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Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities $ 519,820 $ 534,358
Derivatives 84 144
Derivative Liabilities 41 16
Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 519,820 534,358
Deferred compensation assets 4,200 3,625
Derivatives 84  
Deferred compensation liabilities 4,200 3,625
Recurring | US Treasury Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 9,013  
Recurring | Municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 144,280 159,217
Recurring | Single Issue Trust Preferred Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 46,234 44,646
Recurring | Corporate securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 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 300,386 315,897
Recurring | Non Agency Alt Residential Mbs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 9,789  
Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 5,247 3,531
Recurring | IRLCs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   144
Derivative Liabilities 41 16
Recurring | Interest Rate Swap Agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 43  
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   11,067
Recurring | Forward Sale Loan Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 41  
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 251 3,511
Level 1 | Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 251 3,511
Deferred compensation assets 4,200 3,625
Deferred compensation liabilities 4,200 3,625
Level 1 | Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 251 3,511
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 519,569 530,847
Derivatives 84 144
Derivative Liabilities 41 16
Level 2 | Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 519,569 530,847
Derivatives 84  
Level 2 | Recurring | US Treasury Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 9,013  
Level 2 | Recurring | Municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 144,280 159,217
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 46,234 44,646
Level 2 | Recurring | Corporate securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 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 300,386 315,897
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 9,789  
Level 2 | Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 4,996 20
Level 2 | Recurring | IRLCs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   144
Derivative Liabilities 41 16
Level 2 | Recurring | Interest Rate Swap Agreement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 43  
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   11,067
Level 2 | Recurring | Forward Sale Loan Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives $ 41