Premises and Equipment (Summary of Premises and Equipment) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	$ (10,026,000)	$ (8,019,000)
Net premises and equipment	21,976,000	23,507,000
Depreciation expense	2,006,000	2,107,000	2,029,000
Costs incurred for the selection and development of future store locations	5,100,000
Costs to complete projects in process	8,000,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	200,000	200,000
Costs incurred for the selection and development of future store locations	4,000,000
Bank building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,051,000	1,030,000
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,714,000	18,657,000
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,894,000	6,473,000
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,143,000	$ 5,166,000