Litigation (Details) $ in Thousands	1 Months Ended			9 Months Ended
	Mar. 31, 2015 claim	Dec. 31, 2013 claim	Mar. 31, 2012 USD ($)	Sep. 30, 2017 USD ($) claim lawsuit	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Deposits | $				$ 17,312,766	$ 17,730,708
Pending Litigation | Merrick Bank Corporation and American Express Travel Related Services v. Valley National Bank
Loss Contingencies [Line Items]
Number of lawsuits consolidated (in lawsuit) | lawsuit				2
Pending Litigation | Merrick Bank Corporation v. Valley National Bank
Loss Contingencies [Line Items]
Chargebacks incurred from Direct Air Bankruptcy (in USD) | $			$ 26,200
Number of claims filed (in claim) | claim		10
Number of claims dismissed (in claim) | claim	4
Pending Litigation | Merrick Bank Corporation v. Valley National Bank | Direct Air
Loss Contingencies [Line Items]
Deposits | $			1,000
Pending Litigation | American Express Travel Related Services v. Valley National Bank
Loss Contingencies [Line Items]
Chargebacks incurred from Direct Air Bankruptcy (in USD) | $			$ 3,000
Number of claims filed (in claim) | claim				11
Number of claims dismissed (in claim) | claim				5