Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Amortization	$ (3,000)	$ (3,500)	$ (4,000)
Goodwill [Member]
Balance, ending	125,585	125,585	125,585
Core Deposit Premium [Member]
Balance, beginning	9,612	12,754
Amortization	(2,642)	(3,142)
Balance, ending	6,970	9,612
Mortgage Servicing Rights [Member]
Balance, beginning	1,325	1,579
Originations	15	184
Amortization	(354)	(366)
Impairment	(242)	(72)
Balance, ending	$ 744	$ 1,325