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Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities $ 376,191 $ 326,117  
Derivatives assets 20 5 $ 31
Derivative Liabilities 192 214 $ 231
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 376,191 326,117  
Fair value loans 5,099 3,406  
Deferred compensation assets 3,539 3,380  
Derivatives assets 40 5  
Deferred compensation liabilities 3,539 3,380  
Derivative Liabilities 212 214  
Recurring | U.S. Agency securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 32,127    
Recurring | Municipal securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 132,999 138,915  
Recurring | Single Issue Trust Preferred Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 48,345 46,137  
Recurring | Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 60,708 5,109  
Recurring | Certificates of deposit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 5,000    
Recurring | Agency Mortgage Backed Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 96,793 102,119  
Recurring | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 219 239  
Recurring | Forward Sale Loan Commitments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets 20    
Derivative Liabilities   5  
Recurring | US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities   33,598  
IRLCs | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets   5  
Derivative Liabilities 20    
Interest Rate Swaps Agreement | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities 172 209  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 201 221  
Deferred compensation assets 3,539 3,380  
Deferred compensation liabilities 3,539 3,380  
Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 201 221  
Deferred compensation assets 3,539 3,380  
Deferred compensation liabilities 3,539 3,380  
Level 1 | Recurring | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 201 221  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 375,990 325,896  
Fair value loans 5,271 3,406  
Derivatives assets 20 5  
Derivative Liabilities 192 214  
Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 375,990 325,896  
Fair value loans 5,099 3,406  
Derivatives assets 40 5  
Derivative Liabilities 212 214  
Level 2 | Recurring | U.S. Agency securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 32,127    
Level 2 | Recurring | Municipal securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 132,999 138,915  
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 48,345 46,137  
Level 2 | Recurring | Corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 60,708 5,109  
Level 2 | Recurring | Certificates of deposit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 5,000    
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 96,793 102,119  
Level 2 | Recurring | Equity Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 18 18  
Level 2 | Recurring | Forward Sale Loan Commitments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets 20    
Derivative Liabilities   5  
Level 2 | Recurring | US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities   33,598  
Level 2 | IRLCs | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives assets   5  
Derivative Liabilities 20    
Level 2 | Interest Rate Swaps Agreement | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities $ 172 $ 209