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Note 12 - Subordinated Debentures (Details Textual) - Subordinated Debt [Member] - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 10, 2020
Dec. 31, 2003
Jun. 30, 2024
Dec. 31, 2023
May 01, 2023
Dec. 19, 2003
The 2020 Notes [Member]            
Debt Instrument, Face Amount $ 75,000,000          
Debt Instrument, Interest Rate, Stated Percentage 5.75%          
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 $ 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     8.44%      
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] | Secured Overnight Financing Rate (SOFR) [Member]            
Debt Instrument, Interest Rate, Effective Percentage         0.26161%