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JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS - Interest rate and maturities (Details) - Junior Subordinated Debentures Issued | 3 Months Ended |
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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 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 + Details
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