LOANS - Summary of loans by modified as troubled debt restructurings of payment default (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	5	16
Recorded Investment | $	$ 2,294	$ 17,852
Commercial financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan		3
Recorded Investment | $		$ 427
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	4	11
Recorded Investment | $	$ 2,291	$ 17,267
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan		2
Recorded Investment | $		$ 158
Consumer installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	1
Recorded Investment | $	$ 3