LOANS - Loans by Class Modified as Troubled Debt Restructurings (Details) $ in Thousands	Jun. 30, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract	Jun. 30, 2017 USD ($) contract
Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	22		11
Troubled debt restructuring loans | $	$ 1,770		$ 1,170
Purchased Loans By Class Modified
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	12		9
Troubled debt restructuring loans | $	$ 991		$ 1,907
Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	22		22
Troubled debt restructuring loans | $	$ 1,092		$ 992
Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	21		7
Troubled debt restructuring loans | $	$ 1,580		$ 373
Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	104	105
Troubled debt restructuring loans | $	$ 11,023	$ 13,599
Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	140	134
Troubled debt restructuring loans | $	$ 20,607	$ 20,472
Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	69	70
Troubled debt restructuring loans | $	$ 1,367	$ 1,964
Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	40	46
Troubled debt restructuring loans | $	$ 3,734	$ 4,405
Commercial, financial and agricultural | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6		0
Troubled debt restructuring loans | $	$ 238		$ 0
Commercial, financial and agricultural | Purchased Loans By Class Modified
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1		1
Troubled debt restructuring loans | $	$ 6		$ 6
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		2
Troubled debt restructuring loans | $	$ 0		$ 49
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		1
Troubled debt restructuring loans | $	$ 0		$ 6
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	4
Troubled debt restructuring loans | $	$ 38	$ 41
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0
Troubled debt restructuring loans | $	$ 0	$ 0
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	14	12
Troubled debt restructuring loans | $	$ 330	$ 120
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	3
Troubled debt restructuring loans | $	$ 21	$ 16
Real estate – construction and development | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1		0
Troubled debt restructuring loans | $	$ 3		$ 0
Real estate – construction and development | Purchased Loans By Class Modified
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		0
Troubled debt restructuring loans | $	$ 0		$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		0
Troubled debt restructuring loans | $	$ 0		$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		0
Troubled debt restructuring loans | $	$ 0		$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	6
Troubled debt restructuring loans | $	$ 150	$ 417
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	3
Troubled debt restructuring loans | $	$ 1,028	$ 1,018
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	2
Troubled debt restructuring loans | $	$ 30	$ 34
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6	6
Troubled debt restructuring loans | $	$ 308	$ 340
Real estate – commercial and farmland | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1		4
Troubled debt restructuring loans | $	$ 302		$ 1,062
Real estate – commercial and farmland | Purchased Loans By Class Modified
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		4
Troubled debt restructuring loans | $	$ 0		$ 1,323
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4		4
Troubled debt restructuring loans | $	$ 11		$ 362
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		1
Troubled debt restructuring loans | $	$ 0		$ 226
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	16	17
Troubled debt restructuring loans | $	$ 4,531	$ 6,937
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	14	14
Troubled debt restructuring loans | $	$ 6,679	$ 6,713
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5	5
Troubled debt restructuring loans | $	$ 196	$ 204
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	8	10
Troubled debt restructuring loans | $	$ 2,161	$ 2,582
Real estate – residential | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	8		1
Troubled debt restructuring loans | $	$ 1,189		$ 77
Real estate – residential | Purchased Loans By Class Modified
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	11		4
Troubled debt restructuring loans | $	$ 985		$ 578
Real estate – residential | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	18		9
Troubled debt restructuring loans | $	$ 1,081		$ 554
Real estate – residential | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	21		4
Troubled debt restructuring loans | $	$ 1,580		$ 138
Real estate – residential | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	77	74
Troubled debt restructuring loans | $	$ 6,299	$ 6,199
Real estate – residential | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	122	117
Troubled debt restructuring loans | $	$ 12,900	$ 12,741
Real estate – residential | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	16	18
Troubled debt restructuring loans | $	$ 709	$ 1,508
Real estate – residential | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	20	25
Troubled debt restructuring loans | $	$ 1,241	$ 1,462
Consumer installment | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	6		6
Troubled debt restructuring loans | $	$ 38		$ 31
Consumer installment | Purchased Loans By Class Modified
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		0
Troubled debt restructuring loans | $	$ 0		$ 0
Consumer installment | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		7
Troubled debt restructuring loans | $	$ 0		$ 27
Consumer installment | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0		1
Troubled debt restructuring loans | $	$ 0		$ 3
Consumer installment | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	4
Troubled debt restructuring loans | $	$ 5	$ 5
Consumer installment | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0
Troubled debt restructuring loans | $	$ 0	$ 0
Consumer installment | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	31	33
Troubled debt restructuring loans | $	$ 102	$ 98
Consumer installment | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	2
Troubled debt restructuring loans | $	$ 3	$ 5