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
Jun. 30, 2017
USD ($)
loan
unit
Dec. 31, 2016
USD ($)
loan
unit
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans | unit 46 36
Commercial Real Estate Assets [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans | loan 46 36
Unpaid Principal Balance $ 1,796,247 $ 1,424,445
Commercial real estate assets $ 1,782,749 $ 1,412,543
Commercial Real Estate Assets [Member] | Internal Investment Grade [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans | loan 46 36
Unpaid Principal Balance $ 1,796,247 $ 1,424,445
Commercial real estate assets $ 1,782,749 $ 1,412,543
Commercial Real Estate Assets [Member] | Internal Noninvestment Grade [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans | loan 0 0
Unpaid Principal Balance $ 0 $ 0
Commercial real estate assets $ 0 $ 0