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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 19,158  
Amortized Cost, After one year through five years 81,888  
Amortized Cost, After five years through ten years 67,483  
Amortized Cost, After ten years 3,830  
Amortized Cost, Total 172,359  
Amortized Cost, Mortgage-backed securities 49,155  
Amortized Cost 221,514 $ 234,793
Fair Value, One year or less 19,231  
Fair Value, After one year through five years 81,590  
Fair Value, After five years through ten years 65,583  
Fair Value, After ten years 3,662  
Fair Value, Total 170,066  
Fair Value, Mortgage-backed securities 48,461  
Total, Fair Value $ 218,527 $ 235,115