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INVESTMENT SECURITIES - Pledged to Secure Borrowings and Public Deposits (Details) - Asset Pledged as Collateral without Right - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Total securities pledged as collateral $ 200,284 $ 211,411
Deposits    
Debt Securities, Available-for-sale [Line Items]    
Washington, Oregon and California to secure public deposits 195,497 206,153
Notes Payable, Other Payables    
Debt Securities, Available-for-sale [Line Items]    
Other securities pledged $ 4,787 $ 5,258