BUSINESS COMBINATIONS - Assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Apr. 17, 2020	Dec. 31, 2019
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Goodwill	$ 41,914		$ 24,579
Branches located in western North Carolina
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents		$ 60,234
Loans		103,259
Premises and equipment		2,896
Accrued interest receivable		338
Core deposit intangible		620
Other assets		974
Total assets acquired		168,321
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Noninterest-bearing		41,398
Interest-bearing		144,085
Total deposits		185,483
Other liabilities		173
Total liabilities assumed		185,656
Goodwill		17,335
Branches located in western North Carolina | Previously Reported [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents		60,234
Loans		108,236
Premises and equipment		2,106
Accrued interest receivable		338
Total assets acquired		170,914
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Noninterest-bearing		41,398
Interest-bearing		144,845
Total deposits		186,243
Other liabilities		173
Total liabilities assumed		186,416
Branches located in western North Carolina | Revision of Prior Period, Adjustment [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Loans		(4,977)
Premises and equipment		790
Core deposit intangible		620
Other assets		974
Total assets acquired		(2,593)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Interest-bearing		(760)
Total deposits		(760)
Total liabilities assumed		$ (760)