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PREMISES AND EQUIPMENT - Narrative (Details) $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($) bankBranch	Dec. 06, 2024 bankBranch
Business Acquisition [Line Items]
Reductions to premises and equipment | $	$ 3.2
Sale | Old Second National Bank Branch
Business Acquisition [Line Items]
Number of branches sold | bankBranch	5	5

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Disposal Group, Not Discontinued Operations, Branches Sold

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

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Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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