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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
1 Months Ended 3 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Mar. 31, 2023
USD ($)
period
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]          
Short-term borrowings       $ 25,000,000 $ 5,000,000
Long term borrowings       155,920,000 105,859,000
Unamortized debt issuance costs       $ (627,000) (688,000)
Subordinated Debt          
Debt Instrument [Line Items]          
Number of periods interest can be deferred | period       20  
C P B Capital Trust I V          
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 I V | Subordinated Debt          
Debt Instrument [Line Items]          
Long term borrowings       $ 30,900,000  
C P B Capital Trust V          
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      
C P B Capital Trust V | Subordinated Debt          
Debt Instrument [Line Items]          
Long term borrowings       $ 20,600,000  
Maximum | Subordinated Debt          
Debt Instrument [Line Items]          
Redemption period       90 days  
Federal Home Loan Bank Borrowings          
Debt Instrument [Line Items]          
Line of Credit, maximum borrowing capacity       $ 2,050,000,000.00 2,230,000,000
Unused borrowings available       1,940,000,000 2,190,000,000
Short-term borrowings       $ 25,000,000 5,000,000
Short-term borrowings, interest rate       5.07%  
Letters of Credit, outstanding       $ 36,000,000 36,000,000
Long term borrowings       50,000,000  
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Net loans and leases       $ 3,190,000,000  
Federal Home Loan Bank Borrowings | Minimum          
Debt Instrument [Line Items]          
Long term borrowings, interest rate       4.02%  
Federal Home Loan Bank Borrowings | Maximum          
Debt Instrument [Line Items]          
Long term borrowings, interest rate       4.62%  
Federal Reserve discount window line of credit          
Debt Instrument [Line Items]          
Unused borrowings available       $ 76,600,000 75,900,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Net loans and leases       123,200,000 $ 125,000,000
Notes | Subordinated notes          
Debt Instrument [Line Items]          
Long term borrowings       $ 54,400,000  
Debt face amount $ 55,000,000        
Debt instrument, term 10 years        
Stated interest rate, first five years 4.75%     0.0475%  
Unamortized debt issuance costs       $ (600,000)  
Notes | Subordinated notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 4.56%