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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%