Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Stated interest rate of the subordinated debt.

+ References

No definition available.

+ Details

Name:	us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-Term Debt, Prepayment Repurchase Borrowings, Amount

+ References

No definition available.

+ Details

Name:	vly_LongTermDebtPrepaymentRepurchaseBorrowingsAmount
Namespace Prefix:	vly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Repurchase Borrowings, Interest Rate

+ References

No definition available.

+ Details

Name:	vly_RepurchaseBorrowingsInterestRate
Namespace Prefix:	vly_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Subordinated Debt, Secured Overnight Financing Rate, Term

+ References

No definition available.

+ Details

Name:	vly_SubordinatedDebtSecuredOvernightFinancingRateTerm
Namespace Prefix:	vly_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vly_SubordinatedNotesDueJanuary2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vly_SubordinatedNotesDueJuly2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vly_SubordinatedNotesDueSeptember2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vly_SubordinatedNotesDueJune2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowed Funds - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 05, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted average interest rate for short-term borrowings		0.44%	0.44%		0.44%		1.68%
Loss on extinguishment of debt			$ (2,353,000)	$ 0	$ (2,353,000)	$ 0
Subordinated borrowing interest rate	5.25%
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Weighted average interest rate for long-term borrowings		2.11%	2.11%		2.11%		2.23%
Long-Term Borrowings
Debt Instrument [Line Items]
Weighted average interest rate for long-term borrowings		3.33%	3.33%		3.33%		1.94%
Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt, net	$ 115,000,000.0
Subordinated debt initial term	5 years
Subordinated debt SOFR term	3 months
Subordinated Debt \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated debt basis points	5.14%
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Amount of hedged debt		$ 1,100,000,000	$ 1,100,000,000		$ 1,100,000,000
Subordinated Notes Due January 2022
Debt Instrument [Line Items]
Prepayment of long-term institutional repurchase borrowings		$ 50,000,000
Repurchase borrowings, interest rate		3.70%
Subordinated Notes Due July 2025
Debt Instrument [Line Items]
Subordinated borrowing interest rate					4.55%
Subordinated Notes Due July 2025 \| Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt, net		$ 100,000,000	100,000,000		$ 100,000,000
Subordinated Notes Due September 2023
Debt Instrument [Line Items]
Subordinated borrowing interest rate					5.125%
Subordinated Notes Due September 2023 \| Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt, net		125,000,000	125,000,000		$ 125,000,000
Subordinated Notes Due April 2026
Debt Instrument [Line Items]
Subordinated borrowing interest rate					6.25%
Subordinated Notes Due April 2026 \| Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt, net		$ 60,000,000	$ 60,000,000		$ 60,000,000