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Note 12 - Subordinated Debentures (Details Textual) - Subordinated Debt [Member] - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 10, 2020 | Dec. 31, 2003 | Mar. 31, 2024 | Dec. 31, 2023 | May 01, 2023 | Dec. 19, 2003
The 2020 Notes [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 75,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | The 2020 Notes [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.605% |  |  |  |  |
Center Bancorp Statutory Trust II [Member] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 5,000,000 | $ 5,000,000 |  | $ 5,000,000
Proceeds from Issuance of Debt |  | $ 5,200,000 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.85% | 2.85% |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 8.43% |  |  |
Center Bancorp Statutory Trust II [Member] | LIBOR - London Interbank Offered Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.85% |  |  |  |
Center Bancorp Statutory Trust II [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 0.26161% |

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