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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Amortized Cost and Fair Value Debt Securities [Abstract]    
Due within one year, Available for Sale Amortized Cost $ 0  
Due after one year through five years, Available for Sale Amortized Cost 9,871  
Due after five years through ten years, Available for Sale Amortized Cost 12,564  
Due after ten years, Available for Sale Amortized Cost 64,445  
Corporate equity securities, Available for Sale Amortized Cost 1  
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total 86,881 $ 105,851
Due within one year, Available for Sale Fair Value 0  
Due after one year through five years, Available for Sale Fair Value 10,014  
Due after five years through ten years, Available for Sale Fair Value 12,926  
Due after ten years, Available for Sale Fair Value 65,372  
Corporate equity securities, Available for Sale Fair Value 11  
Available for Sale Securities, Debt and Equity, Fair Value, Total 88,323 105,559 [1]
Due within one year, Held to Maturity Amortized Cost 0  
Due after one year through five years, Held to Maturity Amortized Cost 1,780  
Due after five years through ten years, Held to Maturity Amortized Cost 16,687  
Due after ten years, Held to Maturity Amortized Cost 36,796  
Corporate equity securities, Held to Maturity Amortized Cost 0  
Held to Maturity Amortized Cost, Total 55,263 66,519 [1]
Due within one year, Held to Maturity Fair Value 0  
Due after one year through five years, Held to Maturity Fair Value 1,818  
Due after five years through ten years, Held to Maturity Fair Value 17,144  
Due after ten years, Held to Maturity Fair Value 37,343  
Corporate equity securities, Held to Maturity Fair Value 0  
Held to Maturity Fair Value, Total $ 56,305 $ 66,438 [1]
[1] Derived from audited consolidated financial statements.