Loans Past Due Analysis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	$ 385,468	$ 385,823
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	621	2,010
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	58
Financing Receivable, Recorded Investment, Total Still Accruing	386,089	387,891
Financing Receivable, Recorded Investment, Nonaccrual Status	4,748	10,535
Loans and Leases Receivable, Gross, Carrying Amount	390,837	398,426	380,555
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	55,630	59,101
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	47	173
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	55,677	59,274
Financing Receivable, Recorded Investment, Nonaccrual Status	59	60
Loans and Leases Receivable, Gross, Carrying Amount	55,736	59,334	56,804
Construction And Land Development Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	39,354	35,917
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	135	8
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	39,489	35,925
Financing Receivable, Recorded Investment, Nonaccrual Status	1,615	1,706
Loans and Leases Receivable, Gross, Carrying Amount	41,104	37,631	34,350
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	63,668	63,323
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	63,668	63,323
Financing Receivable, Recorded Investment, Nonaccrual Status	1,181	1,045
Loans and Leases Receivable, Gross, Carrying Amount	64,849	64,368
Commercial Real Estate Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	113,715	113,344
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	230
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	113,715	113,574
Financing Receivable, Recorded Investment, Nonaccrual Status	429	5,669
Loans and Leases Receivable, Gross, Carrying Amount	114,144	119,243
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	177,383	176,667
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	0	230
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	177,383	176,897
Financing Receivable, Recorded Investment, Nonaccrual Status	1,610	6,714
Loans and Leases Receivable, Gross, Carrying Amount	178,993	183,611	173,265
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	56,557	55,521
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	190	1,202
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	58
Financing Receivable, Recorded Investment, Total Still Accruing	56,747	56,781
Financing Receivable, Recorded Investment, Nonaccrual Status	1,057	1,306
Loans and Leases Receivable, Gross, Carrying Amount	57,804	58,087
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	44,559	46,460
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	213	335
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	44,772	46,795
Financing Receivable, Recorded Investment, Nonaccrual Status	402	749
Loans and Leases Receivable, Gross, Carrying Amount	45,174	47,544
Residential Real Estate Loans, Total [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	101,116	101,981
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	403	1,537
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	58
Financing Receivable, Recorded Investment, Total Still Accruing	101,519	103,576
Financing Receivable, Recorded Investment, Nonaccrual Status	1,459	2,055
Loans and Leases Receivable, Gross, Carrying Amount	102,978	105,631	105,183
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Current	11,985	12,157
Financing Receivable, Recorded Investment, 30 To 89 Days Past Due	36	62
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Total Still Accruing	12,021	12,219
Financing Receivable, Recorded Investment, Nonaccrual Status	5	0
Loans and Leases Receivable, Gross, Carrying Amount	$ 12,026	$ 12,219	$ 10,953