Fair Value Of Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from sale of held-to-maturity securities	$ 100,000,000
Marketable securities in an unrealized gain (loss) position	(12,124,000)	4,884,000
Discount rate used in determining the present value of the estimated future cash flows from bonds	15.00%
Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities in an unrealized gain (loss) position	7,200,000
Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities in an unrealized gain (loss) position	(9,500,000)
Under Commitment To Sell [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale	77,500,000	56,900,000
Not Under Commitment To Sell [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale	$ 800,000	$ 8,200,000