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LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR, Recorded Investment and Number of Modifications (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
item
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Modifications | item   0  
Total residential real estate | Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Residential mortgage loans collateralized by real estate property in the process of foreclosure | $ $ 0   $ 430