Fair Value Measurements (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measured by using the fair value of collateral, carrying amount	$ 101,327,000
Impaired loans, measured by using the fair value of collateral, valuation allowance	7,309,000
Impaired loans, measured by using the fair value of collateral, additional specific reserves	$ 2,275,000
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of discount on collateral for estimated cost of sales	10.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of discount on collateral for estimated cost of sales	7.00%