LOANS - Summary of loans by modified as troubled debt restructurings of payment default (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan
Trouble debt restructuring
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	4	11
Recorded Investment | $	$ 1,071	$ 15,337
Commercial financial and agriculture | Trouble debt restructuring | Commercial financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan		2
Recorded Investment | $		$ 254
Commercial real estate | Trouble debt restructuring | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	3	9
Recorded Investment | $	$ 1,027	$ 15,083
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans | loan	1
Recorded Investment | $	$ 44