LOANS - Summary of loans by modified as troubled debt restructurings of payment default (Details) - Trouble debt restructuring $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	14	4	2
Recorded Investment | $	$ 15,881	$ 4,082	$ 302
Commercial financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	10	2	0
Recorded Investment | $	$ 458	$ 663
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	4	2	2
Recorded Investment | $	$ 15,423	$ 3,419	$ 302