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DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Components of Interest Rate Swaps (Details) - Derivatives	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Interest rate swaps - FHLB advances
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Pay Rate	3.49%	3.49%
Weighted Average Receive Rate	5.32%	5.34%
Weighted Average Maturity in Years	4 years	4 years 3 months 18 days
Interest rate swaps - AFS securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Pay Rate	5.32%	5.34%
Weighted Average Receive Rate	3.73%	3.73%
Weighted Average Maturity in Years	6 months	8 months 12 days
Interest rate swaps - commercial loans
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted Average Pay Rate	4.12%	4.12%
Weighted Average Receive Rate	5.32%	5.34%
Weighted Average Maturity in Years	3 years 4 months 24 days	3 years 8 months 12 days

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- Definition

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- Definition

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- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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