Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Difference in appraised value of underlying collateral with total fair value	$ 9,074,000
Impaired loans, measured by using the fair value of collateral, carrying amount	98,004,000
Impaired loans, measured by using the fair value of collateral, valuation allowance	6,522,000
Additional provision for loan and lease losses.	$ 541,000
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%