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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
1 Months Ended 9 Months Ended
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Sep. 30, 2022
USD ($)
period
Dec. 31, 2021
USD ($)
Mar. 27, 2020
Debt Instrument [Line Items]          
Short-term borrowings     $ 115,000,000 $ 0  
Debt instrument, interest rate, stated percentage         1.00%
Long term borrowings     105,799,000 105,616,000  
Federal Home Loan Bank Borrowings          
Debt Instrument [Line Items]          
Line of Credit, maximum borrowing capacity     2,180,000,000 1,830,000,000  
Unused borrowings available     2,030,000,000.00 1,800,000,000  
Short-term borrowings     115,000,000    
Letters of Credit, outstanding     36,000,000 32,200,000  
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Commercial real estate and commercial loans pledged as collateral     3,200,000,000    
Federal Reserve discount window line of credit          
Debt Instrument [Line Items]          
Unused borrowings available     76,900,000 55,400,000  
Federal Reserve discount window line of credit | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Commercial real estate and commercial loans pledged as collateral     $ 127,400,000 $ 131,000,000  
C P B Capital Trust I V [Member]          
Debt Instrument [Line Items]          
Trust preferred securities issued value   $ 30,000,000      
Trust preferred securities, variable rate basis   three-month LIBOR      
Trust preferred securities, basis spread on variable rate   2.45%      
Common securities issued   $ 900,000      
C P B Capital Trust V [Member]          
Debt Instrument [Line Items]          
Trust preferred securities issued value $ 20,000,000        
Trust preferred securities, variable rate basis three-month LIBOR        
Trust preferred securities, basis spread on variable rate 1.87%        
Common securities issued $ 600,000        
Subordinated Debt [Member]          
Debt Instrument [Line Items]          
Number of periods interest can be deferred | period     20    
Subordinated Debt [Member] | C P B Capital Trust I V [Member]          
Debt Instrument [Line Items]          
Long term borrowings     $ 30,900,000    
Subordinated Debt [Member] | C P B Capital Trust V [Member]          
Debt Instrument [Line Items]          
Long term borrowings     $ 20,600,000    
Maximum | Federal Home Loan Bank Borrowings          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage     3.29%    
Maximum | Subordinated Debt [Member]          
Debt Instrument [Line Items]          
Redemption period     90 days    
Minimum | Federal Home Loan Bank Borrowings          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage     3.21%