LOANS AND ALLOWANCE FOR LOAN LOSSES - Risk ratings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	$ 1,259,046	$ 1,143,575
Pass
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	1,241,846	1,127,031
Special Mention
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income		5,112
Substandard
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	17,200	11,432
Construction and development
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	41,676	42,288
Construction and development | Pass
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	40,316	40,928
Construction and development | Substandard
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	1,360	1,360
Commercial real estate
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	434,882	394,963
Commercial real estate | Pass
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	428,022	383,857
Commercial real estate | Special Mention
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income		5,112
Commercial real estate | Substandard
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	6,860	5,994
Commercial and industrial
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	47,128	33,026
Commercial and industrial | Pass
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	46,131	32,040
Commercial and industrial | Substandard
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	997	986
Residential real estate
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	733,702	670,341
Residential real estate | Pass
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	725,719	667,249
Residential real estate | Substandard
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	7,983	3,092
Consumer and Other
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	1,658	2,957
Consumer and Other | Pass
Loans credit quality indicator
Loans and Leases Receivable, Net of Deferred Income	$ 1,658	$ 2,957