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JUNIOR SUBORDINATED DEBENTURES ISSUED TO CAPITAL TRUSTS - Carrying Values (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) subsidiary	Dec. 31, 2020 USD ($)
SUBORDINATED NOTES
Number of subsidiary business trusts | subsidiary	5
Total junior subordinated debentures, at carrying value	$ 39,316	$ 39,238
Junior Subordinated Debentures Issued
SUBORDINATED NOTES
Face amount	38,765	38,765
Total junior subordinated debentures, at carrying value	37,714	37,648
Junior Subordinated Debentures Issued | Heartland Bancorp, Inc. Capital Trust B
SUBORDINATED NOTES
Face amount	10,310	10,310
Junior Subordinated Debentures Issued | Heartland Bancorp, Inc. Capital Trust C
SUBORDINATED NOTES
Face amount	10,310	10,310
Junior Subordinated Debentures Issued | Heartland Bancorp, Inc. Capital Trust D
SUBORDINATED NOTES
Face amount	5,155	5,155
Junior Subordinated Debentures Issued | FFBI Capital Trust I
SUBORDINATED NOTES
Face amount	7,217	7,217
Junior Subordinated Debentures Issued | National Bancorp Statutory Trust I
SUBORDINATED NOTES
Face amount	5,773	5,773
Unamortized discount	$ (1,051)	$ (1,117)

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