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ACQUISITIONS - Fair Value (Details) - USD ($) $ in Thousands		3 Months Ended
	May 15, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Liabilities assumed
Goodwill		$ 24,191	$ 19,686	$ 23,239	$ 24,811
Total gross loans		1,424,160	996,559
Cash, Securities and Other
Liabilities assumed
Total gross loans		371,111	146,701
Construction and Development
Liabilities assumed
Total gross loans		74,793	28,120
1-4 Family Residential
Liabilities assumed
Total gross loans		418,409	400,134
Non-Owner Occupied CRE
Liabilities assumed
Total gross loans		229,150	165,179
Owner Occupied CRE
Liabilities assumed
Total gross loans		117,426	127,968
Commercial and Industrial
Liabilities assumed
Total gross loans		213,271	$ 128,457
Simmons Bank
Business Acquisition [Line Items]
Cash consideration	$ 61,599
Total fair value of consideration transferred	61,599
Assets acquired
Cash and due from banks	283
Loans, net	119,552
Accrued income and other assets	382
Total assets acquired	120,270
Liabilities assumed
Deposits	63,080
Accrued expenses and other liabilities	96
Total liabilities assumed	63,176
Net assets acquired	57,094
Goodwill	4,505
Total gross loans	120,642	123,800
Acquisition cost		$ 300
Simmons Bank \| Cash, Securities and Other
Liabilities assumed
Total gross loans	13,457
Simmons Bank \| Construction and Development
Liabilities assumed
Total gross loans	40,407
Simmons Bank \| 1-4 Family Residential
Liabilities assumed
Total gross loans	7,252
Simmons Bank \| Non-Owner Occupied CRE
Liabilities assumed
Total gross loans	545
Simmons Bank \| Owner Occupied CRE
Liabilities assumed
Total gross loans	321
Simmons Bank \| Commercial and Industrial
Liabilities assumed
Total gross loans	58,660
Core deposit \| Simmons Bank
Assets acquired
Core deposit intangible	$ 53
Liabilities assumed
Estimated life	10 years