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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Mar. 31, 2024
USD ($)
period
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]          
Long term borrowings       $ 156,163,000 $ 156,102,000
Investment securities       1,285,781,000 1,279,548,000
Unamortized debt issuance costs       $ 384,000 445,000
Subordinated Debt          
Debt Instrument [Line Items]          
Number of periods interest can be deferred | period       20  
C P B Capital Trust I V          
Debt Instrument [Line Items]          
Common Securities Issued to Parent Value     $ 900,000    
Trust preferred securities issued value     $ 30,000,000    
C P B Capital Trust I V | Subordinated Debt          
Debt Instrument [Line Items]          
Long term borrowings       $ 30,900,000  
C P B Capital Trust V          
Debt Instrument [Line Items]          
Common Securities Issued to Parent Value   $ 600,000      
Trust preferred securities issued value   $ 20,000,000      
C P B Capital Trust V | Subordinated Debt          
Debt Instrument [Line Items]          
Long term borrowings       $ 20,600,000  
Maximum | Subordinated Debt          
Debt Instrument [Line Items]          
Redemption period       90 days  
Federal Home Loan Bank Borrowings          
Debt Instrument [Line Items]          
Line of Credit, maximum borrowing capacity       $ 1,930,000,000  
Unused borrowings available       1,800,000,000 1,810,000,000
FHLB advances and other short-term borrowings       0 0
Long term borrowings       50,000,000 50,000,000
Letters of Credit, outstanding       75,000,000 72,000,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Net loans and leases       $ 3,160,000,000 $ 3,160,000,000
Federal Home Loan Bank Borrowings | Minimum          
Debt Instrument [Line Items]          
Long term borrowings, interest rate       4.02% 4.02%
Federal Home Loan Bank Borrowings | Maximum          
Debt Instrument [Line Items]          
Long term borrowings, interest rate       4.62% 4.62%
Federal Reserve discount window line of credit          
Debt Instrument [Line Items]          
Unused borrowings available       $ 241,000,000 $ 285,800,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Net loans and leases       133,400,000 135,100,000
Investment securities       194,000,000 196,700,000
Pacific Coast Bankers' Bank ("PCBB")          
Debt Instrument [Line Items]          
Line of Credit, maximum borrowing capacity       50,000,000 50,000,000
Wells Fargo          
Debt Instrument [Line Items]          
Line of Credit, maximum borrowing capacity       $ 25,000,000 $ 25,000,000
Trust IV | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.45%    
Trust IV | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate       0.26% 0.26%
Trust V | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.87%      
Trust V | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate       0.26% 0.26%
Notes | Subordinated notes          
Debt Instrument [Line Items]          
Long term borrowings       $ 54,600,000  
Debt face amount $ 55,000,000        
Debt instrument, term 10 years        
Stated interest rate, first five years 4.75%     4.75% 4.75%
Unamortized debt issuance costs       $ 400,000  
Notes | Subordinated notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 4.56%     4.56% 4.56%