LOANS AND ALLOWANCE FOR LOAN LOSSES - Investment by portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans and allowance
Financing receivables	$ 659,973	$ 422,161
Remaining discount on financing receivables	11,824	7,313
Commercial and industrial
Loans and allowance
Financing receivables	14,414	13,875
Agricultural
Loans and allowance
Financing receivables	887	872
Farm
Loans and allowance
Financing receivables	3,045	389
Hotel
Loans and allowance
Financing receivables	10,044	2,983
Construction and development
Loans and allowance
Financing receivables	15,177	16,634
Other real estate
Loans and allowance
Financing receivables	334,990	164,505
1-4 family
Loans and allowance
Financing receivables	254,040	206,044
Home equity
Loans and allowance
Financing receivables	24,838	14,342
Direct
Loans and allowance
Financing receivables	$ 2,538	$ 2,517