Deposits - Scheduled Maturities of Certificates of Deposit (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Within one year	$ 499,221	$ 568,462
One to three years	132,507	152,317
Three to five years	106,943	100,080
Five years and thereafter	1,050	4,830
Certificates of deposit	$ 739,721	$ 825,689