Balance Sheet Offsetting - Summary of Valley's Financial Instruments that are Eligible for Offset (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives And Hedging Activities [Line Items]
Gross Amounts Recognized, Total	$ 540,439	$ 546,395
Gross Amounts Offset, Total
Net Amounts Presented, Total	540,439	546,395
Net Amount, Total
Repurchase Agreements [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Recognized, Liabilities	520,000	520,000
Gross Amounts Offset, Liabilities
Securities sold under agreements to repurchase	520,000	520,000
Net Amount, Liabilities
Interest Rate Caps and Swaps, Liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Net Amount, Total
Gross Amounts Recognized, Liabilities	20,439	26,395
Gross Amounts Offset, Liabilities
Net Amounts Presented, Liabilities	20,439	26,395
Interest Rate Caps and Swaps, Assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Recognized, Assets	14,805	7,677
Gross Amounts Offset, Assets
Net Amounts Presented, Assets	14,805	7,677
Gross Amounts Not Offset, Assets	6,521	7,002
Financial Instruments [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Total	(8,284)	(675)
Financial Instruments [Member] | Repurchase Agreements [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Liabilities
Financial Instruments [Member] | Interest Rate Caps and Swaps, Liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Liabilities	(8,284)	(675)
Financial Instruments [Member] | Interest Rate Caps and Swaps, Assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Assets	(8,284)	(675)
Cash Collateral [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Total	(532,155)	(545,720)
Cash Collateral [Member] | Repurchase Agreements [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Liabilities	(520,000)	(520,000)
Cash Collateral [Member] | Interest Rate Caps and Swaps, Liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Liabilities	(12,155)	(25,720)
Cash Collateral [Member] | Interest Rate Caps and Swaps, Assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amounts Not Offset, Assets