Derivative Instruments and Hedging Activities - Cash Flow Hedge Accounting on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	$ 28,614	$ (399)	$ 11,274	$ 3,500
Before tax	14,285	0	14,285	0
Interest Income | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	96	2,218	28,051	11,515
Before tax	2,165	824	5,234	3,572
Interest Expense | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in other comprehensive income	(239)	(1,625)	(13,924)	(13,621)
Before tax	$ (16,350)	$ (1,018)	$ (16,350)	$ (4,966)