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LOANS AND ALLOWANCE (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
Accounts Notes And Loans Receivable [Line Items]    
Total loans $ 2,393,669,000 $ 2,339,986,000
Total loans, net $ 2,393,669,000 2,339,986,000 [1]
TDRs during period | loan 10  
TDR, subsequent default, number of contracts 0  
TDR amount $ 3,100,000  
Loans Receivable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Accrued interest receivable 10,000,000.0 10,800,000
Doubtful [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Total loans, net 0 0
Residential Portfolio Segment [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Mortgage loans on real estate, foreclosures 800,000 900,000
Paycheck Protection Program Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Financing receivable, allowance for credit loss 0  
Financing Receivable, 90 Days or More Past Due, Still Accruing $ 1,800,000 $ 300,000
[1] Derived from audited consolidated financial statements