Derivative Instruments and Hedging Activities - Summary of Fair Value of Interest Rate Swaps (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Interest rate swap assets	$ 579	$ 16,859
Interest rate swap liabilities	8,139	48
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Other Assets [Member]
Derivative [Line Items]
Interest rate swap assets	579	16,859
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest rate swap liabilities	$ 8,139	$ 48