Derivative Instruments and Hedging Activities - Summary of Fair Value of Interest Rate Swaps (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Interest rate swap assets	$ 9,074	$ 16,859
Interest rate swap liabilities	1,289	48
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Other Assets [Member]
Derivative [Line Items]
Interest rate swap assets	9,074	16,859
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest rate swap liabilities	$ 1,289	$ 48