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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 7,761  
Amortized Cost, After one year through five years 79,151  
Amortized Cost, After five years through ten years 60,908  
Amortized Cost, After ten years 3,814  
Amortized Cost, Total 151,634  
Amortized Cost, Mortgage-backed securities 44,527  
Amortized Cost 196,161 $ 221,514
Fair Value, One year or less 7,759  
Fair Value, After one year through five years 79,161  
Fair Value, After five years through ten years 60,635  
Fair Value, After ten years 3,793  
Fair Value, Total 151,348  
Fair Value, Mortgage-backed securities 44,234  
Total, Fair Value $ 195,582 $ 218,527