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Securities - Amortized Cost and Fair Value of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Amortized Cost and Fair Value Debt Securities [Abstract]    
Due within one year, Available for Sale Amortized Cost $ 1,075  
Due after one year through five years, Available for Sale Amortized Cost 14,229  
Due after five years through ten years, Available for Sale Amortized Cost 12,185  
Due after ten years, Available for Sale Amortized Cost 65,144  
Corporate equity securities, Available for Sale Amortized Cost 1  
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total 92,634 $ 96,106
Due within one year, Available for Sale Fair Value 1,077  
Due after one year through five years, Available for Sale Fair Value 14,244  
Due after five years through ten years, Available for Sale Fair Value 12,109  
Due after ten years, Available for Sale Fair Value 64,466  
Corporate equity securities, Available for Sale Fair Value 11  
Available for Sale Securities, Debt and Equity, Fair Value, Total 91,907 94,802 [1]
Due within one year, Held to Maturity Amortized Cost 0  
Due after one year through five years, Held to Maturity Amortized Cost 1,773  
Due after five years through ten years, Held to Maturity Amortized Cost 18,806  
Due after ten years, Held to Maturity Amortized Cost 31,420  
Corporate equity securities, Held to Maturity Amortized Cost 0  
Held to Maturity Amortized Cost, Total 51,999 53,398 [1]
Due within one year, Held to Maturity Fair Value 0  
Due after one year through five years, Held to Maturity Fair Value 1,786  
Due after five years through ten years, Held to Maturity Fair Value 18,770  
Due after ten years, Held to Maturity Fair Value 31,052  
Corporate equity securities, Held to Maturity Fair Value 0  
Held to Maturity Fair Value, Total $ 51,608 $ 52,709 [1]
[1] Derived from audited consolidated financial statements.