Premises And Equipment (Summary Of Premises And Equipment) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 76,305	$ 79,327
Accumulated depreciation	38,048	43,363
Property, plant and equipment, net	38,257	35,964
Premises [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,362	1,562
Buildings [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,020	6,708
Leasehold Improvements [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,011	32,804
Furniture And Equipment [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,912	$ 38,253