FDIC-ASSISTED ACQUIRED LOANS (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Jun. 09, 2017	Apr. 26, 2016	Jun. 20, 2014
Business Acquisition [Line Items]
Goodwill recorded on acquisition date	$ 6,655,000	$ 6,944,000
TeamBank
Business Acquisition [Line Items]
Gross loans receivable	5,070,000	5,393,000
Balance of accretable discount due to change in expected losses	(88,000)	(97,000)
Expected loss remaining		(30,000)
Net carrying value of loans receivable	4,982,000	5,266,000
Goodwill recorded on acquisition date				$ 0
Vantus Bank
Business Acquisition [Line Items]
Gross loans receivable	6,786,000	8,052,000
Balance of accretable discount due to change in expected losses	(31,000)	(35,000)
Expected loss remaining		(13,000)
Net carrying value of loans receivable	6,755,000	8,004,000
Goodwill recorded on acquisition date				0
Sun Security Bank
Business Acquisition [Line Items]
Gross loans receivable	11,913,000	13,395,000
Balance of accretable discount due to change in expected losses	(124,000)	(180,000)
Expected loss remaining		(104,000)
Net carrying value of loans receivable	11,789,000	13,111,000
Goodwill recorded on acquisition date				$ 0
InterBank
Business Acquisition [Line Items]
Gross loans receivable	41,278,000	44,215,000
Balance of accretable discount due to change in expected losses	(614,000)	(1,079,000)
Expected loss remaining		(1,079,000)
Net carrying value of loans receivable	40,664,000	42,057,000
Goodwill recorded on acquisition date			$ 0
Valley Bank
Business Acquisition [Line Items]
Gross loans receivable	28,201,000	31,515,000
Balance of accretable discount due to change in expected losses	(457,000)	(612,000)
Expected loss remaining		(699,000)
Net carrying value of loans receivable	$ 27,744,000	$ 30,204,000
Goodwill recorded on acquisition date					$ 0