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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details) |  | 1 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 20, 2020 USD ($) | Dec. 31, 2004 USD ($) | Sep. 30, 2004 USD ($) | Jun. 30, 2025 | Sep. 30, 2025 USD ($) period | Dec. 31, 2024 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  |  | $ 131,527,000 | $ 156,345,000
Investment securities |  |  |  |  | 1,329,569,000 | 1,334,588,000
Junior subordinated debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  |  | $ 51,547,000 | 51,547,000
Number of periods interest can be deferred | period |  |  |  |  | 20 |
Subordinated notes, net of unamortized debt issuance costs |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  |  | $ 54,980,000 | 54,798,000
C P B Capital Trust I V |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Trust preferred securities issued value |  |  | $ 30,000,000 |  |  |
Common securities issued to company |  |  | $ 900,000 |  |  |
C P B Capital Trust I V | Junior subordinated debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  |  | 30,900,000 |
C P B Capital Trust V |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Trust preferred securities issued value |  | $ 20,000,000 |  |  |  |
Common securities issued to company |  | $ 600,000 |  |  |  |
C P B Capital Trust V | Junior subordinated debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  |  | $ 20,600,000 |
Maximum | Junior subordinated debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption period |  |  |  |  | 90 days |
Federal Home Loan Bank Borrowings |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit, maximum borrowing capacity |  |  |  |  | $ 1,590,000,000 | 1,760,000,000
Unused borrowings available |  |  |  |  | 1,470,000,000 | 1,630,000,000
FHLB advances and other short-term borrowings |  |  |  |  | 0 | 0
Long term borrowings |  |  |  |  | 25,000,000 | 25,000,000
Letters of Credit, outstanding |  |  |  |  | 95,600,000 | 83,600,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net loans and leases |  |  |  |  | $ 2,790,000,000 | $ 3,140,000,000
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 |  |  |  |  | $ 209,200,000 | $ 232,100,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net loans and leases |  |  |  |  | 100,100,000 | 128,300,000
Investment securities |  |  |  |  | 174,800,000 | 184,300,000
Pacific Coast Bankers' Bank ("PCBB") |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unused borrowings available |  |  |  |  | 75,000,000 | 75,000,000
CPB Capital Trust IV | Junior Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.45% |  |  |
CPB Statutory Trust V | Junior Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.87% |  |  |  |
Notes | Subordinated notes, net of unamortized debt issuance costs |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  |  | $ 55,000,000.0 | $ 54,800,000
Basis spread on variable rate | 4.56% |  |  | 4.56% | 4.56% |
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 |  |  |  |  | $ 20,000 | $ 200,000

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