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MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 727 $ 611      
Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 200 200      
Changes in other intangible assets          
Balance, beginning of period 14,718 15,596      
Additions 174 222      
Amortization (1,547) (471)      
Balance, end of period 13,345 15,347      
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period 15,820 17,696      
Fair market value, end of period 13,525 16,541      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value     $ 67,769 $ 67,595  
Accumulated Amortization     (54,424) (52,877)  
Other intangible assets 14,718 15,347 13,345 14,718 $ 15,347
Estimated Amortization Expense          
2020 (remainder)     4,400    
2019     4,764    
2020     3,856    
2021     325    
2022     0    
2023     0    
Thereafter     0    
Other intangible assets $ 14,718 $ 15,347 $ 13,345 $ 14,718 $ 15,347
Measurement Input, Discount Rate | Mortgage Servicing Rights          
Fair market value and key assumptions used in determining the fair market value          
Forecasted constant prepayment rate assumption (1)     0.095   0.095
Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights          
Fair market value and key assumptions used in determining the fair market value          
Forecasted constant prepayment rate assumption (1)     0.161   0.162