JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS - Interest rate and maturities (Details)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Heartland Bancorp, Inc. Capital Trust B
SUBORDINATED NOTES
Spread on interest rate basis	3.01%
Interest Rate	8.32%	6.83%
Heartland Bancorp, Inc. Capital Trust C
SUBORDINATED NOTES
Spread on interest rate basis	1.79%
Interest Rate	7.20%	6.30%
Heartland Bancorp, Inc. Capital Trust D
SUBORDINATED NOTES
Spread on interest rate basis	1.61%
Interest Rate	7.02%	6.12%
FFBI Capital Trust I
SUBORDINATED NOTES
Spread on interest rate basis	3.06%
Interest Rate	8.37%	6.88%
National Bancorp Statutory Trust I
SUBORDINATED NOTES
Spread on interest rate basis	3.16%
Interest Rate	8.57%	7.67%
Town and Country Statutory Trust II
SUBORDINATED NOTES
Spread on interest rate basis	3.05%
Interest Rate	8.46%
Town and Country Statutory Trust III
SUBORDINATED NOTES
Spread on interest rate basis	1.94%
Interest Rate	7.35%
West Plains Investors Statutory Trust I
SUBORDINATED NOTES
Spread on interest rate basis	1.71%
Interest Rate	7.12%