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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
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 23,719  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 25,167  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 11,349  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 6,613  
Mortgage backed securities and collateralized mortgage obligations, Amortized cost 131,923  
Amortized Cost 198,771 219,923
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 23,772  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 25,881  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 12,425  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 7,103  
Mortgage backed securities and collateralized mortgage obligations, Fair value 134,582  
Fair Value $ 203,763 $ 226,012