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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 7,679  
Amortized Cost, After one year through five years 152,418  
Amortized Cost, After five years through ten years 32,591  
Amortized Cost, After ten years 6,884  
Amortized Cost, Total 199,572  
Amortized Cost, Mortgage-backed securities 24,787  
Amortized Cost 224,359 $ 234,793
Fair Value, One year or less 7,722  
Fair Value, After one year through five years 153,383  
Fair Value, After five years through ten years 33,145  
Fair Value, After ten years 7,115  
Fair Value, Total 201,365  
Fair Value, Mortgage-backed securities 25,147  
Total, Fair Value $ 226,512 $ 235,115