Derivative Instruments and Hedging Activities - Cash Flow Hedge Accounting on AOCI (Details) - 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]
Gains (losses) recognized in other comprehensive income	$ 2,441		$ 3,899
Interest Income | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	5,944	$ 3,577	9,297	$ 10,573
Reclassification of gains (losses) included in net income	1,355	376	2,748	647
Interest Expense | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	(7,816)	(2,860)	(11,996)	(10,043)
Reclassification of gains (losses) included in net income	$ (1,924)	$ (503)	$ (3,948)	$ (1,109)