Premises and Equipment, Net (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	$ 36,693,000	$ 37,017,000
Less accumulated depreciation	(16,106,000)	(15,711,000)
Total	20,587,000	21,306,000
Depreciation expense	1,700,000	1,600,000	1,400,000
Future minimum rent commitments under various operating leases [Abstract]
2013	3,531,000
2014	3,306,000
2015	3,004,000
2016	2,671,000
2017	2,594,000
Thereafter	17,866,000
Net Total	32,972,000
Rent expense	3,600,000	3,300,000	2,900,000
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	2,370,000	2,379,000
Facilities [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	20,472,000	20,144,000
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	12,362,000	12,861,000
Construction in Process and Deposits on Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	$ 1,489,000	$ 1,633,000