Fair Value Measurements (Narrative) (Details) (USD $)			9 Months Ended
	Sep. 30, 2012 Impaired_Loans	Dec. 31, 2011 Impaired_Loans	Sep. 30, 2012 Inventory and Equipment [Member]	Sep. 30, 2012 Accounts Receivable [Member]	Sep. 30, 2012 Foreclosed [Member]	Sep. 30, 2012 Minimum [Member] Real Estate [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Maximum [Member] Real Estate [Member]	Sep. 30, 2012 Fair value measurements, nonrecurring [Member]	Dec. 31, 2011 Fair value measurements, nonrecurring [Member]	Sep. 30, 2012 Fair value inputs, Level 3 [Member] Fair value measurements, nonrecurring [Member]	Dec. 31, 2011 Fair value inputs, Level 3 [Member] Fair value measurements, nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, collateral, discount rate			50.00%	20.00%	15.00%	15.00%		35.00%
Number of impaired loans	8	4
Impaired loans with specific allocation									$ 9,296,000	$ 9,875,000	$ 9,296,000	$ 9,875,000
Allowance related to impaired loans	8,358,000	3,630,000							8,400,000	3,600,000
Impaired loans net of partial charge-offs									4,937,000	1,151,000	4,937,000	1,151,000
Impaired loans, charge-offs		10,100,000							2,800,000
Foreclosed assets, carrying value									104,000	3,041,000	104,000	3,041,000
Valuation allowances											$ 70,000	$ 1,800,000
Cash and cash equivalents, maximum original maturities							90 days