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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 9,014  
Amortized Cost, After one year through five years 88,228  
Amortized Cost, After five years through ten years 50,404  
Amortized Cost, After ten years 3,806  
Amortized Cost, Total 151,452  
Amortized Cost, Mortgage-backed securities 42,409  
Amortized Cost 193,861 $ 221,514
Fair Value, One year or less 9,017  
Fair Value, After one year through five years 88,088  
Fair Value, After five years through ten years 49,979  
Fair Value, After ten years 3,737  
Fair Value, Total 150,821  
Fair Value, Mortgage-backed securities 41,990  
Total, Fair Value $ 192,811 $ 218,527