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Securities - Debt Securities Available for Sale by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Available For Sale Securities Debt Maturities [Abstract]    
Due after five years through ten years, amortized cost $ 173,563  
Due after ten years, amortized cost 64,157  
Mortgage-backed GSE securities: residential, amortized cost 105,963  
Total amortized cost 343,683 $ 361,503
Due after five years through ten years, fair value 180,115  
Due after ten years, fair value 66,377  
Mortgage-backed GSE securities: residential, fair value 107,977  
Total fair value $ 354,469 $ 357,670