Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Loans Assets by Internal Risk Rating (Details)

v3.7.0.1
Commercial Real Estate Loans Assets by Internal Risk Rating (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
unit
Dec. 31, 2016
USD ($)
unit
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Instruments, Commercial Real Estate Assets | unit 40 36
Commercial Real Estate Assets [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Instruments, Commercial Real Estate Assets | unit 40 36
Commercial Real Estate Loans Held-for-Investment, Unpaid Principal $ 1,560,021 $ 1,424,445
Commercial real estate assets $ 1,548,603 $ 1,412,543
Commercial Real Estate Assets [Member] | Internal Investment Grade [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Instruments, Commercial Real Estate Assets | unit 40 36
Commercial Real Estate Loans Held-for-Investment, Unpaid Principal $ 1,560,021 $ 1,424,445
Commercial real estate assets $ 1,548,603 $ 1,412,543
Commercial Real Estate Assets [Member] | Internal Noninvestment Grade [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Instruments, Commercial Real Estate Assets | unit 0 0
Commercial Real Estate Loans Held-for-Investment, Unpaid Principal $ 0 $ 0
Commercial real estate assets $ 0 $ 0