LOANS - Detail of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	10	7	14
Outstanding Recorded Investment Pre-Modification	$ 573	$ 14,521	$ 1,553	$ 15,266
Outstanding Recorded Investment Post-Modification	$ 602	$ 14,514	$ 1,576	$ 15,245
Commercial financial and agriculture
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		3	2	5
Outstanding Recorded Investment Pre-Modification		$ 315	$ 47	$ 970
Outstanding Recorded Investment Post-Modification		$ 313	$ 46	$ 958
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	5	5	7
Outstanding Recorded Investment Pre-Modification	$ 573	$ 14,154	$ 1,506	$ 14,244
Outstanding Recorded Investment Post-Modification	$ 602	$ 14,154	$ 1,530	$ 14,240
Consumer | Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		1		1
Outstanding Recorded Investment Pre-Modification		$ 46		$ 46
Outstanding Recorded Investment Post-Modification		$ 41		$ 41
Consumer | Consumer installment
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		1		1
Outstanding Recorded Investment Pre-Modification		$ 6		$ 6
Outstanding Recorded Investment Post-Modification		$ 6		$ 6