JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS - Interest rate and maturities (Details) - Junior Subordinated Debentures Issued	24 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Heartland Bancorp, Inc. Capital Trust B
SUBORDINATED NOTES
Interest Rate	2.87%	2.99%
Heartland Bancorp, Inc. Capital Trust B | LIBOR
SUBORDINATED NOTES
Spread on interest rate basis	2.75%
Heartland Bancorp, Inc. Capital Trust C
SUBORDINATED NOTES
Interest Rate	1.73%	1.75%
Heartland Bancorp, Inc. Capital Trust C | LIBOR
SUBORDINATED NOTES
Spread on interest rate basis	1.53%
Heartland Bancorp, Inc. Capital Trust D
SUBORDINATED NOTES
Interest Rate	1.55%	1.57%
Heartland Bancorp, Inc. Capital Trust D | LIBOR
SUBORDINATED NOTES
Spread on interest rate basis	1.35%
FFBI Capital Trust I
SUBORDINATED NOTES
Interest Rate	2.92%	3.04%
FFBI Capital Trust I | LIBOR
SUBORDINATED NOTES
Spread on interest rate basis	2.80%
National Bancorp Statutory Trust I
SUBORDINATED NOTES
Interest Rate	3.10%	3.12%
National Bancorp Statutory Trust I | LIBOR
SUBORDINATED NOTES
Spread on interest rate basis	2.90%