Other services fees by major categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Component of Operating Other Cost and Expense [Line Items]
Debit card fees	$ 10,875	$ 10,397
Insurance Commissions And Fees	12,296	12,073
Fees And Commissions Credit Cards	16,221	15,685
Asset Management Fees	6,457	8,717
Fees And Commissions Fiduciary And Trust Activities	4,463	4,458
Processing fees	0	0
Other fees	3,731	4,763
Total other services fees	$ 54,043	$ 56,093