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INVESTMENT SECURITIES - Pledged to Secure Borrowings and Public Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Washington, Oregon and California to secure public deposits	$ 195,385	$ 195,212
Other securities pledged	1,278	1,334
Asset Pledged as Collateral without Right
Debt Securities, Available-for-sale [Line Items]
Total securities pledged as collateral	1,060,970	1,103,021
Asset Pledged as Collateral without Right | Deposits
Debt Securities, Available-for-sale [Line Items]
Federal Reserve Bank to secure borrowings	$ 864,307	$ 906,475

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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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