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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost, Due in one year or less $ 6,158  
Amortized Cost, Due after one year through five years 31,702  
Amortized Cost, Due after five years through ten years 30,831  
Amortized Cost, Due after ten years 68,679  
Amortized Cost, Mortgage-backed securities 81,898  
Amortized Cost, Equity securities 481  
Amortized Cost 219,749 $ 192,820
Fair value, Due in one year or less 6,158  
Fair value, Due after one year through five years 31,851  
Fair value, Due after five years through ten years 32,437  
Fair value, Due after ten years 70,125  
Fair value, Mortgage-backed securities 81,917  
Fair value, Equity securities 757  
Fair value, Total securities available for sale $ 223,245 $ 195,864