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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, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Valuation servicing rights in tranches [Line Items]          
Mortgage loans serviced for others $ 711,600,000   $ 711,600,000   $ 743,300,000
Custodial escrow balances maintained 16,200,000   16,200,000   5,700,000
Loans guaranteed and sold with servicing retained 6,351,000   6,351,000   6,052,000
Valuation allowance     1,700,000    
Mortgage servicing rights          
Valuation servicing rights in tranches [Line Items]          
Fair value of mortgage servicing rights 5,800,000   $ 5,800,000   $ 5,200,000
Average constant prepayment rate (as a percent)     14.80%   16.20%
Servicing assets, discount rate (as a percent)     9.02%   9.02%
Fees collected for servicing of mortgage loans $ 446,000 $ 443,000 $ 1,400,000 $ 1,300,000  
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum          
Valuation servicing rights in tranches [Line Items]          
Average capitalization rate (percent) 0.0076 0.0076 0.0076 0.0076  
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum          
Valuation servicing rights in tranches [Line Items]          
Average capitalization rate (percent) 0.0120 0.0116 0.0120 0.0116  
Commercial servicing rights          
Valuation servicing rights in tranches [Line Items]          
Fair value of mortgage servicing rights $ 958,000 $ 1,497,000 $ 958,000 $ 1,497,000 $ 1,300,000
Fees collected for servicing of mortgage loans 102,000 $ 70,000 396,000 $ 242,000  
Loans guaranteed and sold with servicing retained 52,800,000   $ 52,800,000   $ 66,200,000
Commercial servicing rights | Minimum          
Valuation servicing rights in tranches [Line Items]          
Average constant prepayment rate (as a percent)     13.45%   14.95%
Servicing assets, discount rate (as a percent)     8.02%   7.70%
Commercial servicing rights | Maximum          
Valuation servicing rights in tranches [Line Items]          
Average constant prepayment rate (as a percent)     16.85%   19.25%
Servicing assets, discount rate (as a percent)     9.42%   12.88%
Commercial servicing rights | Measurement Input, Cap Rate | Minimum          
Valuation servicing rights in tranches [Line Items]          
Average capitalization rate (percent)         0.0310
Commercial servicing rights | Measurement Input, Cap Rate | Maximum          
Valuation servicing rights in tranches [Line Items]          
Average capitalization rate (percent)         0.0445
Mortgage Servicing Rights 15-year Tranche          
Valuation servicing rights in tranches [Line Items]          
Valuation allowance     $ 435,000   $ 422,000
Amortization period (in years)     15 years    
Mortgage Servicing Rights 30-year Tranche          
Valuation servicing rights in tranches [Line Items]          
Valuation allowance         1,400,000
Amortization period (in years)     30 years    
Less Than 20 Years          
Valuation servicing rights in tranches [Line Items]          
Fair value of mortgage servicing rights 211,000   $ 211,000   203,000
Period of tranche (in years)     20 years    
Valuation allowance     $ 0   $ 0
Amortization period (in years)     20 years   20 years
More Than 20 Years          
Valuation servicing rights in tranches [Line Items]          
Fair value of mortgage servicing rights $ 747,000   $ 747,000   $ 1,085,000
Period of tranche (in years)     20 years    
Valuation allowance     $ 0   $ 0
Amortization period (in years)     20 years   20 years