Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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This element represents amortization expense of finite lived intangible assets and net impairment charges on loan servicing rights during the reporting period.

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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 577,534,000us-gaap_Goodwill		$ 575,892,000us-gaap_Goodwill
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Net recoveries of impairment charges on its loan servicing rights	84,000	100,000
Total amortization expense - other intangible assets	2,400,000vly_FiniteLivedIntangibleAssetNet	2,400,000vly_FiniteLivedIntangibleAssetNet
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years	11 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period, years	18 years
Core Deposits and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of core deposits and intangibles	$ 0	$ 0