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Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities $ 398,425 $ 519,820  
Derivatives assets 31 84 17
Derivative Liabilities 231 41 163
Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 398,425 519,820  
Fair value loans 7,928    
Deferred compensation assets 3,317 4,200  
Derivatives assets 31 84  
Deferred compensation liabilities 3,317 4,200  
Derivative Liabilities 231 41  
Recurring | US Treasury Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 9,472 9,013  
Recurring | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 144,135 144,280  
Recurring | Single Issue Trust Preferred Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 48,310 46,234  
Recurring | Corporate securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 5,058 4,871  
Recurring | Agency Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 180,390 300,386  
Recurring | Non Agency Alt Residential Mbs
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 10,008    
Recurring | Equity Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 1,052 5,247  
Recurring | Forward Sale Loan Commitments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets 31 41  
Recurring | Non Agency Residential Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities   9,789  
Interest Rate Swaps Agreement | Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets   43  
Derivative Liabilities 200    
IRLCs | Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities 31 41  
Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 1,034 251  
Level 1 | Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 1,034 251  
Deferred compensation assets 3,317 4,200  
Deferred compensation liabilities 3,317 4,200  
Level 1 | Recurring | Equity Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 1,034 251  
Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 397,391 519,569  
Fair value loans 7,928    
Derivatives assets 31 84  
Derivative Liabilities 231 41  
Level 2 | Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 397,391 519,569  
Fair value loans 7,928    
Derivatives assets 31 84  
Derivative Liabilities 231 41  
Level 2 | Recurring | US Treasury Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 9,472 9,013  
Level 2 | Recurring | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 144,135 144,280  
Level 2 | Recurring | Single Issue Trust Preferred Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 48,310 46,234  
Level 2 | Recurring | Corporate securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 5,058 4,871  
Level 2 | Recurring | Agency Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 180,390 300,386  
Level 2 | Recurring | Non Agency Alt Residential Mbs
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 10,008    
Level 2 | Recurring | Equity Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 18 4,996  
Level 2 | Recurring | Forward Sale Loan Commitments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets 31 41  
Level 2 | Recurring | Non Agency Residential Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities   9,789  
Level 2 | Interest Rate Swaps Agreement | Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets   43  
Derivative Liabilities 200    
Level 2 | IRLCs | Recurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities $ 31 $ 41