Borrowings (Junior Subordinated Debentures) (Details) (USD $)	12 Months Ended						1 Months Ended
	Dec. 31, 2013 Junior Subordinated Debt [Member]	Dec. 31, 2012 Junior Subordinated Debt [Member]	Dec. 31, 2011 Junior Subordinated Debt [Member]	Dec. 31, 2013 Junior Subordinated Debt [Member] Union Bankshares Capital Trust I [Member]	Dec. 31, 2006 Junior Subordinated Debt [Member] Union Bankshares Capital Trust I [Member]	Dec. 31, 2008 Junior Subordinated Debt [Member] Union Bankshares Capital Trust I [Member]	Apr. 30, 2006 Junior Subordinated Debt [Member] Subsidiary One [Member]	Dec. 31, 2013 Junior Subordinated Debt [Member] Subsidiary One [Member]	Jun. 30, 2011 Junior Subordinated Debt [Member] Subsidiary One [Member]	Dec. 31, 2013 Interest rate swaps	Dec. 31, 2012 Interest rate swaps
Debt Instrument [Line Items]
Proceeds from issuance of trust preferred securities							$ 36,100,000
Debt instrument, interest rate									6.71%
Value of outstanding common shares of subsidiary owned by company				248,000				1,100,000
Debt instrument, interest rate terms					The interest rate of the trust preferred securities until April 7, 2011 was a blended rate equal to the sum of (1) the product of 50% times the average three-month LIBOR plus 1.42%, plus (2) the product of 50% times 6.4725%. The rate is now the average three-month LIBOR plus 1.42%.
Debt interest rate, additional rate over three month LIBOR				0.142%	0.14%
Trust preferred securities assumed in acquisition						8,000,000
Aggregate amount of junior subordinated debt issued to subsidiary by acquired company, prior to acquisition					8,200,000
Interest expense on junior subordinated debentures	2,500,000	2,500,000	2,600,000
Value of trust preferred securities included in Tier I Capital	43,000,000
Percentage of trust preferred securities included in Tier I Capital ratio	18.10%
Notional amount of derivative										$ 43,000,000	$ 43,000,000
Debt instrument fixed rate					6.4725%