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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%