Segment Reporting (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting [Abstract]
Number of principal business activities			3
Line of credit	$ 5,000,000		$ 5,000,000
Participating agreement	75,000,000		75,000,000
Revenue [Abstract]
Interest Income	11,986,000	12,155,000	24,327,000	23,913,000
Trust and investment fee income	1,251,000	983,000	2,172,000	1,850,000
Other income	5,898,000	5,105,000	10,812,000	9,143,000
Total operating income	19,135,000	18,243,000	37,311,000	34,906,000
Expense [Abstract]
Interest Expense	2,306,000	2,760,000	4,727,000	5,483,000
Salaries and employee benefits	7,506,000	7,813,000	14,863,000	15,129,000
Provision for loan losses	730,000	1,087,000	1,522,000	1,541,000
Other	5,805,000	5,202,000	11,762,000	10,060,000
Total operating expenses	16,347,000	16,862,000	32,874,000	32,213,000
Income (loss) before income taxes and non-controlling interest	2,788,000	1,379,000	4,437,000	2,693,000
Income tax expense	598,000	301,000	1,014,000	618,000
NET INCOME	2,190,000	1,078,000	3,423,000	2,075,000
Non-controlling interest in loss of consolidated subsidiary	(421,000)	121,000	(72,000)	351,000
Net income attributable to Middleburg Financial Corporation	1,769,000	1,199,000	3,351,000	2,426,000
Total assets	1,218,850,000	1,144,667,000	1,218,850,000	1,144,667,000	1,192,860,000
Capital Expenditure	330,000	441,000	534,000	694,000
Goodwill and other intangibles	6,103,000	6,286,000	6,103,000	6,286,000
Retail Banking [Member]
Revenue [Abstract]
Interest Income	11,721,000	11,808,000	23,575,000	23,120,000
Trust and investment fee income	0	0	0	0
Other income	822,000	675,000	1,915,000	1,611,000
Total operating income	12,543,000	12,483,000	25,490,000	24,731,000
Expense [Abstract]
Interest Expense	2,219,000	2,706,000	4,491,000	5,367,000
Salaries and employee benefits	3,877,000	3,265,000	7,673,000	6,926,000
Provision for loan losses	766,000	1,087,000	1,558,000	1,541,000
Other	4,420,000	3,772,000	8,044,000	7,386,000
Total operating expenses	11,282,000	10,830,000	21,766,000	21,220,000
Income (loss) before income taxes and non-controlling interest	1,261,000	1,653,000	3,724,000	3,511,000
Income tax expense	493,000	283,000	806,000	605,000
NET INCOME	768,000	1,370,000	2,918,000	2,906,000
Non-controlling interest in loss of consolidated subsidiary	0		0	0
Net income attributable to Middleburg Financial Corporation	768,000	1,370,000	2,918,000	2,906,000
Total assets	1,201,833,000	1,130,366,000	1,201,833,000	1,130,366,000
Capital Expenditure	330,000	441,000	534,000	691,000
Goodwill and other intangibles	0	0	0	0
Wealth Management [Member]
Revenue [Abstract]
Interest Income	3,000	3,000	5,000	6,000
Trust and investment fee income	1,285,000	1,125,000	2,241,000	1,850,000
Other income	0	195,000	0	365,000
Total operating income	1,288,000	1,323,000	2,246,000	2,221,000
Expense [Abstract]
Interest Expense	0	0	0	0
Salaries and employee benefits	552,000	933,000	1,080,000	1,542,000
Provision for loan losses	0	0	0	0
Other	324,000	343,000	642,000	641,000
Total operating expenses	876,000	1,276,000	1,722,000	2,183,000
Income (loss) before income taxes and non-controlling interest	412,000	47,000	524,000	38,000
Income tax expense	105,000	20,000	208,000	13,000
NET INCOME	307,000	27,000	316,000	25,000
Non-controlling interest in loss of consolidated subsidiary	0		0	0
Net income attributable to Middleburg Financial Corporation	307,000	27,000	316,000	25,000
Total assets	12,380,000	15,694,000	12,380,000	15,694,000
Capital Expenditure	0	0	0	3,000
Goodwill and other intangibles	4,236,000	4,419,000	4,236,000	4,419,000
Mortgage Banking [Member]
Revenue [Abstract]
Interest Income	721,000	634,000	1,608,000	1,325,000
Trust and investment fee income	0	0	0	0
Other income	5,224,000	4,067,000	9,242,000	7,168,000
Total operating income	5,945,000	4,701,000	10,850,000	8,493,000
Expense [Abstract]
Interest Expense	546,000	343,000	1,097,000	654,000
Salaries and employee benefits	3,077,000	3,615,000	6,110,000	6,661,000
Provision for loan losses	(36,000)	0	(36,000)	0
Other	1,243,000	1,062,000	3,490,000	2,034,000
Total operating expenses	4,830,000	5,020,000	10,661,000	9,349,000
Income (loss) before income taxes and non-controlling interest	1,115,000	(319,000)	189,000	(856,000)
Income tax expense	0	0	0	0
NET INCOME	1,115,000	(319,000)	189,000	(856,000)
Non-controlling interest in loss of consolidated subsidiary	(421,000)	121,000	(72,000)	351,000
Net income attributable to Middleburg Financial Corporation	694,000	(198,000)	117,000	(505,000)
Total assets	76,990,000	72,652,000	76,990,000	72,652,000
Capital Expenditure	0	0	0	0
Goodwill and other intangibles	1,867,000	1,867,000	1,867,000	1,867,000
Intercompany Eliminations [Member]
Revenue [Abstract]
Interest Income	(459,000)	(290,000)	(861,000)	(538,000)
Trust and investment fee income	(34,000)	(142,000)	(69,000)	0
Other income	(148,000)	168,000	(345,000)	(1,000)
Total operating income	(641,000)	(264,000)	(1,275,000)	(539,000)
Expense [Abstract]
Interest Expense	(459,000)	(289,000)	(861,000)	538,000
Salaries and employee benefits	0	0	0	0
Provision for loan losses	0	0	0	0
Other	(182,000)	25,000	(414,000)	(1,000)
Total operating expenses	(641,000)	(264,000)	(1,275,000)	(539,000)
Income (loss) before income taxes and non-controlling interest	0	0	0	0
Income tax expense	0	0	0	0
NET INCOME	0	0	0	0
Non-controlling interest in loss of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	0	0	0	0
Total assets	(72,353,000)	(74,045,000)	(72,353,000)	(74,045,000)
Capital Expenditure	0	0	0	0
Goodwill and other intangibles	$ 0	$ 0	$ 0	$ 0