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Fair Value Measurement Of Assets And Liabilities (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unpaid principal balances of loans held for sale $ 24,300,000 $ 58,400,000
Junior Subordinated Notes 20,600,000  
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 566,520,000 1,035,282,000
Trading securities 21,938,000 31,894,000
Loans held for sale 25,169,000 [1] 58,958,000 [1]
Other assets 5,211,000 [2] 8,414,000 [2]
Total assets 618,838,000 1,134,548,000
Junior subordinated debentures issued to VNB Capital Trust I 160,478,000 [3] 161,734,000 [3]
Other liabilities 21,854,000 [2] 1,379,000 [2]
Total liabilities 182,332,000 163,113,000
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 73,685,000 253,426,000
Trading securities   9,991,000
Total assets 73,685,000 263,417,000
Junior subordinated debentures issued to VNB Capital Trust I 160,478,000 [3] 161,734,000 [3]
Total liabilities 160,478,000 161,734,000
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 415,524,000 643,201,000
Trading securities 21,938,000  
Loans held for sale 25,169,000 [1] 58,958,000 [1]
Other assets 5,211,000 [2] 8,414,000 [2]
Total assets 467,842,000 710,573,000
Other liabilities 21,854,000 [2] 1,379,000 [2]
Total liabilities 21,854,000 1,379,000
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 77,311,000 138,655,000
Trading securities   21,903,000
Total assets 77,311,000 160,558,000
U.S. Treasury Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities   163,810,000
U.S. Treasury Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities   163,810,000
U.S. Government Agency Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 90,748,000 88,800,000
U.S. Government Agency Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 90,748,000 88,800,000
Obligations Of States And Political Subdivisions [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 20,214,000 29,462,000
Obligations Of States And Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 20,214,000 29,462,000
Residential Mortgage-Backed Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 310,137,000 610,358,000
Residential Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 259,977,000 514,711,000
Residential Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 50,160,000 95,647,000
Trust Preferred Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 63,858,000 41,083,000
Trust Preferred Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 19,576,000 20,343,000
Trust Preferred Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 17,131,000  
Trust Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 27,151,000 20,740,000
Corporate And Other Debt Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 39,610,000 53,961,000
Corporate And Other Debt Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 30,603,000 41,046,000
Corporate And Other Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 9,007,000  
Corporate And Other Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities   12,915,000
Equity Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 41,953,000 47,808,000
Equity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 23,506,000 28,227,000
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 18,447,000 10,228,000
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities   $ 9,353,000
[1] Loans held for sale (which consists of residential mortgages) are carried at fair value and had contractual unpaid principal balances totaling approximately $24.3 million and $58.4 million at December 31, 2011 and 2010, respectively.
[2] Derivative financial instruments are included in this category.
[3] The junior subordinated debentures had contractual unpaid principal obligations totaling $157.0 million at both December 31, 2011 and 2010.