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INVESTMENT SECURITIES - Additional Information (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2022 USD ($) security	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) security	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Amortized cost basis, transferred from the available-for-sale portfolio to the held-to-maturity portfolio		$ 346,000,000
Available-for-sale securities, accumulated gross unrealized loss, before tax		$ 16,600,000
Net unrealized loss on securities transferred from available-for-sale to held-to-maturity	$ 0			$ 0		$ 0
Securities available for sale portfolio | security	79			79		119
Available for sale securities in unrealized loss position | security	63			63		46
Credit losses on held to maturity securities	$ 0		$ 0	$ 0	$ 0
Credit losses on available for sale securities	0		$ 0	0	$ 0
Collateral Pledged | FRB Discount Window
Debt Securities, Available-for-sale [Line Items]
Securities pledged	123,200,000			123,200,000		$ 8,900,000
Collateral Pledged | FHLB Advances
Debt Securities, Available-for-sale [Line Items]
Securities pledged	205,500,000			205,500,000		0
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale and held to maturity, accrued interest, after allowance for credit loss	$ 5,500,000			$ 5,500,000		$ 4,700,000

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Amortized Cost Basis, Transferred From the Available-for-sale Portfolio to the Held-to-maturity Portfolio

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Debt Securities, Available-For-Sale And Held To Maturity, Accrued Interest, After Allowance For Credit Loss

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Amount of increase (decrease) in allowance for credit loss of 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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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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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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