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SUBORDINATED DEBENTURES - Interest rate and maturities (Details) | 12 Months Ended
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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 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 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=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 + Details
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