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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	$ (194)	$ (121)	$ (1,394)	$ (583)
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	824	857	3,572	1,504
Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on derivative, net	$ (1,018)	$ (978)	$ (4,966)	$ (2,087)