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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
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreclosed assets $ 24,500 $ 22,400
Fair Value [Member] | Recurring fair value measurements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 807,816 566,520
Trading securities 22,157 21,938
Loans held for sale 120,230 25,169 [1]
Other assets 7,916 5,211 [2]
Total assets 958,119 618,838
Junior subordinated debentures issued to VNB Capital Trust I 147,595 160,478 [3]
Other liabilities 26,594 21,854 [2]
Total liabilities 174,189 182,332
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 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 45,762 90,748
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 16,627 20,214
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 510,154 310,137
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 57,432 70,424
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 30,708 33,044
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 49,508 41,953
Fair Value [Member] | Non-recurring fair value measurements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Collateral dependent impaired loans 65,231 66,854 [4]
Loan servicing rights 16,201 9,078
Foreclosed assets 33,251 15,874
Total 114,683 91,806
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 154,677 73,685
Total assets 154,677 73,685
Junior subordinated debentures issued to VNB Capital Trust I 147,595 160,478 [3]
Total liabilities 147,595 160,478
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 97,625  
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   19,575
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 28,444 30,604
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 28,608 23,506
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 581,465 415,524
Trading securities 22,157 21,938
Loans held for sale 120,230 25,169 [1]
Other assets 7,916 5,211 [2]
Total assets 731,768 467,842
Other liabilities 26,594 21,854 [2]
Total liabilities 26,594 21,854
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 45,762 90,748
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 16,627 20,214
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 478,783 259,977
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 17,129 23,698
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 2,264 2,440
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 20,900 18,447
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 71,674 77,311
Total assets 71,674 77,311
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 31,371 50,160
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 40,303 27,151
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 65,231 66,854 [4]
Loan servicing rights 16,201 9,078
Foreclosed assets 33,251 15,874
Total $ 114,683 $ 91,806
[1] Loans held for sale (which consist of residential mortgages) are carried at fair value and had contractual unpaid principal balances totaling approximately $115.4 million and $24.3 million at December 31, 2012 and 2011, respectively.
[2] Derivative financial instruments are included in this category.
[3] The junior subordinated debentures had contractual unpaid principal obligations totaling $146.7 million and $157.0 million at December 31, 2012 and 2011, respectively.
[4] Excludes covered loans acquired in the FDIC-assisted transactions completed in 2010 and other purchased credit-impaired loans acquired in 2012.