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Note 9 - Subordinated Debentures (Details Textual) - Subordinated Debt [Member] - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 10, 2020 | Jan. 11, 2018 | Dec. 31, 2003 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2015 | Dec. 19, 2003
The 2020 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 75.0 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |  |  |  |  |
The Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 75.0 |  |  |  |  |  |
The 2015 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 50.0 |
Debt Instrument, Interest Rate During Period |  |  |  |  |  | 4.16% |  |
London Interbank Offered Rate (LIBOR) [Member] | The Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.84% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | The 2015 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 3.93% |  |  |
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 |  |  |  | $ 5,000.0 |  |  |  | $ 5.0
Proceeds from Issuance of Debt |  |  | $ 5.2 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.85% |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 7.26% |  |  |  |
Center Bancorp Statutory Trust II [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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