Loans (Details 6) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	$ 516,937	$ 495,835
Pass [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	471,574	437,555
Special Mention [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	4,468	7,348
Substandard [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	40,026	50,003
Doubtful [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	869	929
Commercial, industrial, and agricultural [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	259,906	253,324
Commercial, industrial, and agricultural [Member] | Pass [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	239,052	223,457
Commercial, industrial, and agricultural [Member] | Special Mention [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	1,624	4,176
Commercial, industrial, and agricultural [Member] | Substandard [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	19,067	25,490
Commercial, industrial, and agricultural [Member] | Doubtful [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	163	201
Commercial mortgages [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	257,031	242,511
Commercial mortgages [Member] | Pass [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	232,522	214,098
Commercial mortgages [Member] | Special Mention [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	2,844	3,172
Commercial mortgages [Member] | Substandard [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	20,959	24,513
Commercial mortgages [Member] | Doubtful [Member]
Schedule of loan assigned a risk rating within 12 months of the balance sheet date
Financing receivable recorded investment	$ 706	$ 728