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Securities - Debt Securities Available for Sale by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available For Sale Securities Debt Maturities [Abstract]    
Due after five years through ten years, amortized cost $ 183,271  
Due after ten years, amortized cost 58,848  
Mortgage-backed GSE securities: residential, amortized cost 97,045  
Total amortized cost 339,164 $ 348,099
Due after five years through ten years, fair value 182,068  
Due after ten years, fair value 57,449  
Mortgage-backed GSE securities: residential, fair value 96,317  
Total fair value $ 335,834 $ 343,284