Leases - Components of ROU Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating leases, ROU assets	$ 251,293	$ 284,255
Finance leases, ROU assets	760	874
Total ROU assets	252,053	285,129
Operating leases, liabilities	275,248	308,060
Finance leases, liabilities	1,427	1,789
Lease liabilities	$ 276,675	$ 309,849
Operating leases, ROU assets, statement of financial position [Extensible List]	vly:OperatingAndFinanceLeaseRightofUseAsset	vly:OperatingAndFinanceLeaseRightofUseAsset
Finance leases, ROU Assets, statement of financial position [Extensible List]	vly:OperatingAndFinanceLeaseRightofUseAsset	vly:OperatingAndFinanceLeaseRightofUseAsset
Operating leases, liabilities, statement of financial position [Extensible List]	vly:OperatingAndFinanceLeaseRightofUseAsset	vly:OperatingAndFinanceLeaseRightofUseAsset
Finance leases, liabilities, statement of financial position [Extensible List]	vly:OperatingAndFinanceLeaseRightofUseAsset	vly:OperatingAndFinanceLeaseRightofUseAsset