Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (Loss) before non-controlling interest	$ 7,990	$ 4,662	$ (2,326)
Other comprehensive income:
Unrealized holding gains arising during the period (net of tax of $1,511, $2,826, and $646 respectively for 2012, 2011, and 2010)	2,932	5,485	1,254
Reclassification adjustment for gains included in net income (net of tax of $151, $156, and $294 respectively for 2012, 2011, and 2010)	(294)	(304)	(572)
Unrealized losses on securities for which other-than-temporary impairment has been recognized in earnings (net of tax of $0, $9, and $375 respectively for 2012, 2011, and 2010)	0	16	728
Unrealized gain (loss) on interest rate swap (net of tax of $50, $213, and $106 respectively for 2012, 2011, and 2010)	(97)	(413)	206
Change in benefit obligation and plan assets for defined benefit plan (net of tax of $0, $80, and $80 respectively for 2012, 2011, and 2010)	0	154	(154)
Total other comprehensive income	2,541	4,938	1,462
Total comprehensive income (loss)	10,531	9,600	(864)
Comprehensive loss (income) attributable to non-controlling interest	(1,504)	298	(362)
Comprehensive income (loss) attributable to Middleburg Financial Corporation	$ 9,027	$ 9,898	$ (1,226)