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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 13,812  
Amortized Cost, After one year through five years 152,266  
Amortized Cost, After five years through ten years 35,674  
Amortized Cost, After ten years 6,884  
Amortized Cost, Total 208,636  
Amortized Cost, Mortgage-backed securities 26,157  
Amortized Cost 234,793 $ 247,819
Fair Value, One year or less 13,862  
Fair Value, After one year through five years 151,894  
Fair Value, After five years through ten years 35,953  
Fair Value, After ten years 7,082  
Fair Value, Total 208,791  
Fair Value, Mortgage-backed securities 26,324  
Total, Fair Value $ 235,115 $ 248,492