Derivative Financial Instruments (Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest Rate Swaps And Caps [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	$ (297)	$ 151
Mortgage Banking Derivatives [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	(670)	1,347
Call Options Written [Member] | Fees From Covered Call Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	1,639	3,123
Foreign Exchange Contract [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	$ (146)	$ 0