Fair Value of Financial Instruments (Narrative, Assets Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $)			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Nonrecurring Basis	Dec. 31, 2012 Nonrecurring Basis Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, aggregate outstanding principal balance	$ 24,125,000	$ 56,013,000		$ 11,200,000
Impaired loans, fair value				6,700,000
Losses on impaired loans charged through allowance for loan losses			4,500,000
Recorded losses for other real estate owned