ACQUISITIONS (Details)		3 Months Ended
	May 15, 2020 USD ($)	Sep. 30, 2020 item Office	Dec. 31, 2020 USD ($)	Feb. 10, 2020 item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 4,500,000		$ 24,191,000		$ 19,686,000	$ 24,811,000
Simmons Bank
Business Acquisition [Line Items]
Number of branches acquired | item				3
Number of branches closed | item		2
Loan production offices acquired | item				1
Loan production offices closed | Office		1
Purchase consideration	$ 61,599,000
Deposit premium	6.06%
Goodwill	$ 4,505,000
Loans, net	119,552,000
Contractual balance	120,600,000
Discount on loans	$ 1,100,000
Discount on loans (in percent)	0.90%
Allowance for Loan and Lease Losses, Loans Acquired	$ 0