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Derivatives (Schedule Of Interest Rate Swaps) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Estimated fair value of liability	$ 9,800	$ 9,492	$ 11,309
Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member]
Notional amount for all periods	115,000	115,000	115,000
Estimated fair value of liability		2,873	5,384
Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member]
Notional amount for all periods	115,000	115,000	115,000
Estimated fair value of liability	$ 9,800	$ 6,619	$ 5,925

X

- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 17

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ Details

Name:	us-gaap_NotionalAmountOfInterestRateDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant