Loans And Allowance For Loan Losses (Summary Of Non-Performing Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 66,004	$ 94,335
Troubled debt restructurings	14,876	11,893
Total non-performing loans	80,880	106,228
Other real estate owned (OREO)	35,257	34,719
Total non-performing loans and OREO	116,137	140,947
Non-performing investments	2,809	8,972
Total non-performing assets	$ 118,946	$ 149,919
Non-performing loans as a percent of total loans	0.99%	1.55%
Non-performing loans + OREO as a percent of total loans + OREO	1.42%	2.05%
Non-performing assets as a percent of total assets	0.99%	1.53%