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FAIR VALUE (Narrative) (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Feb. 28, 2024
bank
Dec. 31, 2023
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Premises, furniture and equipment held for sale $ 16,064   $ 4,069
Loans held for sale 352,744   $ 5,071
Rocky Mountain Bank      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Premises, furniture and equipment held for sale 13,200    
Loans held for sale $ 352,700    
Disposal group, number of bank branches | bank   9