Other services fees by major categories (Detail) (Segment, Continuing Operations [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment, Continuing Operations [Member]
Component of Operating Other Cost and Expense [Line Items]
Debit card fees	$ 10,673	$ 10,667	$ 32,217	$ 31,127
Insurance Commissions And Fees	12,322	12,409	36,447	35,566
Fees And Commissions Credit Cards	17,078	16,734	50,146	48,553
Asset Management Fees	6,605	8,981	20,518	27,941
Fees And Commissions Fiduciary And Trust Activities	4,711	4,148	13,740	12,760
Other fees	3,450	4,102	11,057	13,317
Total other services fees	$ 54,839	$ 57,041	$ 164,125	$ 169,264