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INVESTMENT SECURITIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) security | Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) security | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Gross unrealized loss | $ 78,002 |  |  | $ 78,002 |  | $ 66,181
Accrued interest receivable on loans receivable | $ 11,800 |  |  | $ 11,800 |  | $ 9,200
Securities available for sale portfolio | security | 86 |  |  | 86 |  | 77
Available for sale securities in unrealized loss position | security | 84 |  |  | 84 |  | 76
Credit losses on available for sale securities |  | $ 0 |  |  | $ 0 |
Credit losses on held to maturity securities |  | $ 0 |  |  | $ 0 |
Investment Grade |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available for sale securities in unrealized loss position | security | 81 |  |  | 81 |  |
Collateral Pledged | FRB Discount Window |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Securities pledged | $ 525,700 |  |  | $ 525,700 |  | $ 356,500
Certain Longer Duration Fixed-Rate Mortgage Backed Securities and Municipal Securities |  |  |  |  |  |
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 |  |  |
Available-for-sale securities, accumulated gross unrealized loss, before tax |  |  | $ 16,600 |  |  |
Gross unrealized loss | 15,000 |  |  | 15,000 |  |
Corporate debt securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Credit losses on available for sale securities | $ 0 |  |  | $ 1,000 |  |
Number of corporate debt securities | security | 3 |  |  | 3 |  |

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