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Derivative Financial Instruments (Details 1) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
The Effect of Derivative Instruments on the Consolidated Statement of Earnings
Derivative Instruments, Gain Recognized in Income	$ 356	$ 1,045	$ 275
Interest Rate Swaps [Member] \| Other Income [Member]
The Effect of Derivative Instruments on the Consolidated Statement of Earnings
Derivative Instruments, Gain Recognized in Income	$ 356	$ 1,045	$ 275

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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