Fair Value Measurements (Narrative) (Details) (USD $)			6 Months Ended
	Jun. 30, 2012 Impaired_Loans	Dec. 31, 2011 Impaired_Loans	Jun. 30, 2012 Inventory and Equipment [Member]	Jun. 30, 2012 Accounts Receivable [Member]	Jun. 30, 2012 Foreclosed [Member]	Jun. 30, 2012 Minimum [Member] Real Estate [Member]	Jun. 30, 2012 Maximum [Member]	Jun. 30, 2012 Maximum [Member] Real Estate [Member]	Jun. 30, 2012 Fair value measurements, nonrecurring [Member]	Dec. 31, 2011 Fair value measurements, nonrecurring [Member]	Dec. 31, 2011 Fair value inputs, Level 3 [Member] Foreclosed_Assets	Jun. 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	9	4
Impaired loans with specific allocation									$ 14,781,000	$ 9,875,000		$ 14,781,000	$ 9,875,000
Allowance related to impaired loans	(8,320,000)	(3,630,000)							(8,300,000)	(3,600,000)
Impaired loans net of partial charge-offs									817,000	1,151,000		817,000	1,151,000
Impaired loans, charge-offs	429,000	10,100,000
Number of foreclosed assets with valuation allowances recorded subsequent to initial foreclosure											2
Foreclosed assets, carrying value										3,041,000			3,041,000
Valuation allowances													$ 1,800,000
Cash and cash equivalents, maximum original maturities							90 days