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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Mortgage and commercial loans servicing narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Valuation servicing rights in tranches [Line Items]          
Mortgage loans serviced for others $ 734,900,000   $ 734,900,000   $ 723,300,000
Custodial escrow balances maintained 17,000,000   17,000,000   $ 4,500,000
Valuation allowance     0    
Valuation adjustment on servicing rights 0 $ 195,000 1,658,000 $ 586,000  
Mortgage servicing rights          
Valuation servicing rights in tranches [Line Items]          
Fees collected for servicing of mortgage loans $ 472,000 $ 446,000 $ 1,400,000 $ 1,400,000  
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum          
Valuation servicing rights in tranches [Line Items]          
Average capitalization rate (percent) 0.0083 0.0076 0.0083 0.0076  
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum          
Valuation servicing rights in tranches [Line Items]          
Average capitalization rate (percent) 0.0133 0.0120 0.0133 0.0120  
Mortgage Servicing Rights 15-year Tranche          
Valuation servicing rights in tranches [Line Items]          
Amortization period (in years)     15 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   30 years
Valuation allowance         $ 1,300,000