LOANS - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for loan losses:
Balance at beginning of period	$ 28,064	$ 12,091	$ 13,908	$ 10,065
Provision for loan losses	6,921	974	21,628	2,888
Loans charged-off:	(934)	(201)	(2,303)	(382)
Recoveries	205	179	1,023	472
Balance at end of period	34,256	13,043	34,256	13,043
Commercial financial and agriculture
Allowance for loan losses:
Balance at beginning of period	5,208	2,432	3,043	2,060
Provision for loan losses	607	(82)	2,936	269
Loans charged-off:	(78)	(17)	(342)	(23)
Recoveries	37	24	137	51
Balance at end of period	5,774	2,357	5,774	2,357
Commercial real estate
Allowance for loan losses:
Balance at beginning of period	18,526	7,872	8,836	6,258
Provision for loan losses	5,371	787	15,096	2,454
Loans charged-off:	(769)	66	(1,165)
Recoveries	18	9	379	22
Balance at end of period	23,146	8,734	23,146	8,734
Consumer real estate
Allowance for loan losses:
Balance at beginning of period	3,741	1,489	1,694	1,743
Provision for loan losses	1,077	294	3,057	(19)
Loans charged-off:	(55)	(174)	(151)	(216)
Recoveries	17	64	180	165
Balance at end of period	4,780	1,673	4,780	1,673
Installment and Other
Allowance for loan losses:
Balance at beginning of period	459	250	296	201
Provision for loan losses	(4)	18	578	(18)
Loans charged-off:	(32)	(76)	(645)	(143)
Recoveries	133	82	327	234
Balance at end of period	556	274	556	274
Paycheck Protection Program
Allowance for loan losses:
Balance at beginning of period	130
Provision for loan losses	$ (130)
Unallocated
Allowance for loan losses:
Balance at beginning of period		48	39	(197)
Provision for loan losses		(43)	$ (39)	202
Balance at end of period		$ 5		$ 5