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Securities - Debt Securities Available for Sale by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available For Sale Securities Debt Maturities [Abstract]    
Due after five years through ten years, amortized cost $ 199,440  
Due after ten years, amortized cost 32,908  
Mortgage-backed GSE securities: residential, amortized cost 129,155  
Total amortized cost 361,503 $ 506,429
Due after five years through ten years, fair value 197,097  
Due after ten years, fair value 32,593  
Mortgage-backed GSE securities: residential, fair value 127,980  
Total fair value $ 357,670 $ 499,790