Borrowings (Junior Subordinated Debentures) (Details) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2006	Dec. 31, 2006	Dec. 31, 2008
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Interest expense on junior subordinated debentures	$ 2,500,000	$ 2,500,000	$ 2,500,000
Value of trust preferred securities included in Tier I Capital	43,000,000
Percentage of trust preferred securities included in Tier I Capital ratio	17.30%
Junior Subordinated Debt [Member] | Subsidiary One [Member]
Debt Instrument [Line Items]
Proceeds from issuance of trust preferred securities				36,100,000
Value of outstanding common shares of subsidiary owned by company				1,100,000
Debt instrument, interest rate				6.71%
Debt instrument, interest rate terms				now floats at the 3 month LIBOR plus 140 basis points
Debt interest rate, additional rate over three month LIBOR				1.40%
Junior Subordinated Debt [Member] | Union Bankshares Capital Trust I [Member]
Debt Instrument [Line Items]
Value of outstanding common shares of subsidiary owned by company					248,000
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					1.42%
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
Debt Instrument, Term					30 years
Debt instrument fixed rate					6.4725%
interest rate multiplier applied to variable rate					50.00%
interest rate multiplier applied to fixed rate					50.00%
Interest rate swaps
Debt Instrument [Line Items]
Notional amount of derivative	$ 43,000,000	$ 43,000,000