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Securities Available for Sale - Schedule of Amortized Cost and Fair Values of Securities Available for Sale by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 365  
Due after one year through five years, Amortized Cost 15  
Due after five years through ten years, Amortized Cost 16,953  
Due after ten years, Amortized Cost 59,541  
Mortgage-backed securities and collateralized mortgage obligations, Amortized Cost 325,557  
Amortized Cost 402,431  
Equity securities, Amortized Cost 50  
Available for sale securities, Total 402,481 414,348
Due in one year or less, Fair Value 366  
Due after one year through five years, Fair Value 15  
Due after five years through ten years, Fair Value 16,854  
Due after ten years, Fair Value 58,955  
Mortgage-backed securities and collateralized mortgage obligations, Fair Value 326,310  
Available for sale securities, debt securities, Fair Value 402,500  
Equity securities, Fair Value 63  
Securities available for sale, Total $ 402,563 $ 406,943