Goodwill And Intangible Assets (Schedule Of Activity In Goodwill And Core Deposit Intangibles) (Details) (USD $)	3 Months Ended			9 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Goodwill And Intangible Assets [Abstract]
Goodwill, Beginning Balance	$ 72,334,000			$ 72,334,000
Goodwill, Ending Balance		72,334,000		72,334,000
Core Deposit Intangibles, Beginning Balance	4,036,000			6,043,000
Core Deposit Intangibles, Amortization	669,000			2,007,000
Core Deposit Intangibles, Ending Balance		4,036,000		4,036,000
Total Goodwill and Core Deposit Intangibles, Beginning Balance	76,370,000			78,377,000
Amortization of intangibles		669,000	822,000	2,007,000	2,600,000
Total Goodwill and Core Deposit Intangibles, Ending Balance		$ 76,370,000		$ 76,370,000
Core deposit intangibles, useful life, minimum				6
Core deposit intangibles, useful life, maximum				10