Loans and the Allowance for Loan Losses (Aging Analysis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 118	$ 3,658
60-89 Days Past Due	2,371	6,978
Greater Than 90 Days	5,537	7,900
Total Past Due	8,026	18,536
Current	862,872	737,457
Total Loans Receivable	870,898	755,993
Loans Receivable >90 Days And Accruing	570	1,029
Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	54	137
60-89 Days Past Due		1,544
Greater Than 90 Days	224	125
Total Past Due	278	1,806
Current	171,215	144,905
Total Loans Receivable	171,493	146,711
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		1,331
60-89 Days Past Due	1,434	5,335
Greater Than 90 Days	988	1,254
Total Past Due	2,422	7,920
Current	481,721	400,244
Total Loans Receivable	484,143	408,164
Loans Receivable >90 Days And Accruing	570	1,029
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days	314	3,044
Total Past Due	314	3,044
Current	40,569	36,344
Total Loans Receivable	40,883	39,388
Residential mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	58	2,174
60-89 Days Past Due	937	99
Greater Than 90 Days	4,011	3,477
Total Past Due	5,006	5,750
Current	168,851	155,021
Total Loans Receivable	173,857	160,771
Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	6	16
Total Past Due	6	16
Current	516	943
Total Loans Receivable	$ 522	$ 959