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INVESTMENT SECURITIES - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
INVESTMENT SECURITIES
Fair value of debt securities reported less than their historical cost	$ 467,700,000		$ 472,000,000.0
Debt securities reported less than their historical cost percent of investment portfolio	94.80%		96.20%
Held-to-maturity securities	$ 200,427,000		$ 202,495,000
Total fair value of held-to-maturity	179,853,000		$ 177,765,000
Available for sale securities sold	0	$ 4,900,000
Available-for-sale securities, recognized gain		$ 7,000
Allowance for credit losses on securities	$ 0

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- Definition

Represents the Debt Securities Reported Less Than Their Historical Cost Percent of Investment Portfolio, as of the indicated date.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with interest rate reset through auction process, sold at par value.

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Amount 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).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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