Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value [Member] \| Recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	$ 955,270	$ 807,816
Trading securities	22,127	22,157
Loans held for sale	135,052	120,230
Other assets	7,469	7,916
Total assets	1,119,918	958,119
Junior subordinated debentures issued to VNB Capital Trust I	149,767	147,595
Other liabilities	25,492	26,594
Total liabilities	175,259	174,189
Fair Value [Member] \| Recurring fair value measurements [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	95,458	97,625
Fair Value [Member] \| Recurring fair value measurements [Member] \| U.S. government agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	58,990	45,762
Fair Value [Member] \| Recurring fair value measurements [Member] \| Obligations of states and political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	42,619	16,627
Fair Value [Member] \| Recurring fair value measurements [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	568,323	510,154
Fair Value [Member] \| Recurring fair value measurements [Member] \| Trust preferred securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	66,329	57,432
Fair Value [Member] \| Recurring fair value measurements [Member] \| Corporate and other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	76,247	30,708
Fair Value [Member] \| Recurring fair value measurements [Member] \| Equity securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	47,304	49,508
Fair Value [Member] \| Non-recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	62,208	65,231
Loan servicing rights	11,154	16,201
Foreclosed assets	15,970	33,251
Total	89,332	114,683
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	149,382	154,677
Trading securities
Loans held for sale
Other assets
Total assets	149,382	154,677
Junior subordinated debentures issued to VNB Capital Trust I	149,767	147,595
Other liabilities
Total liabilities	149,767	147,595
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	95,458	97,625
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| U.S. government agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| Obligations of states and political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| Trust preferred securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| Corporate and other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	27,624	28,444
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Recurring fair value measurements [Member] \| Equity securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	26,300	28,608
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Non-recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans
Loan servicing rights
Foreclosed assets
Total
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	727,968	581,465
Trading securities	22,127	22,157
Loans held for sale	135,052	120,230
Other assets	7,469	7,916
Total assets	892,616	731,768
Junior subordinated debentures issued to VNB Capital Trust I
Other liabilities	25,492	26,594
Total liabilities	25,492	26,594
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| U.S. government agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	58,990	45,762
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| Obligations of states and political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	42,619	16,627
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	538,546	478,783
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| Trust preferred securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	18,186	17,129
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| Corporate and other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	48,623	2,264
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member] \| Equity securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	21,004	20,900
Significant Other Observable Inputs (Level 2) [Member] \| Non-recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans
Loan servicing rights
Foreclosed assets
Total
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	77,920	71,674
Trading securities
Loans held for sale
Other assets
Total assets	77,920	71,674
Junior subordinated debentures issued to VNB Capital Trust I
Other liabilities
Total liabilities
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| U.S. Treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| U.S. government agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| Obligations of states and political subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| Residential mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	29,777	31,371
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| Trust preferred securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	48,143	40,303
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| Corporate and other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Recurring fair value measurements [Member] \| Equity securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Non-recurring fair value measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	62,208	65,231
Loan servicing rights	11,154	16,201
Foreclosed assets	15,970	33,251
Total	$ 89,332	$ 114,683

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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- Definition

Amount of subordinated debt obligations (also known as subordinated loan, subordinated bond, subordinated debenture or junior debt) which has a priority ranking after other debts in a dissolution, measured at fair value.

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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-Publisher AICPA

-Name Statement of Position (SOP)

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- Definition

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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Fair value of the collateral dependent impaired loans.

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Non-recurring fair value measurements, asset liability, total.

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No definition available.

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Total assets fair value disclosure

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- Definition

Total liabilities fair value disclosure

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