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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Amortized Cost and Fair Value Debt Securities [Abstract]    
Due within one year, Available for Sale Amortized Cost $ 391  
Due after one year through five years, Available for Sale Amortized Cost 7,806  
Due after five years through ten years, Available for Sale Amortized Cost 20,377  
Due after ten years, Available for Sale Amortized Cost 80,221  
Corporate equity securities, Available for Sale Amortized Cost 1  
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total 108,796 $ 83,494
Due within one year, Available for Sale Fair Value 393  
Due after one year through five years, Available for Sale Fair Value 7,853  
Due after five years through ten years, Available for Sale Fair Value 20,499  
Due after ten years, Available for Sale Fair Value 80,413  
Corporate equity securities, Available for Sale Fair Value 8  
Available for Sale Securities, Debt and Equity, Fair Value, Total 109,166 83,292
Due within one year, Held to Maturity Amortized Cost 0  
Due after one year through five years, Held to Maturity Amortized Cost 633  
Due after five years through ten years, Held to Maturity Amortized Cost 15,215  
Due after ten years, Held to Maturity Amortized Cost 38,428  
Corporate equity securities, Held to Maturity Amortized Cost 0  
Held to Maturity Amortized Cost, Total 54,276  
Due within one year, Held to Maturity Fair Value 0  
Due after one year through five years, Held to Maturity Fair Value 631  
Due after five years through ten years, Held to Maturity Fair Value 15,245  
Due after ten years, Held to Maturity Fair Value 38,427  
Corporate equity securities, Held to Maturity Fair Value 0  
Held to Maturity Fair Value, Total $ 54,303 $ 0