Annual report pursuant to Section 13 and 15(d)

Derivatives - Narrative (Details)

v3.7.0.1
Derivatives - Narrative (Details)
Dec. 31, 2016
USD ($)
interest_rate_swap
Dec. 31, 2015
USD ($)
interest_rate_swap
Derivative [Line Items]    
Derivative amount not offset against collateral $ 0 $ 0
Cash flow hedge | Interest Rate Swap    
Derivative [Line Items]    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net 5,521,000  
Recurring    
Derivative [Line Items]    
Derivative asset 8,521,000  
Derivative liability 16,948,000 $ 13,470,000
Recurring | Level 2    
Derivative [Line Items]    
Derivative asset $ 8,521,000  
Number of instruments held | interest_rate_swap 7 7
Derivative liability $ 16,948,000 $ 13,470,000
Recurring | Level 2 | Interest Rate Swap    
Derivative [Line Items]    
Number of derivative instruments held | interest_rate_swap 1  
Derivative asset $ 8,521,000  
Derivative liability $ 16,948,000 $ 13,470,000