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INVESTMENT SECURITIES - Securities Pledged to Secure Borrowings and Public Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Washington, Oregon and California State to secure public deposits	$ 195,212	$ 10,654
Other securities pledged	1,334	1,440
Asset Pledged as Collateral without Right
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Total securities pledged as collateral	1,103,021	659,198
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 existing or potential borrowings	$ 906,475	$ 647,104

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- Definition

Pledged Assets Not Separately Reported Securities Pledged For Federal Reserve Bank

+ References

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- Definition

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

+ References

No definition available.

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- Definition

Pledged Assets Separately Reported Other Securities Pledged

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No definition available.

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- Definition

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

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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/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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