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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Mortgage and commercial loans servicing narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Valuation servicing rights in tranches [Line Items]      
Mortgage loans serviced for others $ 728,900,000   $ 723,300,000
Custodial escrow balances maintained 8,200,000   4,500,000
Valuation allowance 0    
Valuation adjustment on servicing rights 1,658,000 $ 917,000  
Mortgage servicing rights      
Valuation servicing rights in tranches [Line Items]      
Fees collected for servicing of mortgage loans $ 454,000 $ 464,000  
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum      
Valuation servicing rights in tranches [Line Items]      
Average capitalization rate (percent) 0.0083 0.0076  
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum      
Valuation servicing rights in tranches [Line Items]      
Average capitalization rate (percent) 0.0111 0.0112  
Mortgage Servicing Rights 15-year Tranche      
Valuation servicing rights in tranches [Line Items]      
Amortization period (in years) 15 years    
Valuation allowance $ 0   327,000
Mortgage Servicing Rights 30-year Tranche      
Valuation servicing rights in tranches [Line Items]      
Amortization period (in years) 30 years    
Valuation allowance     $ 1,300,000