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Note 11 - Subordinated Debentures (Details Textual) - Subordinated Debt [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 10, 2020
Jan. 11, 2018
Dec. 31, 2003
Mar. 31, 2023
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      
LIBOR - London Interbank Offered Rate [Member] | The Notes [Member]          
Debt Instrument, Basis Spread on Variable Rate   2.84%      
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       7.65%  
Center Bancorp Statutory Trust II [Member] | LIBOR - London Interbank Offered Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate     2.85%