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Fair Value Measurement Of Assets And Liabilities (Assets And Liabilities Measured At Fair Value On A Recurring And Non-Recurring Basis) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement $ 15,400,000 $ 24,300,000
Contractual Unpaid Principal [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Junior Subordinated Notes 146,700,000 157,000,000
Recurring Fair Value Measurements [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 830,974,000 566,520,000
Trading securities 22,190,000 21,938,000
Loans held for sale 15,892,000 [1] 25,169,000 [1]
Other assets 6,481,000 [2] 5,211,000 [2]
Total assets 875,537,000 618,838,000
Junior subordinated debentures issued to VNB Capital Trust I 151,409,000 [3] 160,478,000 [3]
Other liabilities 20,580,000 [2] 21,854,000 [2]
Total liabilities 171,989,000 182,332,000
Recurring Fair Value Measurements [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 114,419,000 73,685,000
Total assets 114,419,000 73,685,000
Junior subordinated debentures issued to VNB Capital Trust I 151,409,000 [3] 160,478,000 [3]
Total liabilities 151,409,000 160,478,000
Recurring Fair Value Measurements [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 631,835,000 415,524,000
Trading securities 22,190,000 21,938,000
Loans held for sale 15,892,000 [1] 25,169,000 [1]
Other assets 6,481,000 [2] 5,211,000 [2]
Total assets 676,398,000 467,842,000
Other liabilities 20,580,000 [2] 21,854,000 [2]
Total liabilities 20,580,000 21,854,000
Recurring Fair Value Measurements [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 84,720,000 77,311,000
Total assets 84,720,000 77,311,000
Recurring Fair Value Measurements [Member] | U.S. Treasury Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 49,039,000  
Recurring Fair Value Measurements [Member] | U.S. Treasury Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 49,039,000  
Recurring Fair Value Measurements [Member] | U.S. Government Agency Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 107,846,000 90,748,000
Recurring Fair Value Measurements [Member] | U.S. Government Agency Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 107,846,000 90,748,000
Recurring Fair Value Measurements [Member] | Obligations Of States And Political Subdivisions [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 19,685,000 20,214,000
Recurring Fair Value Measurements [Member] | Obligations Of States And Political Subdivisions [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 19,685,000 20,214,000
Recurring Fair Value Measurements [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 482,929,000 310,137,000
Recurring Fair Value Measurements [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 436,711,000 259,977,000
Recurring Fair Value Measurements [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 46,218,000 50,160,000
Recurring Fair Value Measurements [Member] | Trust Preferred Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 65,416,000 63,858,000
Recurring Fair Value Measurements [Member] | Trust Preferred Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 10,060,000 19,576,000
Recurring Fair Value Measurements [Member] | Trust Preferred Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 16,854,000 17,131,000
Recurring Fair Value Measurements [Member] | Trust Preferred Securities [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 38,502,000 27,151,000
Recurring Fair Value Measurements [Member] | Corporate And Other Debt Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 57,948,000 39,610,000
Recurring Fair Value Measurements [Member] | Corporate And Other Debt Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 28,422,000 30,603,000
Recurring Fair Value Measurements [Member] | Corporate And Other Debt Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 29,526,000 9,007,000
Recurring Fair Value Measurements [Member] | Equity Securities [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 48,111,000 41,953,000
Recurring Fair Value Measurements [Member] | Equity Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 26,898,000 23,506,000
Recurring Fair Value Measurements [Member] | Equity Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 21,213,000 18,447,000
Non-Recurring Fair Value Measurements [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Collateral dependent impaired loans 62,273,000 [4] 66,854,000 [4]
Loan servicing rights 9,913,000 9,078,000
Foreclosed assets 8,430,000 15,874,000
Total 80,616,000 91,806,000
Non-Recurring Fair Value Measurements [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Collateral dependent impaired loans 62,273,000 [4] 66,854,000 [4]
Loan servicing rights 9,913,000 9,078,000
Foreclosed assets 8,430,000 15,874,000
Total $ 80,616,000 $ 91,806,000
[1] Loans held for sale (which consist of residential mortgages) are carried at fair value and had contractual unpaid principal balances totaling approximately $15.4 million and $24.3 million at March 31, 2012 and December 31, 2011, respectively.
[2] Derivative financial instruments are included in this category.
[3] (3) The junior subordinated debentures had contractual unpaid principal obligations totaling $146.7 million and $157.0 million at March 31, 2012 and December 31, 2011, respectively.
[4] Excludes covered loans acquired in the FDIC-assisted transactions and other purchased credit-impaired loans acquired in the first quarter of 2012.