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Securities - Amortized Cost and Fair Value of the Debt Securities Portfolio are Shown by Expected Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Securities    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 24,281  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 25,538  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 9,808  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 17,330  
Mortgage backed securities and collateralized mortgage obligations, Amortized cost 152,062  
Amortized Cost 229,019 219,923
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 24,389  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 26,251  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 10,786  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 17,867  
Mortgage backed securities and collateralized mortgage obligations, Fair value 156,041  
Fair Value $ 235,334 $ 226,012