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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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Pledged Assets Not Separately Reported Securities Pledged For Federal Reserve Bank

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Amount, after 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), 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 net income (trading).

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