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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 20,590  
Amortized Cost, After one year through five years 146,785  
Amortized Cost, After five years through ten years 46,793  
Amortized Cost, After ten years 8,217  
Amortized Cost, Total 222,385  
Amortized Cost, Mortgage-backed securities 30,773  
Total, Amortized Cost 253,158  
Fair Value, One year or less 20,827  
Fair Value, After one year through five years 146,351  
Fair Value, After five years through ten years 46,842  
Fair Value, After ten years 7,966  
Fair Value, Total 221,986  
Fair Value, Mortgage-backed securities 31,133  
Total, Fair Value $ 253,119 $ 324,509