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INVESTMENT SECURITIES - Securities Pledged to Secure Borrowings and Public Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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

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- Definition Pledged Assets Not Separately Reported Securities Pledged For Federal Reserve Bank + References No definition available. + Details
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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. + Details
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- Definition [Line Items] for Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] + References No definition available. + Details
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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 + Details
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