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Note 11 - Subordinated Debentures (Details Textual) - USD ($) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2020 | Jan. 11, 2018 | Dec. 31, 2003 | Sep. 30, 2023 | Dec. 31, 2022 | May 01, 2023 | Dec. 19, 2003
Subordinated Debt [Member] | The 2020 Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 75,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |  |  |  |
Subordinated Debt [Member] | The Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 75,000,000 |  |  |  |  |
Subordinated Debt [Member] | LIBOR - London Interbank Offered Rate [Member] | The Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.84% |  |  |  |  |
Subordinated Debt [Member] | 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 |  |  |
Center Bancorp Statutory Trust II [Member] | Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 5,000,000,000 | $ 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 |  |  |  | 8.48% |  |  |
Center Bancorp Statutory Trust II [Member] | Subordinated Debt [Member] | LIBOR - London Interbank Offered Rate [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.85% |  |  |  |
Center Bancorp Statutory Trust II [Member] | Subordinated Debt [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.85% |  | 0.26161% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482949/835-30-55-8 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-6 + Details
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