Loans and Leases and the Allowance for Loan and Lease Losses (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Related party loans
Related party loans balance	$ 6,700,000	$ 10,400,000
Impaired Loans with No Related Allowance Recorded:
Impaired Loans Information:
Recorded Investment	8,316,000	4,941,000
Unpaid Principal Balance	16,166,000	9,821,000
Average Recorded Investment	6,327,000	9,287,000
Impaired Loans with No Related Allowance Recorded: | Commercial
Impaired Loans Information:
Recorded Investment	8,316,000	4,941,000
Unpaid Principal Balance	16,166,000	9,821,000
Average Recorded Investment	6,327,000	9,287,000
Impaired Loans with No Related Allowance Recorded: | Commercial and Industrial
Impaired Loans Information:
Recorded Investment	6,176,000	1,564,000
Unpaid Principal Balance	13,526,000	5,414,000
Average Recorded Investment	3,367,000	1,829,000
Impaired Loans with No Related Allowance Recorded: | Commercial Mortgage
Impaired Loans Information:
Recorded Investment	2,140,000	3,377,000
Unpaid Principal Balance	2,640,000	4,407,000
Average Recorded Investment	2,845,000	2,758,000
Impaired Loans with No Related Allowance Recorded: | Construction
Impaired Loans Information:
Average Recorded Investment	115,000	4,700,000
Impaired Loans with an Allowance Recorded:
Impaired Loans Information:
Recorded Investment	39,284,000	33,092,000
Unpaid Principal Balance	44,164,000	37,046,000
Related Allowance for Loan Losses	5,451,000	4,170,000
Average Recorded Investment	35,324,000	24,299,000
Interest Income Recognized	1,123,000	826,000
Impaired Loans with an Allowance Recorded: | Commercial
Impaired Loans Information:
Recorded Investment	6,819,000	5,886,000
Unpaid Principal Balance	6,819,000	6,189,000
Related Allowance for Loan Losses	1,195,000	1,091,000
Average Recorded Investment	4,801,000	7,791,000
Interest Income Recognized	164,000	267,000
Impaired Loans with an Allowance Recorded: | Commercial and Industrial
Impaired Loans Information:
Recorded Investment	4,447,000	5,156,000
Unpaid Principal Balance	4,447,000	5,156,000
Related Allowance for Loan Losses	846,000	927,000
Average Recorded Investment	3,988,000	6,548,000
Interest Income Recognized	150,000	250,000
Impaired Loans with an Allowance Recorded: | Commercial Mortgage
Impaired Loans Information:
Recorded Investment	2,372,000	442,000
Unpaid Principal Balance	2,372,000	745,000
Related Allowance for Loan Losses	349,000	99,000
Average Recorded Investment	755,000	520,000
Interest Income Recognized	14,000	17,000
Impaired Loans with an Allowance Recorded: | Construction
Impaired Loans Information:
Recorded Investment		288,000
Unpaid Principal Balance		288,000
Related Allowance for Loan Losses		65,000
Average Recorded Investment	58,000	723,000
Impaired Loans with an Allowance Recorded: | Consumer
Impaired Loans Information:
Recorded Investment	32,465,000	27,206,000
Unpaid Principal Balance	37,345,000	30,857,000
Related Allowance for Loan Losses	4,256,000	3,079,000
Average Recorded Investment	30,523,000	16,508,000
Interest Income Recognized	959,000	559,000
Impaired Loans with an Allowance Recorded: | Residential Mortgage
Impaired Loans Information:
Recorded Investment	25,726,000	21,058,000
Unpaid Principal Balance	30,606,000	24,709,000
Related Allowance for Loan Losses	4,138,000	2,919,000
Average Recorded Investment	24,075,000	11,293,000
Interest Income Recognized	333,000	156,000
Impaired Loans with an Allowance Recorded: | Home Equity
Impaired Loans Information:
Recorded Investment	21,000	21,000
Unpaid Principal Balance	21,000	21,000
Related Allowance for Loan Losses	1,000	1,000
Average Recorded Investment	21,000	4,000
Impaired Loans with an Allowance Recorded: | Automobile
Impaired Loans Information:
Recorded Investment	6,190,000	5,845,000
Unpaid Principal Balance	6,190,000	5,845,000
Related Allowance for Loan Losses	75,000	137,000
Average Recorded Investment	5,911,000	5,038,000
Interest Income Recognized	597,000	396,000
Impaired Loans with an Allowance Recorded: | Other Consumer
Impaired Loans Information:
Recorded Investment	528,000	282,000
Unpaid Principal Balance	528,000	282,000
Related Allowance for Loan Losses	42,000	22,000
Average Recorded Investment	516,000	173,000
Interest Income Recognized	29,000	7,000
Impaired Loans:
Impaired Loans Information:
Recorded Investment	47,600,000	38,033,000
Unpaid Principal Balance	60,330,000	46,867,000
Related Allowance for Loan Losses	5,451,000	4,170,000
Average Recorded Investment	41,651,000	33,586,000
Interest Income Recognized	1,123,000	826,000
Impaired Loans: | Commercial
Impaired Loans Information:
Recorded Investment	15,135,000	10,827,000
Unpaid Principal Balance	22,985,000	16,010,000
Related Allowance for Loan Losses	1,195,000	1,091,000
Average Recorded Investment	11,128,000	17,078,000
Interest Income Recognized	164,000	267,000
Impaired Loans: | Consumer
Impaired Loans Information:
Recorded Investment	32,465,000	27,206,000
Unpaid Principal Balance	37,345,000	30,857,000
Related Allowance for Loan Losses	4,256,000	3,079,000
Average Recorded Investment	30,523,000	16,508,000
Interest Income Recognized	$ 959,000	$ 559,000