Segment Reporting (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting [Abstract]
Number of reportable segments	3
Line of credit	$ 5,000,000
Participating agreement	75,000,000
Revenues [Abstract]
Interest income	11,212,000	12,192,000
Trust and investment fee income	1,054,000	921,000
Other income	4,874,000	5,063,000
Total operating income	17,140,000	18,176,000
Expenses [Abstract]
Interest Expense	1,777,000	2,421,000
Salaries and employee benefits	7,799,000	7,357,000
Provision for (recovery of) loan losses	(188,000)	792,000
Other	6,129,000	5,957,000
Total operating expenses	15,517,000	16,527,000
Income (loss) before income taxes	1,623,000	1,649,000
Income tax expense	363,000	416,000
NET INCOME	1,260,000	1,233,000
Non-controlling interest in loss of consolidated subsidiary	67,000	349,000
Net income (loss) attributable to Middleburg Financial Corporation	1,327,000	1,582,000
Total assets	1,213,756,000	1,203,211,000	1,236,781,000
Capital expenditures	248,000	204,000
Goodwill and other intangibles	5,975,000	6,146,000	6,017,000
Retail Banking [Member]
Revenues [Abstract]
Interest income	11,088,000	11,854,000
Trust and investment fee income	0	0
Other income	844,000	1,093,000
Total operating income	11,932,000	12,947,000
Expenses [Abstract]
Interest Expense	1,748,000	2,272,000
Salaries and employee benefits	4,185,000	3,796,000
Provision for (recovery of) loan losses	(189,000)	792,000
Other	4,595,000	3,624,000
Total operating expenses	10,339,000	10,484,000
Income (loss) before income taxes	1,593,000	2,463,000
Income tax expense	277,000	313,000
NET INCOME	1,316,000	2,150,000
Non-controlling interest in loss of consolidated subsidiary	0	0
Net income (loss) attributable to Middleburg Financial Corporation	1,316,000	2,150,000
Total assets	1,208,288,000	1,179,087,000
Capital expenditures	248,000	204,000
Goodwill and other intangibles	0	0
Wealth Management [Member]
Revenues [Abstract]
Interest income	4,000	2,000
Trust and investment fee income	1,095,000	956,000
Other income	74,000	0
Total operating income	1,173,000	958,000
Expenses [Abstract]
Interest Expense	0	0
Salaries and employee benefits	615,000	528,000
Provision for (recovery of) loan losses	0	0
Other	350,000	318,000
Total operating expenses	965,000	846,000
Income (loss) before income taxes	208,000	112,000
Income tax expense	86,000	103,000
NET INCOME	122,000	9,000
Non-controlling interest in loss of consolidated subsidiary	0	0
Net income (loss) attributable to Middleburg Financial Corporation	122,000	9,000
Total assets	6,232,000	6,239,000
Capital expenditures	0	0
Goodwill and other intangibles	4,108,000	4,279,000
Mortgage Banking [Member]
Revenues [Abstract]
Interest income	469,000	738,000
Trust and investment fee income	0	0
Other income	4,112,000	4,167,000
Total operating income	4,581,000	4,905,000
Expenses [Abstract]
Interest Expense	378,000	551,000
Salaries and employee benefits	2,999,000	3,033,000
Provision for (recovery of) loan losses	1,000	0
Other	1,381,000	2,247,000
Total operating expenses	4,759,000	5,831,000
Income (loss) before income taxes	(178,000)	(926,000)
Income tax expense	0	0
NET INCOME	(178,000)	(926,000)
Non-controlling interest in loss of consolidated subsidiary	67,000	349,000
Net income (loss) attributable to Middleburg Financial Corporation	(111,000)	(577,000)
Total assets	59,623,000	90,128,000
Capital expenditures	0	0
Goodwill and other intangibles	1,867,000	1,867,000
Intercompany Eliminations [Member]
Revenues [Abstract]
Interest income	(349,000)	(402,000)
Trust and investment fee income	(41,000)	(35,000)
Other income	(156,000)	(197,000)
Total operating income	(546,000)	(634,000)
Expenses [Abstract]
Interest Expense	(349,000)	(402,000)
Salaries and employee benefits	0	0
Provision for (recovery of) loan losses	0	0
Other	(197,000)	(232,000)
Total operating expenses	(546,000)	(634,000)
Income (loss) before income taxes	0	0
Income tax expense	0	0
NET INCOME	0	0
Non-controlling interest in loss of consolidated subsidiary	0	0
Net income (loss) attributable to Middleburg Financial Corporation	0	0
Total assets	(60,387,000)	(72,243,000)
Capital expenditures	0	0
Goodwill and other intangibles	$ 0	$ 0