Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Revenues:
Interest income	$ 10,703	$ 10,790	$ 31,754	$ 32,838
Trust and investment fee income	1,300	1,312	4,044	3,703
Other income	1,054	968	3,753	8,732
Total operating income	13,057	13,070	39,551	45,273
Expenses:
Interest expense	1,044	1,245	3,151	4,071
Salaries and employee benefits	4,834	4,441	14,664	17,467
Provision for (recovery of) loan losses	(432)	550	(407)	1,510
Other	4,440	3,950	12,588	14,190
Total operating expenses	9,886	10,186	29,996	37,238
Income before income taxes	3,171	2,884	9,555	8,035
Income tax expense	850	763	2,506	2,179
NET INCOME	2,321	2,121	7,049	5,856
Non-controlling interest in income of consolidated subsidiary	0	0	0	98
Net income attributable to Middleburg Financial Corporation	2,321	2,121	7,049	5,954
Total assets	1,261,290	1,207,727	1,261,290	1,207,727	$ 1,222,857
Capital expenditures	285	311	2,756	762
Goodwill and other intangibles	3,679	3,850	3,679	3,850	$ 3,807
Retail Banking [Member]
Revenues:
Interest income	10,700	10,876	31,746	32,665
Trust and investment fee income	132	193	415	479
Other income	1,054	989	3,753	3,657
Total operating income	11,886	12,058	35,914	36,801
Expenses:
Interest expense	1,044	1,335	3,151	4,055
Salaries and employee benefits	4,355	3,877	13,045	11,996
Provision for (recovery of) loan losses	(432)	550	(407)	1,476
Other	2,465	3,722	10,126	11,792
Total operating expenses	7,432	9,484	25,915	29,319
Income before income taxes	4,454	2,574	9,999	7,482
Income tax expense	722	635	2,063	1,847
NET INCOME	3,732	1,939	7,936	5,635
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	3,732	1,939	7,936	5,635
Total assets	1,259,205	1,322,493	1,259,205	1,322,493
Capital expenditures	285	307	2,756	748
Goodwill and other intangibles	0	0	0	0
Wealth Management [Member]
Revenues:
Interest income	3	4	8	11
Trust and investment fee income	1,209	1,157	3,752	3,339
Other income	0	0	0	0
Total operating income	1,212	1,161	3,760	3,350
Expenses:
Interest expense	0	0	0	0
Salaries and employee benefits	479	564	1,619	1,699
Provision for (recovery of) loan losses	0	0	0	0
Other	2,016	287	2,585	837
Total operating expenses	2,495	851	4,204	2,536
Income before income taxes	(1,283)	310	(444)	814
Income tax expense	128	128	443	332
NET INCOME	(1,411)	182	(887)	482
Non-controlling interest in income of consolidated subsidiary	0	0	0	0
Net income attributable to Middleburg Financial Corporation	(1,411)	182	(887)	482
Total assets	6,615	12,505	6,615	12,505
Capital expenditures	0	1	0	11
Goodwill and other intangibles	3,679	3,850	3,679	3,850
Mortgage Banking [Member]
Revenues:
Interest income	0	0	0	450
Trust and investment fee income	0	0	0	0
Other income	0	0	0	5,121
Total operating income	0	0	0	5,571
Expenses:
Interest expense	0	0	0	304
Salaries and employee benefits	0	0	0	3,772
Provision for (recovery of) loan losses	0	0	0	34
Other	0	0	0	1,722
Total operating expenses	0	0	0	5,832
Income before income taxes	0	0	0	(261)
Income tax expense	0	0	0	0
NET INCOME	0	0	0	(261)
Non-controlling interest in income of consolidated subsidiary	0	0	0	98
Net income attributable to Middleburg Financial Corporation	0	0	0	(163)
Total assets	0	0	0	0
Capital expenditures	0	3	0	3
Goodwill and other intangibles	0	0	0	0
Intercompany Eliminations [Member]
Revenues:
Interest income	0	(90)	0	(288)
Trust and investment fee income	(41)	(38)	(123)	(115)
Other income	0	(21)	0	(46)
Total operating income	(41)	(149)	(123)	(449)
Expenses:
Interest expense	0	(90)	0	(288)
Salaries and employee benefits	0	0	0	0
Provision for (recovery of) loan losses	0	0	0	0
Other	(41)	(59)	(123)	(161)
Total operating expenses	(41)	(149)	(123)	(449)
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	(4,530)	(127,271)	(4,530)	(127,271)
Capital expenditures	0	0	0	0
Goodwill and other intangibles	$ 0	$ 0	$ 0	$ 0