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Loans - Change in Accretable Yield for PCI (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Change in accretable yield:    
Balance at beginning of period $ 14,159 $ 18,233
Accretion to interest income (6,323) (5,854)
Reclassification (to) from nonaccretable difference 5,419 1,780
Balance at end of period $ 13,255 $ 14,159