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Fair Values Of Financial Instruments (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total available for sale securities $ 625,625 $ 696,518
Derivative financial assets 2,367 3,817
U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total available for sale securities 337,522 303,547
State And Political Subdivisions [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total available for sale securities 80,428 98,848
Asset-Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total available for sale securities 11,709  
Trust Preferred Collateralized Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total available for sale securities 40,613 42,369
Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial liabilities   5,050
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 619,239 692,559
Available for sale equity securities 6,386 3,959
Total available for sale securities 625,625 696,518
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 337,522 303,547
Fair Value, Measurements, Recurring [Member] | State And Political Subdivisions [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 80,428 98,848
Fair Value, Measurements, Recurring [Member] | Agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 106,510 193,404
Fair Value, Measurements, Recurring [Member] | Non-agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 25,045 37,541
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 11,709  
Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 40,613 42,369
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 12,129 11,760
Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 5,283 5,090
Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 5,382 2,243
Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 55 860
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 949 856
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 2,367 3,817
Derivative financial liabilities 4,281  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 0 0
Derivative financial liabilities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial liabilities   0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 499 792
Available for sale equity securities 3,308 3,639
Total available for sale securities 3,807 4,431
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | State And Political Subdivisions [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Non-agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 364
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 499 428
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 2,304 1,923
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 55 860
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 949 856
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 0 0
Derivative financial liabilities 0  
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 2,367 3,817
Derivative financial liabilities 4,281 5,050
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial liabilities   5,050
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 578,127 649,398
Available for sale equity securities 3,078 320
Total available for sale securities 581,205 649,718
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 337,522 303,547
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | State And Political Subdivisions [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 80,428 98,848
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 106,510 193,404
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Non-agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 25,045 37,177
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 11,709  
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 11,630 11,332
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 5,283 5,090
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 3,078 320
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 0 0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 0 0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 2,367 3,817
Derivative financial liabilities 4,281  
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 0 0
Derivative financial liabilities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial liabilities   0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 40,613 42,369
Available for sale equity securities 0 0
Total available for sale securities 40,613 42,369
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities And Obligations Of U.S. Government Corporations And Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | State And Political Subdivisions [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Non-agency [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0  
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 40,613 42,369
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale equity securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial assets 0 0
Derivative financial liabilities $ 0