Condensed Financial Information - Parent Corporation Only BALANCE SHEETS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Balance Sheet Statements, Captions [Line Items]
Cash on deposit with subsidiary bank	$ 7,396us-gaap_CashAndDueFromBanks	$ 6,648us-gaap_CashAndDueFromBanks
Investment securities available for sale	348,263us-gaap_AvailableForSaleSecurities	328,423us-gaap_AvailableForSaleSecurities
Investment in subsidiaries	155	155
TOTAL ASSETS	1,222,857us-gaap_Assets	1,227,753us-gaap_Assets	1,236,781us-gaap_Assets
Subordinated notes	5,155us-gaap_SubordinatedDebt	5,155us-gaap_SubordinatedDebt
TOTAL LIABILITIES	1,100,823us-gaap_Liabilities	1,112,680us-gaap_Liabilities
Common stock	17,494us-gaap_CommonStockValue	17,403us-gaap_CommonStockValue
Capital surplus	44,892	44,251
Retained earnings	55,854	50,689
Accumulated other comprehensive income, net	3,794	232	6,467	3,926
TOTAL SHAREHOLDERS' EQUITY	122,034	115,073	117,122	108,013
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	1,222,857	1,227,753
Middleburg Financial Corporation [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash on deposit with subsidiary bank	563	638
Money market fund	0	8
Investment securities available for sale	0	44
Investment in subsidiaries	124,242	115,444
Other assets	2,651	1,650
TOTAL ASSETS	127,456	117,784
Subordinated notes	5,155	5,155
Other liabilities	267	54
TOTAL LIABILITIES	5,422	5,209
Common stock	17,494	17,403
Capital surplus	44,892	44,251
Retained earnings	55,854	50,689
Accumulated other comprehensive income, net	3,794	232
TOTAL SHAREHOLDERS' EQUITY	122,034	112,575
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 127,456	$ 117,784

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3