Segment Reporting (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Segment	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting [Abstract]
Number of reportable segments			3
Line of credit	$ 5,000,000		$ 5,000,000
Participating agreement	75,000,000		75,000,000
Revenues:
Interest income	10,992,000	11,964,000	22,204,000	24,156,000
Trust and investment fee income	1,125,000	1,251,000	2,179,000	2,172,000
Other income	5,955,000	5,920,000	10,829,000	10,983,000
Total operating income	18,072,000	19,135,000	35,212,000	37,311,000
Expenses:
Interest expense	1,651,000	2,306,000	3,428,000	4,727,000
Salaries and employee benefits	7,692,000	7,506,000	15,492,000	14,863,000
Provision for (recovery of) loan losses	184,000	730,000	(4,000)	1,522,000
Other	5,416,000	5,805,000	11,544,000	11,762,000
Total operating expenses	14,943,000	16,347,000	30,460,000	32,874,000
Income before income taxes	3,129,000	2,788,000	4,752,000	4,437,000
Income tax expense	774,000	598,000	1,137,000	1,014,000
NET INCOME	2,355,000	2,190,000	3,615,000	3,423,000
Non-controlling interest in income of consolidated subsidiary	(262,000)	(421,000)	(195,000)	(72,000)
Net income attributable to Middleburg Financial Corporation	2,093,000	1,769,000	3,420,000	3,351,000
Total assets	1,217,200,000	1,218,850,000	1,217,200,000	1,218,850,000	1,236,781,000
Capital expenditures	212,000	330,000	460,000	534,000
Goodwill and other intangibles	5,932,000	6,103,000	5,932,000	6,103,000	6,017,000
Retail Banking [Member]
Revenues:
Interest income	10,904,000	11,721,000	21,992,000	23,575,000
Trust and investment fee income	0	0	0	0
Other income	1,341,000	822,000	2,185,000	1,915,000
Total operating income	12,245,000	12,543,000	24,177,000	25,490,000
Expenses:
Interest expense	1,634,000	2,219,000	3,382,000	4,491,000
Salaries and employee benefits	4,116,000	3,877,000	8,302,000	7,673,000
Provision for (recovery of) loan losses	180,000	766,000	(9,000)	1,558,000
Other	4,096,000	4,420,000	8,690,000	8,044,000
Total operating expenses	10,026,000	11,282,000	20,365,000	21,766,000
Income before income taxes	2,219,000	1,261,000	3,812,000	3,724,000
Income tax expense	686,000	493,000	963,000	806,000
NET INCOME	1,533,000	768,000	2,849,000	2,918,000
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	1,533,000	768,000	2,849,000	2,918,000
Total assets	1,203,277,000	1,201,833,000	1,203,277,000	1,201,833,000
Capital expenditures	203,000	330,000	451,000	534,000
Goodwill and other intangibles	0	0	0	0
Wealth Management [Member]
Revenues:
Interest income	3,000	3,000	7,000	5,000
Trust and investment fee income	1,162,000	1,285,000	2,257,000	2,241,000
Other income	0	0	74,000	0
Total operating income	1,165,000	1,288,000	2,338,000	2,246,000
Expenses:
Interest expense	0	0	0	0
Salaries and employee benefits	615,000	552,000	1,230,000	1,080,000
Provision for (recovery of) loan losses	0	0	0	0
Other	337,000	324,000	687,000	642,000
Total operating expenses	952,000	876,000	1,917,000	1,722,000
Income before income taxes	213,000	412,000	421,000	524,000
Income tax expense	88,000	105,000	174,000	208,000
NET INCOME	125,000	307,000	247,000	316,000
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	125,000	307,000	247,000	316,000
Total assets	6,355,000	12,380,000	6,355,000	12,380,000
Capital expenditures	0	0	0	0
Goodwill and other intangibles	4,065,000	4,236,000	4,065,000	4,236,000
Mortgage Banking [Member]
Revenues:
Interest income	409,000	699,000	878,000	1,437,000
Trust and investment fee income	0	0	0	0
Other income	4,691,000	5,246,000	8,803,000	9,413,000
Total operating income	5,100,000	5,945,000	9,681,000	10,850,000
Expenses:
Interest expense	341,000	546,000	719,000	1,097,000
Salaries and employee benefits	2,961,000	3,077,000	5,960,000	6,110,000
Provision for (recovery of) loan losses	4,000	(36,000)	5,000	(36,000)
Other	1,097,000	1,243,000	2,478,000	3,490,000
Total operating expenses	4,403,000	4,830,000	9,162,000	10,661,000
Income before income taxes	697,000	1,115,000	519,000	189,000
Income tax expense	0	0	0	0
NET INCOME	697,000	1,115,000	519,000	189,000
Non-controlling interest in income of consolidated subsidiary	(262,000)	(421,000)	(195,000)	(72,000)
Net income attributable to Middleburg Financial Corporation	435,000	694,000	324,000	117,000
Total assets	75,257,000	76,990,000	75,257,000	76,990,000
Capital expenditures	9,000	0	9,000	0
Goodwill and other intangibles	1,867,000	1,867,000	1,867,000	1,867,000
Intercompany Eliminations [Member]
Revenues:
Interest income	(324,000)	(459,000)	(673,000)	(861,000)
Trust and investment fee income	(37,000)	(34,000)	(78,000)	(69,000)
Other income	(77,000)	(148,000)	(233,000)	(345,000)
Total operating income	(438,000)	(641,000)	(984,000)	(1,275,000)
Expenses:
Interest expense	(324,000)	(459,000)	(673,000)	(861,000)
Salaries and employee benefits	0	0	0	0
Provision for (recovery of) loan losses	0	0	0	0
Other	(114,000)	(182,000)	(311,000)	(414,000)
Total operating expenses	(438,000)	(641,000)	(984,000)	(1,275,000)
Income before income taxes	0	0	0	0
Income tax expense	0	0	0	0
NET INCOME	0	0	0	0
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	0	0	0	0
Total assets	(67,689,000)	(72,353,000)	(67,689,000)	(72,353,000)
Capital expenditures	0	0	0	0
Goodwill and other intangibles	$ 0	$ 0	$ 0	$ 0