Derivative Instruments and Hedging Activities - Effect Of Derivatives On Interest Income (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	$ (569)	$ (127)	$ (1,200)	$ (462)
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	1,355	376	2,748	647
Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	$ (1,924)	$ (503)	$ (3,948)	$ (1,109)