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