Allowance for Loan Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 7,496	$ 7,855	$ 6,919	$ 7,676
Financing Receivable, Allowance for Credit Losses, Charge-offs	(1,648)	(809)	(1,687)	(1,295)
Financing Receivable, Allowance for Credit Losses, Recoveries	55	100	71	165
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(1,593)	(709)	(1,616)	(1,130)
Provision for loan losses	600	600	1,200	1,200
Financing Receivable, Allowance for Credit Losses	6,503	7,746	6,503	7,746
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	845	1,142	948	972
Financing Receivable, Allowance for Credit Losses, Charge-offs	(95)	(306)	(95)	(362)
Financing Receivable, Allowance for Credit Losses, Recoveries	5	12	8	23
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(90)	(294)	(87)	(339)
Provision for loan losses	(24)	(81)	(130)	134
Financing Receivable, Allowance for Credit Losses	731	767	731	767
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,439	2,257	1,470	2,223
Financing Receivable, Allowance for Credit Losses, Charge-offs	(231)	(112)	(231)	(145)
Financing Receivable, Allowance for Credit Losses, Recoveries	1	0	1	1
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(230)	(112)	(230)	(144)
Provision for loan losses	414	614	383	680
Financing Receivable, Allowance for Credit Losses	1,623	2,759	1,623	2,759
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	3,816	2,697	3,009	2,893
Financing Receivable, Allowance for Credit Losses, Charge-offs	(1,218)	0	(1,218)	(339)
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(1,218)	0	(1,218)	(339)
Provision for loan losses	219	25	1,026	168
Financing Receivable, Allowance for Credit Losses	2,817	2,722	2,817	2,722
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,332	1,284	1,363	1,336
Financing Receivable, Allowance for Credit Losses, Charge-offs	(78)	(389)	(111)	(446)
Financing Receivable, Allowance for Credit Losses, Recoveries	45	86	51	135
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(33)	(303)	(60)	(311)
Provision for loan losses	(21)	123	(25)	79
Financing Receivable, Allowance for Credit Losses	1,278	1,104	1,278	1,104
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	64	202	129	141
Financing Receivable, Allowance for Credit Losses, Charge-offs	(26)	(2)	(32)	(3)
Financing Receivable, Allowance for Credit Losses, Recoveries	4	2	11	6
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(22)	0	(21)	3
Provision for loan losses	12	(12)	(54)	46
Financing Receivable, Allowance for Credit Losses	54	190	54	190
Financing Receivable, Allowance For Loan Loss, Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	0	273	0	111
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	0	0	0	0
Provision for loan losses	0	(69)	0	93
Financing Receivable, Allowance for Credit Losses	$ 0	$ 204	$ 0	$ 204