Condensed Financial Information - Parent Corporation Only STATEMENTS OF OPERATIONS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INCOME:
Interest and dividends from investments	$ 43,325	$ 44,272	$ 47,023
EXPENSES:
Salaries and employee benefits	22,601	30,627	30,417
Interest expense	5,243	6,567	8,824
Other	8,041	9,300	8,602
Income before income taxes	9,827	8,094	9,956
Income tax benefit	2,341	1,931	1,966
Net income attributable to Middleburg Financial Corporation	7,584	6,154	6,486
Middleburg Financial Corporation [Member]
INCOME:
Dividends from subsidiaries	3,440	2,670	1,880
Interest and dividends from investments	15	0	0
Other income	0	41	37
Total income	3,455	2,711	1,917
EXPENSES:
Salaries and employee benefits	746	671	517
Legal and professional fees	56	20	27
Directors fees	280	279	251
Interest expense	279	279	280
Other	401	361	416
Total expenses	1,762	1,610	1,491
Income before income taxes	1,693	1,101	426
Income tax benefit	(753)	(542)	(559)
Income before equity in undistributed income of subsidiaries	2,446	1,643	985
Equity in undistributed income of subsidiaries	5,138	4,511	5,501
Net income attributable to Middleburg Financial Corporation	$ 7,584	$ 6,154	$ 6,486