BORROWINGS (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Securities pledged as collateral for customer repurchase agreements	$ 53,700,000	$ 51,800,000
Remaining available balance for the federal funds lines	175,000,000	150,000,000
Maximum collateral dependent line of credit with the FHLB	1,500,000,000	1,400,000,000
Prepayment penalty	19,600,000
Prepayment penalty amortization expense	447,000	436,000
Carrying value of the loans and securities pledged as collateral for FHLB	1,700,000,000	1,600,000,000
Acquisitions, Prior To 2006 [Member]
Number of bank acquisitions	2
Trust preferred capital notes principal balance	58,500,000
Remaining fair value discount on subordinated debt	530,000
Subordinated debt interest rate basis	LIBOR plus 1.45%
Subordinated debt maturity date	Apr. 01, 2016
Subordinated debt	17,500,000
LIBOR [Member] | Acquisitions, Prior To 2006 [Member]
Spread on 3-Month LIBOR	1.45%
StellarOne Bank [Member]
Trust preferred capital notes principal balance	32,000,000
Remaining fair value discount on acquired trust preferred capital notes	7,200,000
Loans from Other Federal Home Loan Banks	70,000,000
Remaining fair value premium on acquired FHLB advances	$ 1,900,000