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SECURITIES AVAILABLE FOR SALE - Basis for Impairment Conclusion (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Allowance on AFS debt securities | $	$ 0.0	$ 0.0
Obligations of US Government-sponsored enterprises
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	8
Available for sale securities portfolio, number of securities (security)	8
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	1.44%
US Government-sponsored enterprises
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	448
Available for sale securities portfolio, number of securities (security)	493
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	13.64%
US Government agency
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	130
Available for sale securities portfolio, number of securities (security)	151
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	13.68%
Private label
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	26
Available for sale securities portfolio, number of securities (security)	28
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	3.05%
Obligations of states and political subdivisions thereof
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	52
Available for sale securities portfolio, number of securities (security)	69
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	12.48%
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale, securities in unrealized loss positions (security)	30
Available for sale securities portfolio, number of securities (security)	35
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage)	9.75%

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- Definition

Represents the aggregate unrealized losses, expressed as a percentage of the amortized cost of the securities in a continuous unrealized loss position categorized as held-to-maturity and available-for-sales securities.

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
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-Section 45
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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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