Bank Premises and Equipment, Net (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Premises and Equipment [Line Items]
Premises and equipment, gross	$ 26,221,000	$ 25,065,000
Accumulated depreciation and amortization	(11,458,000)	(10,276,000)
Premises and equipment, net	14,763,000	14,789,000
Depreciation and amortization	1,182,000	1,163,000	1,234,000
Disposals	140,000	45,000
Land [Member]
Premises and Equipment [Line Items]
Premises and equipment, gross	2,625,000	2,596,000
Building and Improvements [Member]
Premises and Equipment [Line Items]
Premises and equipment, gross	16,342,000	14,707,000
Furniture and Equipment [Member]
Premises and Equipment [Line Items]
Premises and equipment, gross	6,720,000	6,216,000
Leasehold Improvements [Member]
Premises and Equipment [Line Items]
Premises and equipment, gross	326,000	289,000
Construction in Process [Member]
Premises and Equipment [Line Items]
Premises and equipment, gross	$ 208,000	$ 1,257,000