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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, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Total securities pledged as collateral	$ 660,054	$ 214,817
Deposits
Debt Securities, Available-for-sale [Line Items]
Federal Reserve Bank to secure borrowings	647,933	0
Washington, Oregon and California to secure public deposits	10,655	212,806
Notes Payable, Other Payables
Debt Securities, Available-for-sale [Line Items]
Other securities pledged	$ 1,466	$ 2,011

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Pledged Assets Not Separately Reported Securities Pledged For Federal Reserve Bank

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Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments.

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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