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BASIS OF PRESENTATION, ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
Oct. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued interest receivable on held-to-maturity debt securities $ 9 $ 9      
Accrued interest receivable on available-for-sale debt securities 800 800      
Accrued interest receivable 11,200 10,800      
Net of tax effect 189,543 184,830   $ 180,522 $ 177,628
Reduction of allowance for credit losses 264 124   $ 170 $ 170
Additional allowance related [1] $ 19,873 $ 19,658      
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Adjustment to retained earnings     $ 4,000    
Net of tax effect     3,200    
Reduction of allowance for credit losses     100    
Additional allowance related     4,100    
Adjustment was recognized related to the securities portfolio     $ 0    
Number of loans experiencing financial difficulties and modifications | loan 0        
[1] Commencing on October 1, 2023 the allowance calculation is based on the current expected credit loss methodology. Prior to October 1, 2023 the calculation was based on the the incurred loss methodology. Refer to Note 1 for further discussion.