Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting [Abstract]
Number of reportable segments	3
Revenues [Abstract]
Interest income	$ 47,023	$ 48,636	$ 48,031
Wealth management fees	4,269	4,029	3,957
Other income	25,185	15,933	16,833
Total operating income	76,477	68,598	68,821
Expenses [Abstract]
Interest Expense	8,824	10,691	14,175
Salaries and employee benefits	30,417	27,373	24,103
Provision for loan losses	3,438	2,884	12,005
Other expenses	23,842	21,638	23,148
Total operating expenses	66,521	62,586	73,431
Income (loss) before income taxes and non-controlling interest	9,956	6,012	(4,888)
Income tax expense (benefit)	1,966	1,350	(2,562)
Net income (loss)	7,990	4,662	(2,326)
Non-controlling interest in consolidated subsidiary	(1,504)	298	(362)
Net income (loss) attributable to Middleburg Financial Corporation	6,486	4,960	(2,688)
Total assets	1,236,781	1,192,860	1,104,567
Capital expenditures	1,045	1,351	939
Goodwill and other intangibles	6,017	6,189	6,360
Commercial & Retail Banking [Member]
Revenues [Abstract]
Interest income	46,095	47,080	47,098
Wealth management fees	0	0	0
Other income	3,895	3,521	2,703
Total operating income	49,990	50,601	49,801
Expenses [Abstract]
Interest Expense	8,433	10,374	13,783
Salaries and employee benefits	15,678	15,390	12,887
Provision for loan losses	3,410	3,141	11,122
Other expenses	17,413	15,531	17,589
Total operating expenses	44,934	44,436	55,381
Income (loss) before income taxes and non-controlling interest	5,056	6,165	(5,580)
Income tax expense (benefit)	1,593	1,230	(2,575)
Net income (loss)	3,463	4,935	(3,005)
Non-controlling interest in consolidated subsidiary	0	0	0
Net income (loss) attributable to Middleburg Financial Corporation	3,463	4,935	(3,005)
Total assets	1,216,813	1,262,358	1,081,231
Capital expenditures	947	1,197	852
Goodwill and other intangibles	0	0	0
Wealth Management [Member]
Revenues [Abstract]
Interest income	10	14	9
Wealth management fees	4,409	4,150	3,782
Other income	0	0	0
Total operating income	4,419	4,164	3,782
Expenses [Abstract]
Interest Expense	0	0	0
Salaries and employee benefits	2,208	2,369	2,588
Provision for loan losses	0	0	0
Other expenses	1,300	1,232	1,356
Total operating expenses	3,508	3,601	3,944
Income (loss) before income taxes and non-controlling interest	911	563	(153)
Income tax expense (benefit)	373	120	13
Net income (loss)	538	443	(166)
Non-controlling interest in consolidated subsidiary	0	0	0
Net income (loss) attributable to Middleburg Financial Corporation	538	443	(166)
Total assets	6,416	5,975	5,931
Capital expenditures	0	3	0
Goodwill and other intangibles	4,150	4,322	4,493
Mortgage Banking [Member]
Revenues [Abstract]
Interest income	2,740	2,931	2,315
Wealth management fees	0	0	0
Other income	21,787	12,543	14,141
Total operating income	24,527	15,474	16,456
Expenses [Abstract]
Interest Expense	2,213	1,706	1,782
Salaries and employee benefits	12,531	9,614	8,628
Provision for loan losses	28	(257)	883
Other expenses	5,766	5,127	4,318
Total operating expenses	20,538	16,190	15,611
Income (loss) before income taxes and non-controlling interest	3,989	(716)	845
Income tax expense (benefit)	0	0	0
Net income (loss)	3,989	(716)	845
Non-controlling interest in consolidated subsidiary	(1,504)	298	(362)
Net income (loss) attributable to Middleburg Financial Corporation	2,485	(418)	483
Total assets	94,282	101,876	70,512
Capital expenditures	98	151	87
Goodwill and other intangibles	1,867	1,867	1,867
Intercompany Eliminations [Member]
Revenues [Abstract]
Interest income	(1,822)	(1,389)	(1,391)
Wealth management fees	(140)	(121)	(103)
Other income	(497)	(131)	(11)
Total operating income	(2,459)	(1,641)	(1,505)
Expenses [Abstract]
Interest Expense	(1,822)	(1,389)	1,390
Salaries and employee benefits	0	0	0
Provision for loan losses	0	0	0
Other expenses	(637)	(252)	(115)
Total operating expenses	(2,459)	(1,641)	(1,505)
Income (loss) before income taxes and non-controlling interest	0	0	0
Income tax expense (benefit)	0	0	0
Net income (loss)	0	0	0
Non-controlling interest in consolidated subsidiary	0	0	0
Net income (loss) attributable to Middleburg Financial Corporation	0	0	0
Total assets	(80,730)	(177,349)	(53,107)
Capital expenditures		0	0
Goodwill and other intangibles	$ 0	$ 0	$ 0