Derivative Financial Instruments - Effect of Cash Flow Hedging on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Amount of Loss Recognized in OCI on Derivative	$ 724
Amount of Loss Reclassified from OCI into Income	(15)	$ (147)
Interest Rate Products
Derivative [Line Items]
Amount of Loss Recognized in OCI on Derivative	724
Settled Interest Rate Swaps
Derivative [Line Items]
Amount of Loss Recognized in OCI on Derivative	0
Interest Expense
Derivative [Line Items]
Amount of Loss Reclassified from OCI into Income	15	147
Interest Expense | Interest Rate Products
Derivative [Line Items]
Amount of Loss Reclassified from OCI into Income	(27)	105
Interest Expense | Settled Interest Rate Swaps
Derivative [Line Items]
Amount of Loss Reclassified from OCI into Income	$ 42	$ 42