LOANS AND ALLOWANCE FOR LOAN LOSSES - Loans by Class Modified as Troubled Debt Restructurings (Details) $ in Thousands	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	34	33
Troubled debt restructurings not included above | $	$ 4,779	$ 2,256
Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	31	34
Troubled debt restructurings not included above | $	$ 3,725	$ 2,499
Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	17	33
Troubled debt restructurings not included above | $	$ 1,946	$ 1,298
Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	23	26
Troubled debt restructurings not included above | $	$ 2,247	$ 2,471
Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	106	99
Troubled debt restructurings not included above | $	$ 11,646	$ 9,323
Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	128	132
Troubled debt restructurings not included above | $	$ 17,963	$ 18,740
Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	36	43
Troubled debt restructurings not included above | $	$ 3,141	$ 3,451
Non-Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	59	62
Troubled debt restructurings not included above | $	$ 2,482	$ 1,754
Commercial, financial and agricultural | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5	11
Troubled debt restructurings not included above | $	$ 784	$ 348
Commercial, financial and agricultural | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	4
Troubled debt restructurings not included above | $	$ 0	$ 63
Commercial, financial and agricultural | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	8
Troubled debt restructurings not included above | $	$ 81	$ 107
Commercial, financial and agricultural | Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	0
Troubled debt restructurings not included above | $	$ 6	$ 0
Commercial, financial and agricultural | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	1
Troubled debt restructurings not included above | $	$ 30	$ 31
Commercial, financial and agricultural | Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5	5
Troubled debt restructurings not included above | $	$ 642	$ 256
Commercial, financial and agricultural | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	3
Troubled debt restructurings not included above | $	$ 23	$ 32
Commercial, financial and agricultural | Non-Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	14	14
Troubled debt restructurings not included above | $	$ 312	$ 138
Real estate – construction and development | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	1
Troubled debt restructurings not included above | $	$ 0	$ 3
Real estate – construction and development | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings not included above | $	$ 0	$ 0
Real estate – construction and development | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	1
Troubled debt restructurings not included above | $	$ 2	$ 0
Real estate – construction and development | Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings not included above | $	$ 0	$ 0
Real estate – construction and development | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	4
Troubled debt restructurings not included above | $	$ 872	$ 1,015
Real estate – construction and development | Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	5
Troubled debt restructurings not included above | $	$ 64	$ 145
Real estate – construction and development | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	5
Troubled debt restructurings not included above | $	$ 252	$ 293
Real estate – construction and development | Non-Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	1
Troubled debt restructurings not included above | $	$ 1	$ 2
Real estate – commercial and farmland | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	2
Troubled debt restructurings not included above | $	$ 220	$ 440
Real estate – commercial and farmland | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	1
Troubled debt restructurings not included above | $	$ 0	$ 71
Real estate – commercial and farmland | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	1
Troubled debt restructurings not included above | $	$ 794	$ 246
Real estate – commercial and farmland | Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	1
Troubled debt restructurings not included above | $	$ 1,148	$ 71
Real estate – commercial and farmland | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	9	12
Troubled debt restructurings not included above | $	$ 3,992	$ 6,162
Real estate – commercial and farmland | Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	12	12
Troubled debt restructurings not included above | $	$ 2,740	$ 2,863
Real estate – commercial and farmland | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6	7
Troubled debt restructurings not included above | $	$ 1,712	$ 1,685
Real estate – commercial and farmland | Non-Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	3
Troubled debt restructurings not included above | $	$ 359	$ 426
Real estate – residential | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	20	13
Troubled debt restructurings not included above | $	$ 3,751	$ 1,430
Real estate – residential | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	28	27
Troubled debt restructurings not included above | $	$ 3,691	$ 2,351
Real estate – residential | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6	16
Troubled debt restructurings not included above | $	$ 1,052	$ 911
Real estate – residential | Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	17	25
Troubled debt restructurings not included above | $	$ 1,078	$ 2,400
Real estate – residential | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	114	115
Troubled debt restructurings not included above | $	$ 13,069	$ 11,532
Real estate – residential | Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	83	71
Troubled debt restructurings not included above | $	$ 8,192	$ 6,043
Real estate – residential | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	19	24
Troubled debt restructurings not included above | $	$ 1,106	$ 1,424
Real estate – residential | Non-Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	21	20
Troubled debt restructurings not included above | $	$ 1,751	$ 1,119
Consumer installment | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	7	6
Troubled debt restructurings not included above | $	$ 24	$ 35
Consumer installment | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	2
Troubled debt restructurings not included above | $	$ 34	$ 14
Consumer installment | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	7
Troubled debt restructurings not included above | $	$ 17	$ 34
Consumer installment | Financing Receivables, 1 to 29 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	0
Troubled debt restructurings not included above | $	$ 15	$ 0
Consumer installment | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings not included above | $	$ 0	$ 0
Consumer installment | Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	6
Troubled debt restructurings not included above | $	$ 8	$ 16
Consumer installment | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6	4
Troubled debt restructurings not included above | $	$ 48	$ 17
Consumer installment | Non-Accruing Loans | Financing Receivables, 1 to 29 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	21	24
Troubled debt restructurings not included above | $	$ 59	$ 69