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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 21,644  
Amortized Cost, After one year through five years 84,514  
Amortized Cost, After five years through ten years 49,908  
Amortized Cost, After ten years 2,863  
Amortized Cost, Total 158,929  
Amortized Cost, Mortgage-backed securities 40,236  
Amortized Cost 199,165 $ 221,514
Fair Value, One year or less 21,618  
Fair Value, After one year through five years 83,685  
Fair Value, After five years through ten years 48,810  
Fair Value, After ten years 2,775  
Fair Value, Total 156,888  
Fair Value, Mortgage-backed securities 39,510  
Total, Fair Value $ 196,398 $ 218,527