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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 21,660  
Amortized Cost, After one year through five years 84,900  
Amortized Cost, After five years through ten years 50,406  
Amortized Cost, After ten years 2,847  
Amortized Cost, Total 159,813  
Amortized Cost, Mortgage-backed securities 38,283  
Amortized Cost 198,096 $ 199,165
Fair Value, One year or less 21,626  
Fair Value, After one year through five years 83,471  
Fair Value, After five years through ten years 48,228  
Fair Value, After ten years 2,672  
Fair Value, Total 155,997  
Fair Value, Mortgage-backed securities 36,862  
Total, Fair Value $ 192,859 $ 196,398