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Note 10 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) - Center Bancorp Statutory Trust II [Member] - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 03, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 19, 2003
Securities issued |  | $ 5,000,000 |  |
Subordinated Debt [Member] |  |  |  |
Securities issued |  | $ 5,000,000 | $ 5,000,000,000 | $ 5,000,000
Liquidation value (in dollars per share) |  | $ 1,000 | $ 1,000 |
Maturity |  | Jan. 23, 2034 | Jan. 23, 2034 |
Redeemable by issuer beginning |  | Jan. 23, 2009 | Jan. 23, 2009 |
Subordinated Debt [Member] | Tenor Spread Adjustment [Member] |  |  |  |
Coupon rate | 0.26161% | 0.26161% |  |
Subordinated Debt [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |
Coupon rate | 2.85% | 2.85% | 2.85% |

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