Segment Reporting (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 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	10,954,000	11,407,000	33,158,000	35,563,000
Trust and investment fee income	963,000	928,000	2,937,000	2,828,000
Other income	5,165,000	7,390,000	16,199,000	18,645,000
Total operating income	17,082,000	19,725,000	52,294,000	57,036,000
Expenses:
Interest expense	1,634,000	2,190,000	5,062,000	6,917,000
Salaries and employee benefits	7,750,000	7,276,000	23,242,000	22,139,000
Provision for (recovery of) loan losses	3,000	635,000	(1,000)	2,156,000
Other	5,555,000	6,560,000	17,099,000	18,324,000
Total operating expenses	14,942,000	16,661,000	45,402,000	49,536,000
Income before income taxes	2,140,000	3,064,000	6,892,000	7,500,000
Income tax expense	491,000	565,000	1,628,000	1,578,000
NET INCOME	1,649,000	2,499,000	5,264,000	5,922,000
Non-controlling interest in income of consolidated subsidiary	(38,000)	(785,000)	(233,000)	(856,000)
Net income attributable to Middleburg Financial Corporation	1,611,000	1,714,000	5,031,000	5,066,000
Total assets	1,215,327,000	1,235,961,000	1,215,327,000	1,235,961,000	1,236,781,000
Capital expenditures	813,000	6,000	1,273,000	541,000
Goodwill and other intangibles	5,889,000	6,060,000	5,889,000	6,060,000	6,017,000
Retail Banking [Member]
Revenues:
Interest income	10,750,000	11,262,000	32,742,000	34,837,000
Trust and investment fee income	0	0	0	0
Other income	899,000	1,164,000	3,363,000	3,351,000
Total operating income	11,649,000	12,426,000	36,105,000	38,188,000
Expenses:
Interest expense	1,574,000	2,115,000	4,956,000	6,606,000
Salaries and employee benefits	4,183,000	3,912,000	12,485,000	11,585,000
Provision for (recovery of) loan losses	0	642,000	(9,000)	2,127,000
Other	4,240,000	5,221,000	12,930,000	13,267,000
Total operating expenses	9,997,000	11,890,000	30,362,000	33,585,000
Income before income taxes	1,652,000	536,000	5,743,000	4,603,000
Income tax expense	440,000	514,000	1,403,000	1,319,000
NET INCOME	1,212,000	22,000	4,340,000	3,284,000
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	1,212,000	22,000	4,340,000	3,284,000
Total assets	1,202,151,000	1,209,455,000	1,202,151,000	1,209,455,000
Capital expenditures	693,000	6,000	1,144,000	541,000
Goodwill and other intangibles	0	0	0	0
Wealth Management [Member]
Revenues:
Interest income	4,000	2,000	11,000	7,000
Trust and investment fee income	1,000,000	963,000	3,052,000	2,932,000
Other income	0	0	0	0
Total operating income	1,004,000	965,000	3,063,000	2,939,000
Expenses:
Interest expense	0	0	0	0
Salaries and employee benefits	393,000	358,000	1,623,000	1,438,000
Provision for (recovery of) loan losses	0	0	0	0
Other	223,000	232,000	910,000	874,000
Total operating expenses	616,000	590,000	2,533,000	2,312,000
Income before income taxes	388,000	375,000	530,000	627,000
Income tax expense	51,000	51,000	225,000	259,000
NET INCOME	337,000	324,000	305,000	368,000
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	337,000	324,000	305,000	368,000
Total assets	12,192,000	12,789,000	12,192,000	12,789,000
Capital expenditures	5,000	0	5,000	0
Goodwill and other intangibles	4,022,000	4,193,000	4,022,000	4,193,000
Mortgage Banking [Member]
Revenues:
Interest income	520,000	630,000	1,398,000	2,067,000
Trust and investment fee income	0	0	0	0
Other income	4,358,000	6,306,000	13,161,000	15,719,000
Total operating income	4,878,000	6,936,000	14,559,000	17,786,000
Expenses:
Interest expense	380,000	562,000	1,099,000	1,659,000
Salaries and employee benefits	3,174,000	3,006,000	9,134,000	9,116,000
Provision for (recovery of) loan losses	3,000	(7,000)	8,000	29,000
Other	1,221,000	1,222,000	3,699,000	4,712,000
Total operating expenses	4,778,000	4,783,000	13,940,000	15,516,000
Income before income taxes	100,000	2,153,000	619,000	2,270,000
Income tax expense	0	0	0	0
NET INCOME	100,000	2,153,000	619,000	2,270,000
Non-controlling interest in income of consolidated subsidiary	(38,000)	(785,000)	(233,000)	(856,000)
Net income attributable to Middleburg Financial Corporation	62,000	1,368,000	386,000	1,414,000
Total assets	52,281,000	104,919,000	52,281,000	104,919,000
Capital expenditures	115,000	0	124,000	0
Goodwill and other intangibles	1,867,000	1,867,000	1,867,000	1,867,000
Intercompany Eliminations [Member]
Revenues:
Interest income	(320,000)	(487,000)	(993,000)	(1,348,000)
Trust and investment fee income	(37,000)	(35,000)	(115,000)	(104,000)
Other income	(92,000)	(80,000)	(325,000)	(425,000)
Total operating income	(449,000)	(602,000)	(1,433,000)	(1,877,000)
Expenses:
Interest expense	(320,000)	(487,000)	(993,000)	(1,348,000)
Salaries and employee benefits	0	0	0	0
Provision for (recovery of) loan losses	0	0	0	0
Other	(129,000)	(115,000)	(440,000)	(529,000)
Total operating expenses	(449,000)	(602,000)	(1,433,000)	(1,877,000)
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	(51,297,000)	(91,202,000)	(51,297,000)	(91,202,000)
Capital expenditures	0	0	0	0
Goodwill and other intangibles	$ 0	$ 0	$ 0	$ 0