Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation write-downs charged to non-interest income related to non-performing loan held for sale	$ 3,000,000
Fair value, unobservable inputs, quantitative information for assets measured on non-recurring basis, impaired loans non-current appraisal discount percentage	38.20%
Impaired collateral dependent loans, charge-offs	6,500,000	26,900,000
Collateral dependent impaired loans, recorded investment	15,000,000	41,800,000
Specific valuation allowance allocations	1,000,000	6,100,000
Reported net carrying amount of impaired loans	14,000,000	35,700,000
Valuation of loan servicing rights, discount rate	8.00%
Net recoveries of impairment charges	88,000	2,500,000
Appraisal of foreclosed asset discount	2.30%
Foreclosed assets measured at fair value upon initial recognition	18,100,000vly_ForeclosedAssetsMeasuredAtFairValue	25,900,000vly_ForeclosedAssetsMeasuredAtFairValue
Allowance for loan losses, charge-offs	3,700,000	5,700,000
Loss due to re-measurement of repossessed assets	4,700,000	3,100,000
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation of loan servicing rights, prepayment rate	0.00%
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation of loan servicing rights, prepayment rate	27.00%
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Non-performing loans held for sale	$ 7,130,000

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Amount of reserve for write-down of a mortgage loan on real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.7)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

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- Definition

The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(6),(7)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

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- Definition

Allowance For Covered Loan Losses Net Charge Offs

+ References

No definition available.

+ Details

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- Definition

Collateral Dependent Impaired Loans Carrying Value

+ References

No definition available.

+ Details

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- Definition

Fair Value, Unobservable Inputs, Quantitative Information For Assets Measured On Non-Recurring Basis, Foreclosed Asset Appraisal Discount Percentage

+ References

No definition available.

+ Details

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- Definition

Fair value, unobservable inputs, quantitative information for assets measured on non-recurring basis, impaired loans non-current appraisal discount percentage.

+ References

No definition available.

+ Details

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- Definition

Fair value, unobservable inputs, quantitative information for assets measured on non-recurring basis, loan servicing rights discount rate.

+ References

No definition available.

+ Details

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- Definition

Fair value, unobservable inputs, quantitative information for assets measured on non-recurring basis, loan servicing rights prepayment rate.

+ References

No definition available.

+ Details

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- Definition

Certain foreclosed assets (consisting of other real estate owned and other repossessed assets), upon initial recognition and transfer from loans, are re-measured and reported at fair value through a charge-off to the allowance for loan losses based upon the fair value of the foreclosed assets. The fair value of a foreclosed asset, upon initial recognition, is typically estimated using Level 3 inputs, consisting of an appraisal that is significantly adjusted based on customized discounting criteria.

+ References

No definition available.

+ Details

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- Definition

This amount represents the direct charge-off the allowance for loan losses related to the collateral dependent impaired loans.

+ References

No definition available.

+ Details

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- Definition

Impaired loans, reported net carrying value.

+ References

No definition available.

+ Details

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- Definition

Specific valuation for loan losses related to impaired loans which are evaluated for impairment on an individual basis.

+ References

No definition available.

+ Details

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- Definition

This element represents a loss due to the re-measurement of repossessed asset at fair value subsequent to initial recognition.

+ References

No definition available.

+ Details

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- Definition

Non Performing Loans Held-For-Sale, Fair Value Disclosure

+ References

No definition available.

+ Details

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