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INVESTMENT SECURITIES - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2022 USD ($) security	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) security	Sep. 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
Credit losses on held to maturity securities	0		$ 0	0	$ 0
Credit losses on available for sale securities	0		$ 0	0	$ 0
Accrued interest receivable on loans receivable	$ 8,200,000			$ 8,200,000		$ 4,700,000
Securities available for sale portfolio | security	82			82		119
Available for sale securities in unrealized loss position | security	80			80		46
Collateral Pledged | FRB Discount Window
Debt Securities, Available-for-sale [Line Items]
Securities pledged	$ 123,100,000			$ 123,100,000		$ 8,900,000
Collateral Pledged | FHLB Advances
Debt Securities, Available-for-sale [Line Items]
Securities pledged						$ 0

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

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Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) 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 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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Amount of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity) and 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 restricted 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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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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