Goodwill And Intangible Assets (Schedule Of Activity In Goodwill And Core Deposit Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Goodwill, Beginning Balance	$ 72,334
Goodwill, Ending Balance	72,334
Core Deposit Intangibles, Beginning Balance	2,509
Core Deposit Intangibles, Amortization	1,754
Core Deposit Intangibles, Ending Balance	755
Total Goodwill and Core Deposit Intangibles, Beginning Balance	74,843
Amortization of intangibles	1,754	669
Total Goodwill and Core Deposit Intangibles, Ending Balance	73,089
Expected amortization expense per quarter for remainder of fiscal year	$ 139,000
Minimum [Member]
Core deposit intangibles, useful life	6 years