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JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS - Interest rate and maturities (Details)	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Heartland Bancorp, Inc. Capital Trust B
SUBORDINATED NOTES
Spread on interest rate basis	2.75%
Interest Rate	7.58%	6.83%
Heartland Bancorp, Inc. Capital Trust C
SUBORDINATED NOTES
Spread on interest rate basis	1.53%
Interest Rate	6.40%	6.30%
Heartland Bancorp, Inc. Capital Trust D
SUBORDINATED NOTES
Spread on interest rate basis	1.35%
Interest Rate	6.22%	6.12%
FFBI Capital Trust I
SUBORDINATED NOTES
Spread on interest rate basis	2.80%
Interest Rate	7.63%	6.88%
National Bancorp Statutory Trust I
SUBORDINATED NOTES
Spread on interest rate basis	2.90%
Interest Rate	7.77%	7.67%
Town And Country Statutory Trust II [Member]
SUBORDINATED NOTES
Spread on interest rate basis	2.79%
Interest Rate	7.70%
Town And Country Statutory Trust III [Member]
SUBORDINATED NOTES
Spread on interest rate basis	1.68%
Interest Rate	6.55%
WPI Statutory Trust I [Member]
SUBORDINATED NOTES
Spread on interest rate basis	1.45%
Interest Rate	6.32%

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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