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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 7,032  
Amortized Cost, After one year through five years 164,119  
Amortized Cost, After five years through ten years 37,428  
Amortized Cost, After ten years 6,884  
Amortized Cost, Total 215,463  
Amortized Cost, Mortgage-backed securities 27,593  
Amortized Cost 243,056 $ 247,819
Fair Value, One year or less 7,056  
Fair Value, After one year through five years 164,805  
Fair Value, After five years through ten years 37,840  
Fair Value, After ten years 7,057  
Fair Value, Total 216,758  
Fair Value, Mortgage-backed securities 28,028  
Total, Fair Value $ 244,786 $ 248,492