Derivative Financial Instruments - Effect of Derivative Financial Instruments on Other Comprehensive Income (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Interest Rate Products - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	$ (701)		$ (1,092)
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)		$ 291		$ 799