Derivative Instruments and Hedging Activities - Cash Flow Hedge Accounting on AOCI (Details) - 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]
Gains (losses) recognized in other comprehensive income	$ (399)		$ 3,500
Interest Income | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	2,218	$ 2,578	11,515	$ 13,151
Reclassification of gains (losses) included in net income	824	857	3,572	1,504
Interest Expense | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	(1,625)	(1,577)	(13,621)	(11,620)
Reclassification of gains (losses) included in net income	$ (1,018)	$ (978)	$ (4,966)	$ (2,087)