Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]
Net income	$ 2,499	$ 1,621	$ 5,922	$ 3,696
Other comprehensive income, net of tax:
Unrealized holding gains arising during the period (net of tax of $673, $942, $1,422 and $3,035 respectively for the periods presented)	1,307	1,828	2,758	5,891
Reclassification adjustment for gains included in net income (net of tax of $56, $47, $154, and $89 respectively for the periods presented)	(108)	(94)	(298)	(174)
Unrealized losses on securities for which other-than-temporary impairment has been recognized in earnings (net of tax)	0	14	0	15
Unrealized (loss) on interest rate swap (net of tax of $18, $169, $63, and $202 respectively for the periods presented)	(35)	(329)	(122)	(393)
Total other comprehensive income	1,164	1,419	2,338	5,339
Total comprehensive income	3,663	3,040	8,260	9,035
Comprehensive (income) loss attributable to non-controlling interest	(785)	(223)	(856)	128
Comprehensive income attributable to Middleburg Financial Corporation	$ 2,878	$ 2,817	$ 7,404	$ 9,163