Annual report pursuant to Section 13 and 15(d)

INVESTMENT SECURITIES (Narrative) (Details)

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INVESTMENT SECURITIES (Narrative) (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Securities
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
Securities
Item
Dec. 31, 2022
USD ($)
Securities
Item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Investment Securities [Abstract]                      
Securities pledged to secure public deposits               $ 578,500,000 $ 656,100,000    
Schedule of Available-for-sale Securities [Line Items]                      
Number of holdings securities in an amount greater than 10% of shareowner's equity | Securities               0 0    
Amortized Cost               $ 367,747,000 $ 455,232,000    
Fair Value               337,902,000 413,294,000    
Unrealized Losses               29,928,000 41,946,000    
Allowance for Credit Losses               29,941,000 25,068,000 $ 21,606,000 $ 23,816,000
Equity Securities               3,450,000 10,000    
Securities held nonaccrual status               0      
Proceeds from the Sale of Securities $ 0   $ 3,365,000 $ 0 $ 3,365,000 $ 30,420,000 $ 3,365,000 30,420,000 3,365,000 $ 495,000  
Municipal Securities [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Allowance for Credit Losses               $ 8,000      
Number of positions in AFS and HTM investments with unrealized losses | Item               101      
U.S. Government and Municipal Bonds [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Number of positions in AFS and HTM investments with unrealized losses | Item               691      
Debt Securities [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Available-for-sale Securities and Held-To-Maturity, Continuous Unrealized Loss Position, Accumulated Loss               $ 63,200,000 $ 90,000,000.0    
Number of positions in AFS and HTM investments with unrealized losses | Item               878 928    
U.S. Treasury Securities [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Amortized Cost               $ 25,947,000 $ 23,977,000    
Fair Value               24,679,000 22,050,000    
Unrealized Losses               $ 1,269,000 1,928,000    
Number of positions in AFS and HTM investments with unrealized losses | Item               86      
U.S. Government Agency [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Amortized Cost               $ 152,983,000 198,888,000    
Fair Value               145,034,000 186,052,000    
Unrealized Losses               8,053,000 12,863,000    
Allowance for Credit Losses               0      
Estimated write off of loans and leases receivable               0      
Available-for-sale Securities [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Number of available for sale securities transferred | Securities   33                  
Amortized Cost   $ 168,400,000         168,400,000        
Fair Value   $ 159,000,000.0         $ 159,000,000.0        
Unrealized Losses               4,500,000 7,900,000    
Corporate Debt Securities [Member]                      
Schedule of Available-for-sale Securities [Line Items]                      
Amortized Cost               63,600,000 97,119,000    
Fair Value               57,552,000 88,236,000    
Unrealized Losses               6,031,000 $ 8,874,000    
Allowance for Credit Losses               $ 17,000