Loans (Activity Of Allowance For Loan Losses) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Beginning balance	$ 35,156	$ 34,576	$ 34,576
Provision for loan losses charged to expense	18,670	14,554	30,341
Loans charged off	(28,075)	(15,626)	(31,623)
Recoveries of loans previously charged off	447	1,019	1,862
Ending balance	$ 26,198	$ 34,523	$ 35,156