Fair Value Measurement Of Assets And Liabilities (Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) (USD $)	Dec. 31, 2011		Dec. 31, 2010
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Interest bearing deposit with banks	$ 6,483,000		$ 63,657,000
Accrued interest receivable	52,527,000		59,126,000
Junior subordinated debentures issued to capital trusts (carrying amount includes fair value of $160,478 at December 31, 2011 and $161,734 at December 31, 2010 for VNB Capital Trust I), Carrying Amount	20,600,000
Carrying Amount [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Cash and due from banks	372,566,000		302,629,000
Interest bearing deposit with banks	6,483,000		63,657,000
Investment securities held to maturity	1,958,916,000		1,923,993,000
Investment securities available for sale	566,520,000		1,035,282,000
Trading securities	21,938,000		31,894,000
Loans held for sale	25,169,000		58,958,000
Net loans	9,665,839,000		9,241,091,000
Accrued interest receivable	52,527,000		59,126,000
Federal Reserve Bank and Federal Home Loan Bank stock	129,669,000	[1]	139,778,000	[1]
Derivatives	5,211,000	[1]	8,414,000	[1]
Deposits without stated maturities	7,171,718,000		6,630,763,000
Deposits with stated maturities	2,501,384,000		2,732,851,000
Short-term borrowings	212,849,000		192,318,000
Long-term borrowings	2,726,099,000		2,933,858,000
Junior subordinated debentures issued to capital trusts (carrying amount includes fair value of $160,478 at December 31, 2011 and $161,734 at December 31, 2010 for VNB Capital Trust I), Carrying Amount	185,598,000		186,922,000
Accrued interest payable	3,798,000	[2]	4,344,000	[2]
Derivatives	21,854,000	[2]	1,379,000	[2]
Fair Value [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Cash and due from banks	372,566,000		302,629,000
Interest bearing deposit with banks	6,483,000		63,657,000
Investment securities held to maturity	2,027,197,000		1,898,872,000
Investment securities available for sale	566,520,000		1,035,282,000
Trading securities	21,938,000		31,894,000
Loans held for sale	25,169,000		58,958,000
Net loans	9,645,517,000		9,035,066,000
Accrued interest receivable	52,527,000		59,126,000
Federal Reserve Bank and Federal Home Loan Bank stock	129,669,000	[1]	139,778,000	[1]
Derivatives	5,211,000	[1]	8,414,000	[1]
Deposits without stated maturities	7,171,718,000		6,630,763,000
Deposits with stated maturities	2,557,119,000		2,783,680,000
Short-term borrowings	215,179,000		195,360,000
Long-term borrowings	3,154,150,000		3,201,090,000
Junior subordinated debentures issued to capital trusts (carrying amount includes fair value of $160,478 at December 31, 2011 and $161,734 at December 31, 2010 for VNB Capital Trust I), Fair Value	186,098,000		187,480,000
Accrued interest payable	3,798,000	[2]	4,344,000	[2]
Derivatives	21,854,000	[2]	1,379,000	[2]
Junior Subordinated Debt [Member] | VNB Capital Trust I [Member] | Fair Value [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Junior subordinated debentures issued to capital trusts fair value disclosure	$ 160,478		$ 161,734

[1] Included in other assets.

[2] Included in accrued expenses and other liabilities.