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Note 12 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 19, 2003
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Subordinated Debt [Member] | Center Bancorp Statutory Trust II [Member] |  |  |
Securities issued | $ 5,000,000 | $ 5,000,000 | $ 5,000,000
Liquidation value (in dollars per share) | $ 1,000 | $ 1,000 |
Coupon rate | 2.85% | 2.85% |
Maturity | Jan. 23, 2034 | Jan. 23, 2034 |
Redeemable by issuer beginning | Jan. 23, 2009 | Jan. 23, 2009 |

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