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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

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

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- 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