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INVESTMENT SECURITIES - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
INVESTMENT SECURITIES
Fair value of debt securities reported less than their historical cost	$ 446,700,000		$ 446,700,000		$ 472,000,000.0
Debt securities reported less than their historical cost percent of investment portfolio	99.70%		99.70%		96.20%
Amortized Carrying Value	$ 196,716,000		$ 196,716,000		$ 202,495,000
Total fair value of held-to-maturity	166,090,000		166,090,000		$ 177,765,000
Available for sale securities sold	0	$ 5,100,000	0	$ 10,200,000
Available-for-sale securities, recognized gain		$ 31,000		$ 38,000
Allowance for credit losses on securities	$ 0		$ 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).

+ References

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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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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