 238,913    
Loans and Leases Receivable, Percentage of Total, Commercial 41.00% 36.20%    
United States, Midwestern Region [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial real estate assets $ 76,599 $ 49,713    
Loans and Leases Receivable, Percentage of Total, Commercial 5.40% 7.50%