Fair Value Measurement Of Assets And Liabilities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Transfer of assets between level 1 and level 2	$ 0
Junior subordinated debentures, contractual unpaid principal obligations totaling, amount	20,600,000
Foreclosed assets measured at fair value upon initial recognition	15,900,000	20,000,000
Loss due to remeasurement of foreclosed assets at fair value	1,300,000
Charge-offs on initial recognition of foreclosed assets	3,900,000	8,100,000
Impaired collateral dependent loans, charge-offs	16,900,000	8,300,000
Collateral dependent impaired loans, recorded investment		54,400,000
Specific valuation allowance allocation		1,100,000
Reported net carrying value of impaired loans	53,300,000	66,900,000
Commercial And Construction Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Collateral dependent impaired loans, recorded investment	74,300,000
Specific valuation allowance allocation	7,400,000
Pooled Trust Preferred Securities [Member] | Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Number of available for sale securities	2
Loan Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Impairment charges/net recoveries	1,500,000	551,000
Contractual Unpaid Principal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Junior subordinated debentures, contractual unpaid principal obligations totaling, amount	$ 157,000,000	$ 157,000,000