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MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans     $ 9,971 $ 2,836      
Mortgage Servicing Rights              
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 1,000 $ 400 2,300 1,200      
Changes in other intangible assets              
Balance, beginning of period     14,718 15,596      
Additions     2,269 1,189      
Amortization (1,300) (700) (4,558) (1,727)      
Balance, end of period 12,429 15,058 12,429 15,058      
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 12,694 15,965 12,694 15,965      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value         $ 69,864 $ 67,595  
Accumulated Amortization         (57,435) (52,877)  
Other intangible assets 12,429 15,058 12,429 15,058 12,429 14,718 $ 15,058
Estimated Amortization Expense              
2020 (remainder)         957    
2021         3,375    
2022         2,682    
2023         2,181    
2024         1,801    
2025         1,433    
Thereafter         0    
Other intangible assets $ 12,429 $ 15,058 $ 12,429 $ 15,058 $ 12,429 $ 14,718 $ 15,058
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)         0.096   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)         0.243   0.119