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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]    
Amortized Cost, Due in one year or less $ 13,831  
Amortized Cost, Due after one year through five years 22,569  
Amortized Cost, Due after five years through ten years 31,666  
Amortized Cost, Due after ten years 77,677  
Amortized Cost, Mortgage-backed securities 87,832  
Amortized Cost 233,575  
Fair value, Due in one year or less 13,776  
Fair value, Due after one year through five years 22,474  
Fair value, Due after five years through ten years 32,835  
Fair value, Due after ten years 78,375  
Fair value, Mortgage-backed securities 86,582  
Fair value, Total securities available for sale $ 234,042 $ 230,230