LOANS - Analysis of Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	$ 30,203	$ 31,505	$ 31,936	$ 30,203	$ 31,936	$ 31,505
Recorded Investment With No Allowance	8,160	7,250	8,809	8,160	8,809	7,250
Recorded Investment With Allowance	19,676	20,551	20,443	19,676	20,443	20,551
Total Recorded Investment	27,836	27,801	29,252	27,836	29,252	27,801
Related Allowance	2,670	2,245	4,318	2,670	4,318	2,245
Average recorded investment	26,582	26,662	31,891	26,235	32,343	29,819
Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	69,076	48,750	51,217	69,076	51,217	48,750
Recorded Investment With No Allowance	25,231	8,198	10,779	25,231	10,779	8,198
Recorded Investment With Allowance	28,933	27,702	27,598	28,933	27,598	27,702
Total Recorded Investment	54,164	35,900	38,377	54,164	38,377	35,900
Related Allowance	2,338	3,241	1,791	2,338	1,791	3,241
Average recorded investment	37,963	37,578	41,217	37,274	42,979	40,817
Commercial, financial and agricultural | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	2,297	1,453	4,166	2,297	4,166	1,453
Recorded Investment With No Allowance	1,210	734	596	1,210	596	734
Recorded Investment With Allowance	568	613	1,907	568	1,907	613
Total Recorded Investment	1,778	1,347	2,503	1,778	2,503	1,347
Related Allowance	87	145	704	87	704	145
Average recorded investment	1,683	1,900	3,113	1,571	2,695	2,173
Commercial, financial and agricultural | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	5,945	4,170	1,679	5,945	1,679	4,170
Recorded Investment With No Allowance	1,522	70	163	1,522	163	70
Recorded Investment With Allowance	80	744	6	80	6	744
Total Recorded Investment	1,602	814	169	1,602	169	814
Related Allowance	1	400	0	1	0	400
Average recorded investment	582	1,450	273	659	412	827
Real estate – construction and development | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	850	1,467	1,733	850	1,733	1,467
Recorded Investment With No Allowance	679	471	119	679	119	471
Recorded Investment With Allowance	119	500	1,080	119	1,080	500
Total Recorded Investment	798	971	1,199	798	1,199	971
Related Allowance	1	48	179	1	179	48
Average recorded investment	746	1,065	1,123	821	1,160	1,122
Real estate – construction and development | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	16,715	9,060	8,296	16,715	8,296	9,060
Recorded Investment With No Allowance	7,210	282	524	7,210	524	282
Recorded Investment With Allowance	3,359	3,875	2,967	3,359	2,967	3,875
Total Recorded Investment	10,569	4,157	3,491	10,569	3,491	4,157
Related Allowance	521	1,114	257	521	257	1,114
Average recorded investment	4,962	4,218	3,491	4,693	3,650	3,877
Real estate – commercial and farmland | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	10,168	10,646	11,885	10,168	11,885	10,646
Recorded Investment With No Allowance	665	729	5,940	665	5,940	729
Recorded Investment With Allowance	8,149	8,873	4,923	8,149	4,923	8,873
Total Recorded Investment	8,814	9,602	10,863	8,814	10,863	9,602
Related Allowance	1,526	1,047	1,436	1,526	1,436	1,047
Average recorded investment	8,488	8,910	11,156	8,107	11,730	11,053
Real estate – commercial and farmland | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	17,039	14,596	16,987	17,039	16,987	14,596
Recorded Investment With No Allowance	4,298	1,224	2,418	4,298	2,418	1,224
Recorded Investment With Allowance	10,705	11,173	11,616	10,705	11,616	11,173
Total Recorded Investment	15,003	12,397	14,034	15,003	14,034	12,397
Related Allowance	1,088	906	771	1,088	771	906
Average recorded investment	11,161	12,840	16,167	11,573	16,989	15,329
Real estate – residential | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	16,340	17,416	13,569	16,340	13,569	17,416
Recorded Investment With No Allowance	5,088	4,828	2,154	5,088	2,154	4,828
Recorded Investment With Allowance	10,840	10,565	12,017	10,840	12,017	10,565
Total Recorded Investment	15,928	15,393	14,171	15,928	14,171	15,393
Related Allowance	1,056	1,005	1,994	1,056	1,994	1,005
Average recorded investment	15,158	14,294	15,946	15,236	16,186	14,930
Real estate – residential | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	29,145	20,867	24,219	29,145	24,219	20,867
Recorded Investment With No Allowance	12,017	6,574	7,647	12,017	7,647	6,574
Recorded Investment With Allowance	14,789	11,910	13,009	14,789	13,009	11,910
Total Recorded Investment	26,806	18,484	20,656	26,806	20,656	18,484
Related Allowance	728	821	763	728	763	821
Average recorded investment	21,196	19,002	21,262	20,292	21,904	20,743
Consumer installment | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	548	523	583	548	583	523
Recorded Investment With No Allowance	518	488	0	518	0	488
Recorded Investment With Allowance	0	0	516	0	516	0
Total Recorded Investment	518	488	516	518	516	488
Related Allowance	0	0	5	0	5	0
Average recorded investment	507	493	553	500	572	541
Consumer installment | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	232	57	36	232	36	57
Recorded Investment With No Allowance	184	48	27	184	27	48
Recorded Investment With Allowance	0	0	0	0	0	0
Total Recorded Investment	184	48	27	184	27	48
Related Allowance	0	0	0	0	0	0
Average recorded investment	$ 62	$ 68	$ 24	$ 57	$ 24	$ 41