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INVESTMENT SECURITIES - Pledged to Secure Borrowings and Public Deposits (Details) - Asset Pledged as Collateral without Right - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total securities pledged as collateral | $ 452,653 | $ 659,198
Deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Federal Reserve Bank to secure borrowings | 283,038 | 647,104
Washington, Oregon and California to secure public deposits | 168,259 | 10,654
Notes Payable, Other Payables |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities pledged | $ 1,356 | $ 1,440

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