Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement Of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 25,127	$ 27,649
Income taxes paid	16,000	7,250
Transfers of loans to other real estate owned	8,780	8,139
Financing of other real estate owned sold	$ 262	$ 635