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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Available For Sale Securities Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 8,774  
Amortized Cost, After one year through five years 173,008  
Amortized Cost, After five years through ten years 89,624  
Amortized Cost, After ten years 8,456  
Amortized Cost, Total 279,862  
Amortized Cost, Mortgage-backed securities 44,638  
Total, Amortized Cost 324,500  
Fair Value, One year or less 8,892  
Fair Value, After one year through five years 174,132  
Fair Value, After five years through ten years 87,168  
Fair Value, After ten years 9,525  
Fair Value, Total 324,509 355,905
Fair Value, Mortgage-backed securities 44,792  
Total, Fair Value $ 324,509