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JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS - Interest rate and maturities (Details) - Junior Subordinated Debentures Issued	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Heartland Bancorp, Inc. Capital Trust B
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Interest Rate	2.99%	2.99%
Heartland Bancorp, Inc. Capital Trust B | LIBOR
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Spread on interest rate basis	2.75%
Heartland Bancorp, Inc. Capital Trust C
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Interest Rate	1.71%	1.75%
Heartland Bancorp, Inc. Capital Trust C | LIBOR
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Spread on interest rate basis	1.53%
Heartland Bancorp, Inc. Capital Trust D
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Interest Rate	1.53%	1.57%
Heartland Bancorp, Inc. Capital Trust D | LIBOR
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Spread on interest rate basis	1.35%
FFBI Capital Trust I
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Interest Rate	3.04%	3.04%
FFBI Capital Trust I | LIBOR
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Spread on interest rate basis	2.80%
National Bancorp Statutory Trust I
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Interest Rate	3.08%	3.12%
National Bancorp Statutory Trust I | LIBOR
JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS
Spread on interest rate basis	2.90%

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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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 http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

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