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SUBORDINATED DEBENTURES - Interest rate and maturities (Details)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Heartland Bancorp, Inc. Capital Trust B
SUBORDINATED DEBENTURES
Interest Rate	4.58%	4.74%
Heartland Bancorp, Inc. Capital Trust B | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	2.75%
Heartland Bancorp, Inc. Capital Trust C
SUBORDINATED DEBENTURES
Interest Rate	2.27%	3.42%
Heartland Bancorp, Inc. Capital Trust C | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	1.53%
Heartland Bancorp, Inc. Capital Trust D
SUBORDINATED DEBENTURES
Interest Rate	2.09%	3.24%
Heartland Bancorp, Inc. Capital Trust D | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	1.35%
FFBI Capital Trust I
SUBORDINATED DEBENTURES
Interest Rate	4.63%	4.79%
FFBI Capital Trust I | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	2.80%
National Bancorp Statutory Trust I
SUBORDINATED DEBENTURES
Interest Rate	3.64%	4.79%
National Bancorp Statutory Trust I | LIBOR
SUBORDINATED DEBENTURES
Spread on interest rate basis	2.90%

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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)
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-Section S99
-Paragraph 1
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