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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Available For Sale Securities Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 13,677  
Amortized Cost, After one year through five years 169,784  
Amortized Cost, After five years through ten years 74,346  
Amortized Cost, After ten years 8,454  
Amortized Cost, Total 266,261  
Amortized Cost, Mortgage-backed securities 42,478  
Total, Amortized Cost 308,739  
Fair Value, One year or less 13,924  
Fair Value, After one year through five years 170,039  
Fair Value, After five years through ten years 72,885  
Fair Value, After ten years 8,062  
Fair Value, Total 264,910  
Fair Value, Mortgage-backed securities 42,815  
Total, Fair Value $ 307,725 $ 324,509