LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) loan	Mar. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Unpaid principal balance of loans	$ 25,978,000		$ 25,978,000		$ 17,370,000
Accretable discount on the acquired covered loans	972,000	$ 1,100,000	1,800,000	$ 2,200,000
Total loans	2,172,631,000		2,172,631,000		2,178,961,000
Loans reclassified within portfolio classifications						$ 33,900,000
Accretable discount on acquired EVBS, GAB, PGFSB and HarVest loans	$ 13,300,000		13,300,000		$ 15,100,000
TDRs during period | loan	2				1
Mortgage loans on real estate, foreclosures			1,200,000		$ 1,200,000
Mortgage loans in process of foreclosure, amount	$ 500,000		500,000		1,500,000
SBA guaranteed amounts included in nonaccrual loans	3,200,000		3,200,000		3,400,000
Mortgage loans trouble debt restructured current amount	655,000		655,000
Doubtful [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	0		0		0
GAB acquisition [Member]
Accounts Notes And Loans Receivable [Line Items]
Loss sharing agreement							$ 143,400,000
Total loans	$ 15,800,000		$ 15,800,000		$ 18,300,000