LOANS - Analysis of Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	$ 31,779	$ 35,174	$ 34,491	$ 31,779	$ 34,491	$ 35,174
Recorded Investment With No Allowance	7,245	9,253	7,797	7,245	7,797	9,253
Recorded Investment With Allowance	20,532	23,070	22,786	20,532	22,786	23,070
Total impaired loans	27,777	32,323	30,583	27,777	30,583	32,323
Related Allowance	2,324	4,995	4,182	2,324	4,182	4,995
Average recorded investment	28,516	32,252	30,691	30,324	30,686	31,506
Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	53,652	92,830	97,454	53,652	97,454	92,830
Recorded Investment With No Allowance	10,362	12,368	10,354	10,362	10,354	12,368
Recorded Investment With Allowance	28,892	34,141	34,590	28,892	34,590	34,141
Total impaired loans	39,254	46,509	44,944	39,254	44,944	46,509
Related Allowance	3,239	1,626	1,521	3,239	1,521	1,626
Average recorded investment	38,817	45,729	46,163	42,049	48,893	49,616
Commercial, financial and agricultural | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	2,924	3,068	2,568	2,924	2,568	3,068
Recorded Investment With No Allowance	1,121	204	252	1,121	252	204
Recorded Investment With Allowance	1,331	1,656	1,114	1,331	1,114	1,656
Total impaired loans	2,452	1,860	1,366	2,452	1,366	1,860
Related Allowance	379	134	118	379	118	134
Average recorded investment	2,478	1,613	1,736	2,380	1,640	1,684
Commercial, financial and agricultural | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	5,333	5,031	5,097	5,333	5,097	5,031
Recorded Investment With No Allowance	345	370	648	345	648	370
Recorded Investment With Allowance	1,741	322	225	1,741	225	322
Total impaired loans	2,086	692	873	2,086	873	692
Related Allowance	800	0	0	800	0	0
Average recorded investment	1,128	783	838	831	2,251	2,206
Real estate – construction and development | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	1,655	2,047	2,972	1,655	2,972	2,047
Recorded Investment With No Allowance	532	0	0	532	0	0
Recorded Investment With Allowance	627	1,233	1,946	627	1,946	1,233
Total impaired loans	1,159	1,233	1,946	1,159	1,946	1,233
Related Allowance	81	273	537	81	537	273
Average recorded investment	1,179	1,590	2,001	1,160	2,214	2,018
Real estate – construction and development | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	9,268	24,566	24,253	9,268	24,253	24,566
Recorded Investment With No Allowance	1,189	493	296	1,189	296	493
Recorded Investment With Allowance	3,088	3,477	3,509	3,088	3,509	3,477
Total impaired loans	4,277	3,970	3,805	4,277	3,805	3,970
Related Allowance	537	153	184	537	184	153
Average recorded investment	3,885	3,888	3,946	3,807	4,075	4,279
Real estate – commercial and farmland | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	11,451	13,906	14,015	11,451	14,015	13,906
Recorded Investment With No Allowance	536	6,811	5,499	536	5,499	6,811
Recorded Investment With Allowance	9,938	6,065	7,520	9,938	7,520	6,065
Total impaired loans	10,474	12,876	13,019	10,474	13,019	12,876
Related Allowance	806	1,503	873	806	873	1,503
Average recorded investment	10,669	12,948	12,776	11,416	12,837	12,845
Real estate – commercial and farmland | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	16,492	36,174	41,098	16,492	41,098	36,174
Recorded Investment With No Allowance	1,516	3,598	1,861	1,516	1,861	3,598
Recorded Investment With Allowance	11,766	15,036	15,116	11,766	15,116	15,036
Total impaired loans	13,282	18,634	16,977	13,282	16,977	18,634
Related Allowance	1,140	385	402	1,140	402	385
Average recorded investment	13,658	17,806	18,196	16,063	19,569	19,872
Real estate – residential | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	15,211	15,482	14,350	15,211	14,350	15,482
Recorded Investment With No Allowance	4,558	2,238	2,046	4,558	2,046	2,238
Recorded Investment With Allowance	8,636	13,503	11,667	8,636	11,667	13,503
Total impaired loans	13,194	15,741	13,713	13,194	13,713	15,741
Related Allowance	1,058	3,080	2,648	1,058	2,648	3,080
Average recorded investment	13,683	15,525	13,686	14,814	13,516	14,453
Real estate – residential | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	22,462	27,022	26,908	22,462	26,908	27,022
Recorded Investment With No Allowance	7,224	7,883	7,473	7,224	7,473	7,883
Recorded Investment With Allowance	12,297	15,306	15,740	12,297	15,740	15,306
Total impaired loans	19,521	23,189	23,213	19,521	23,213	23,189
Related Allowance	762	1,088	935	762	935	1,088
Average recorded investment	20,088	23,201	23,103	21,308	22,893	23,163
Consumer installment | Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	538	671	586	538	586	671
Recorded Investment With No Allowance	498	0	0	498	0	0
Recorded Investment With Allowance	0	613	539	0	539	613
Total impaired loans	498	613	539	498	539	613
Related Allowance	0	5	6	0	6	5
Average recorded investment	507	576	492	554	479	506
Consumer installment | Purchased Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	97	37	98	97	98	37
Recorded Investment With No Allowance	88	24	76	88	76	24
Recorded Investment With Allowance	0	0	0	0	0	0
Total impaired loans	88	24	76	88	76	24
Related Allowance	0	0	0	0	0	0
Average recorded investment	$ 58	$ 51	$ 80	$ 40	$ 105	$ 96