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INVESTMENT SECURITIES - Securities Pledged to Secure Borrowings and Public Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Washington, Oregon and California State to secure public deposits	$ 10,654	$ 212,806
Other securities pledged	1,440	2,011
Asset Pledged as Collateral without Right
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Total securities pledged as collateral	659,198	214,817
Asset Pledged as Collateral without Right | Deposits
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Federal Reserve Bank to secure borrowings	$ 647,104	$ 0

X

- Definition

Pledged Assets Not Separately Reported Securities Pledged For Federal Reserve Bank

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Pledged Assets Separately Reported Other Securities Pledged

+ References

No definition available.

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- Definition

[Line Items] for Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table]

+ References

No definition available.

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- Definition

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
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

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