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Commitments and Off-Balance Sheet Risk - Summary of Contractual Amounts of Financial Instruments with Off-balance Sheet Risk (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk $ 377,135,000 $ 334,768,000
Commercial unused lines of credit [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk 225,732,000 222,237,000
Unused lines of credit secured by 1 - 4 family residential properties [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk 23,430,000 24,250,000
Credit card unused lines of credit [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk 8,555,000 8,512,000
Other consumer unused lines of credit [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk 6,379,000 4,613,000
Commitments to extend credit [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk 92,382,000 64,565,000
Standby letters of credit [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contractual amounts of financial instruments with off-balance sheet risk $ 20,657,000 $ 10,591,000