Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 31,788	$ 23,621
Income taxes paid	35,500	21,000
Transfers of loans to other real estate owned	10,389	4,744
Financing of other real estate owned sold	$ 141	$ 222