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Note 13 - Subordinated Debentures (Details Textual) - Subordinated Debt [Member] - USD ($) |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 15, 2025 | Jul. 03, 2023 | Jun. 10, 2020 | Dec. 31, 2003 | Jun. 30, 2025 | Dec. 31, 2024 | Dec. 19, 2003
The 2020 Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 75,000,000 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 9.92% |  |
The 2025 Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 200,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.125% |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | The 2020 Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 5.605% |  |  |  |
Secured Overnight Financing Rate (SOFR) [Member] | The 2025 Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 4.415% |  |  |  |  |  |
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, Interest Rate, Effective Percentage |  |  |  |  | 7.39% |  |
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] | Tenor Spread Adjustment [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.26161% |  |  | 0.26161% | 0.26161% |
Center Bancorp Statutory Trust II [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.85% | 2.85% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 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://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 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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