Acquisitions (Schedule Of Components of Estimated Fair Value Of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011
Core Deposit [Member]
Estimated Fair Value	$ 8.2
Estimated Useful Lives (Years)	10
Customer Trust Relationships [Member]
Estimated Fair Value	$ 2.3
Estimated Useful Lives (Years)	12

The useful life of all finite-lived intangible assets. This may be stated as a fixed number (for example, 10 years) if all assets have the same useful life, or it can be stated in a range (for example, six to eight years) if there is a range of useful lives in the asset group.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 12, 13, 14

Name:	us-gaap_FiniteLivedIntangibleAssetsUsefulLife
Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration