Condensed Financial Information - Parent Corporation Only - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net income	$ 8,064	$ 7,830	$ 7,584
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	925	605	426
(Increase) decrease in other assets	(1,406)	(4,826)	(2,604)
(Decrease) increase in other liabilities	(98)	448	2,447
Net cash provided by operating activities	15,977	12,303	48,789
Cash Flows from Investing Activities
Proceeds from maturity, calls, principal repayments and sales of securities available for sale	155,485	106,154	132,286
Net cash provided by (used in) investing activities	1,373	(93,337)	(44,693)
Cash Flows from Financing Activities
Net proceeds from issuance of common stock	1,742	0	394
Cash dividends paid on common stock	(3,701)	(3,292)	(2,419)
Net cash provided by (used in) provided by financing activities	(28,034)	65,240	(16,417)
Decrease in cash and cash equivalents	(10,684)	(15,794)	(12,321)
Cash and cash equivalents at beginning of year	39,228	55,022	67,343
Cash and cash equivalents at end of year	28,544	39,228	55,022
Middleburg Financial Corporation [Member]
Cash Flows from Operating Activities
Net income	8,064	7,830	7,584
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(3,915)	(3,767)	(5,138)
Share-based compensation	925	605	426
(Increase) decrease in other assets	(1,469)	957	(1,099)
(Decrease) increase in other liabilities	(67)	13	213
Net cash provided by operating activities	3,538	5,638	1,986
Cash Flows from Investing Activities
Proceeds from maturity, calls, principal repayments and sales of securities available for sale	0	0	44
Net cash provided by (used in) investing activities	0	0	44
Cash Flows from Financing Activities
Net proceeds from issuance of common stock	1,742	0	394
Cash dividends paid on common stock	(3,701)	(3,292)	(2,419)
Repurchases of stock	(828)	(1,506)	(88)
Net cash provided by (used in) provided by financing activities	(2,787)	(4,798)	(2,113)
Decrease in cash and cash equivalents	751	840	(83)
Cash and cash equivalents at beginning of year	1,403	563	646
Cash and cash equivalents at end of year	$ 2,154	$ 1,403	$ 563