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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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- Definition 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). + References No definition available. + Details
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