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SUBORDINATED DEBENTURES - Interest rate and maturities (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Heartland Bancorp, Inc. Capital Trust B
SUBORDINATED DEBENTURES
Variable Interest Rate Basis	LIBOR	LIBOR
Interest Rate	4.74%	5.19%
Heartland Bancorp, Inc. Capital Trust B | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	2.75%
Heartland Bancorp, Inc. Capital Trust C
SUBORDINATED DEBENTURES
Variable Interest Rate Basis	LIBOR	LIBOR
Interest Rate	3.42%	4.32%
Heartland Bancorp, Inc. Capital Trust C | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	1.53%
Heartland Bancorp, Inc. Capital Trust D
SUBORDINATED DEBENTURES
Variable Interest Rate Basis	LIBOR	LIBOR
Interest Rate	3.24%	4.14%
Heartland Bancorp, Inc. Capital Trust D | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	1.35%
FFBI Capital Trust I
SUBORDINATED DEBENTURES
Variable Interest Rate Basis	LIBOR	LIBOR
Interest Rate	4.79%	5.24%
FFBI Capital Trust I | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	2.80%
National Bancorp Statutory Trust I
SUBORDINATED DEBENTURES
Variable Interest Rate Basis	LIBOR	LIBOR
Interest Rate	4.79%	5.69%
National Bancorp Statutory Trust I | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	2.90%

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- Definition

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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=109500613&loc=SL6036836-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&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=6877327&loc=d3e13212-122682

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