Other services fees by major categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Component of Operating Other Cost and Expense [Line Items]
Debit card fees	$ 9,411	$ 13,795	$ 18,576	$ 26,720
Insurance Commissions And Fees	12,063	12,208	24,453	24,134
Fees And Commissions Credit Cards	14,268	11,792	26,827	22,368
Asset Management Fees	9,645	7,657	18,534	14,787
Servicing Fees Net	6,335	2,269	19,266	8,529
Fees And Commissions Fiduciary And Trust Activities	4,069	4,110	8,150	7,605
Processing fees	1,639	1,740	3,413	3,437
Other fees	4,597	4,736	8,847	9,379
Total other services fees	$ 62,027	$ 58,307	$ 128,066	$ 116,959