Allowance for Loan Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 6,723	$ 6,919
Financing Receivable, Allowance for Credit Losses, Charge-offs	(390)	(40)
Financing Receivable, Allowance for Credit Losses, Recoveries	36	17
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(354)	(23)
Provision for loan losses	400	600
Financing Receivable, Allowance for Credit Losses	6,769	7,496
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	812	948
Financing Receivable, Allowance for Credit Losses, Charge-offs	(68)	0
Financing Receivable, Allowance for Credit Losses, Recoveries	12	3
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(56)	3
Provision for loan losses	(187)	(106)
Financing Receivable, Allowance for Credit Losses	569	845
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,545	1,470
Financing Receivable, Allowance for Credit Losses, Charge-offs	(39)	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(39)	0
Provision for loan losses	113	(31)
Financing Receivable, Allowance for Credit Losses	1,619	1,439
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	3,137	3,009
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	5	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	5	0
Provision for loan losses	429	807
Financing Receivable, Allowance for Credit Losses	3,571	3,816
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,126	1,363
Financing Receivable, Allowance for Credit Losses, Charge-offs	(266)	(33)
Financing Receivable, Allowance for Credit Losses, Recoveries	13	6
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(253)	(27)
Provision for loan losses	12	(4)
Financing Receivable, Allowance for Credit Losses	885	1,332
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	103	129
Financing Receivable, Allowance for Credit Losses, Charge-offs	(17)	(7)
Financing Receivable, Allowance for Credit Losses, Recoveries	6	8
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(11)	1
Provision for loan losses	33	(66)
Financing Receivable, Allowance for Credit Losses	$ 125	$ 64