Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 23,621	$ 21,366
Income taxes paid	21,000	1,000
Transfers of loans to other real estate owned	4,744	6,660
Financing of other real estate owned sold	$ 222	$ 259