Derivative Instruments and Hedging Activities - Effect of Derivatives on Interest Income (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Loss) gain on derivative, net	$ (1,154)	$ 1,041	$ 3,154
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Loss) gain on derivative, net	(1,062)	1,208	3,567
Interest Income | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Loss) gain on derivative, net	(92)	(167)	(413)
Interest Income | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Loss) gain on derivative, net	2,611	5,159	7,641
Interest Expense | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Loss) gain on derivative, net	$ (3,673)	$ (3,951)	$ (4,074)