Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill And Net Other Intangible Assets) (Details) (USD $)	3 Months Ended			3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Goodwill [Member]	Dec. 31, 2011 Goodwill [Member]	Mar. 31, 2012 Core Deposit Premium [Member]	Mar. 31, 2012 Mortgage Servicing Rights [Member]
Goodwill [Line Items]
Balance, beginning			$ 125,585,000	$ 125,585,000	$ 6,970,000	$ 744,000
Amortization	(684,000)	(813,000)			(586,000)	(98,000)
Impairment reversal						40,000
Balance, ending			$ 125,585,000	$ 125,585,000	$ 6,384,000	$ 686,000

Aggregate amount of intangible asset amortization recognized as expense during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration