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Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative assets, fair value $ 153 $ 1,681
Derivative liabilities, fair value 153 1,681
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional 56,552 57,502
Derivative assets, fair value 153 1,681
Derivative liabilities, fair value 153 1,681
Not Designated as Hedging Instrument | Interest rate swap contracts    
Derivative [Line Items]    
Notional 56,552 57,502
Derivative assets, fair value 153 1,681
Derivative liabilities, fair value $ 153 $ 1,681