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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Available For Sale Securities Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 18,997  
Amortized Cost, After one year through five years 161,574  
Amortized Cost, After five years through ten years 62,614  
Amortized Cost, After ten years 8,452  
Amortized Cost, Total 251,637  
Amortized Cost, Mortgage-backed securities 32,721  
Total, Amortized Cost 284,358  
Fair Value, One year or less 19,266  
Fair Value, After one year through five years 161,777  
Fair Value, After five years through ten years 62,281  
Fair Value, After ten years 8,122  
Fair Value, Total 251,446  
Fair Value, Mortgage-backed securities 33,182  
Total, Fair Value $ 284,628 $ 324,509