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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%

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