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Securities - Debt Securities Available for Sale by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available For Sale Securities Debt Maturities [Abstract]    
Due after one year through five years, amortized cost $ 26,497  
Due after five years through ten years, amortized cost 99,042  
Due after ten years, amortized cost 58,249  
Mortgage-backed GSE securities: residential, amortized cost 87,917  
Total amortized cost 271,705 $ 348,099
Due after one year through five years, fair value 26,193  
Due after five years through ten years, fair value 98,193  
Due after ten years, fair value 59,054  
Mortgage-backed GSE securities: residential, fair value 87,121  
Total fair value $ 270,561 $ 343,284