Cash Flow Information - Summary of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 67,296	$ 47,805	$ 43,057
Income taxes paid	60,000	61,500	27,000
Transfers of loans to other real estate owned	14,592	9,628	16,535
Transfers of other real estate owned to loans	$ 441	$ 372	$ 390