Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassifications out of accumulated other comprehensive income, net of tax
Interest expense	$ (19,787)	$ (20,123)
Provision for income taxes	(4,255)	(11,231)
Net income	24,110	44,367
Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Net income	(563)	(2,252)
Losses on Cash Flow Hedges | Amount Reclassified from Accumulated Other Comprehensive Loss | Interest rate contracts
Reclassifications out of accumulated other comprehensive income, net of tax
Interest expense	(722)	(10)
Provision for income taxes	159	2
Net income	$ (563)	(8)
Losses on sales of available for sale securities: | Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Securities (gains) losses, net		(2,998)
Provision for income taxes		659
Net income		(2,339)
Benefit Plans | Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Salaries and employee benefits /Pension Plan Termination Expense		121
Provision for income taxes		(26)
Net income		$ 95