Annual report pursuant to Section 13 and 15(d)

Derivatives - Narrative (Details)

v3.19.1
Derivatives - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
interest_rate_swap
Dec. 31, 2017
USD ($)
interest_rate_swap
Dec. 31, 2016
USD ($)
Derivative [Line Items]      
Derivative amount not offset against collateral $ 0 $ 0  
Unrealized loss on derivative financial instruments 3,151,000 0 $ 0
Recurring      
Derivative [Line Items]      
Derivative asset 10,552,000 7,058,000  
Derivative liability 6,039,000 13,817,000  
Level 2 | Recurring      
Derivative [Line Items]      
Derivative asset 10,552,000 $ 7,058,000  
Number of instruments held | interest_rate_swap   6  
Derivative liability 6,039,000 $ 13,817,000  
Interest Rate Swap | Cash flow hedge      
Derivative [Line Items]      
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net $ 1,890,000    
Interest Rate Swap | Level 2 | Recurring      
Derivative [Line Items]      
Number of derivative instruments held | interest_rate_swap 2 2  
Derivative asset $ 10,552,000 $ 7,058,000  
Number of instruments held | interest_rate_swap 2    
Derivative liability $ 6,039,000