LOANS - Loans by Class Modified as Troubled Debt Restructurings (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract	Dec. 31, 2018 USD ($) contract
Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	25	22
Troubled debt restructurings principal balances	$ 3,991	$ 1,770
Purchased Loans By Class Modified
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	22	12
Troubled debt restructurings principal balances	$ 1,277	$ 991
Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings principal balances	$ 1,300	$ 991
Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	8	22
Troubled debt restructurings principal balances	$ 869	$ 1,092
Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	17	21
Troubled debt restructurings principal balances	$ 992	$ 1,580
Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	111		99
Troubled debt restructurings principal balances	$ 12,952		$ 9,323
Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	131		132
Troubled debt restructurings principal balances	$ 18,430		$ 18,740
Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	61		62
Troubled debt restructurings principal balances	$ 1,570		$ 1,754
Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	38		43
Troubled debt restructurings principal balances	$ 2,849		$ 3,451
Commercial, financial and agricultural | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	6
Troubled debt restructurings principal balances	$ 197	$ 238
Commercial, financial and agricultural | Purchased Loans By Class Modified
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	1
Troubled debt restructurings principal balances	$ 0	$ 6
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	0
Troubled debt restructurings principal balances	$ 3	$ 0
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	0
Troubled debt restructurings principal balances	$ 1	$ 0
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	4		5
Troubled debt restructurings principal balances	$ 300		$ 256
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1		1
Troubled debt restructurings principal balances	$ 31		$ 31
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	14		14
Troubled debt restructurings principal balances	$ 136		$ 138
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	3		3
Troubled debt restructurings principal balances	$ 26		$ 32
Real estate – construction and development | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	1
Troubled debt restructurings principal balances	$ 0	$ 3
Real estate – construction and development | Purchased Loans By Class Modified
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings principal balances	$ 0	$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings principal balances	$ 0	$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings principal balances	$ 0	$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	4		5
Troubled debt restructurings principal balances	$ 138		$ 145
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	4		4
Troubled debt restructurings principal balances	$ 986		$ 1,015
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1		1
Troubled debt restructurings principal balances	$ 2		$ 2
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	3		5
Troubled debt restructurings principal balances	$ 263		$ 293
Real estate – commercial and farmland | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	1
Troubled debt restructurings principal balances	$ 214	$ 302
Real estate – commercial and farmland | Purchased Loans By Class Modified
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings principal balances	$ 0	$ 0
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	4
Troubled debt restructurings principal balances	$ 0	$ 11
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0
Troubled debt restructurings principal balances	$ 0	$ 0
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	13		12
Troubled debt restructurings principal balances	$ 2,911		$ 2,863
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	11		12
Troubled debt restructurings principal balances	$ 5,882		$ 6,162
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	4		3
Troubled debt restructurings principal balances	$ 576		$ 426
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	6		7
Troubled debt restructurings principal balances	$ 1,533		$ 1,685
Real estate – residential | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	16	8
Troubled debt restructurings principal balances	$ 3,560	$ 1,189
Real estate – residential | Purchased Loans By Class Modified
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	18	11
Troubled debt restructurings principal balances	$ 1,234	$ 985
Real estate – residential | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	4	18
Troubled debt restructurings principal balances	$ 857	$ 1,081
Real estate – residential | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	15	21
Troubled debt restructurings principal balances	$ 976	$ 1,580
Real estate – residential | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	85		71
Troubled debt restructurings principal balances	$ 9,593		$ 6,043
Real estate – residential | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	115		115
Troubled debt restructurings principal balances	$ 11,531		$ 11,532
Real estate – residential | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	20		20
Troubled debt restructurings principal balances	$ 791		$ 1,119
Real estate – residential | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	19		24
Troubled debt restructurings principal balances	$ 969		$ 1,424
Consumer installment | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	5	6
Troubled debt restructurings principal balances	$ 20	$ 38
Consumer installment | Purchased Loans By Class Modified
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	4	0
Troubled debt restructurings principal balances	$ 43	$ 0
Consumer installment | Financing Receivables, 30 Days Past Due | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	3	0
Troubled debt restructurings principal balances	$ 9	$ 0
Consumer installment | Financing Receivables, 30 Days Past Due | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	0
Troubled debt restructurings principal balances	$ 15	$ 0
Consumer installment | Financing Receivables, 30 Days Past Due | Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	5		6
Troubled debt restructurings principal balances	$ 10		$ 16
Consumer installment | Financing Receivables, 30 Days Past Due | Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0		0
Troubled debt restructurings principal balances	$ 0		$ 0
Consumer installment | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Loans Excluding Purchased Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	22		24
Troubled debt restructurings principal balances	$ 65		$ 69
Consumer installment | Financing Receivables, 30 Days Past Due | Non-Accruing Loans | Purchased Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	7		4
Troubled debt restructurings principal balances	$ 58		$ 17