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Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Amortized cost    
Due in one year or less $ 0  
Due after one year through five years 9,310  
Due after five years through ten years 30,540  
Due after ten years 30,661  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total 70,511  
Mortgage-backed securities and CMO 40,091  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total 110,602  
Fair Value    
Due in one year or less 0  
Due after one year through five years 9,305  
Due after five years through ten years 30,485  
Due after ten years 30,177  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Total 69,967  
Mortgage-backed securities and CMO 39,869  
Available-for-sale Securities, Debt Securities, Total 109,836  
Amortized cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years     
Due after ten years 0  
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total 0  
Mortgage-backed securities and CMO 10  
Securities held to maturity, Amortized Cost 10 12
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years     
Due after ten years 0  
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Total 0  
Mortgage-backed securities and CMO 10  
Securities held to maturity, Fair Value $ 10 $ 12