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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 11,669  
Amortized Cost, After one year through five years 85,477  
Amortized Cost, After five years through ten years 61,298  
Amortized Cost, After ten years 3,822  
Amortized Cost, Total 162,266  
Amortized Cost, Mortgage-backed securities 46,728  
Amortized Cost 208,994 $ 221,514
Fair Value, One year or less 11,710  
Fair Value, After one year through five years 85,266  
Fair Value, After five years through ten years 59,700  
Fair Value, After ten years 3,669  
Fair Value, Total 160,345  
Fair Value, Mortgage-backed securities 46,043  
Total, Fair Value $ 206,388 $ 218,527