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MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans     $ 3,654 $ 5,273  
Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 300 $ 1,100 700 1,300  
Changes in other intangible assets          
Balance, beginning of period     11,865 14,718  
Additions     717 1,270  
Amortization (900) (1,700) (2,082) (3,217)  
Balance, end of period 10,500 12,771 10,500 12,771  
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period     12,003 15,820  
Fair market value, end of period 10,755 13,060 10,755 13,060  
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value 71,626   71,626   $ 70,909
Accumulated Amortization (61,126)   (61,126)   (59,044)
Other intangible assets 10,500 12,771 10,500 12,771 11,865
Estimated Amortization Expense          
2021 (remainder) 1,432   1,432    
2021 2,446   2,446    
2022 1,974   1,974    
2023 1,596   1,596    
2024 1,316   1,316    
2025 1,092   1,092    
Thereafter 644   644    
Other intangible assets $ 10,500 $ 12,771 $ 10,500 $ 12,771 $ 11,865
Measurement Input, Discount Rate | Mortgage Servicing Rights          
Fair market value and key assumptions used in determining the fair market value          
Weighted average prepayment speed assumption 0.096 0.096 0.096 0.096  
Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights          
Fair market value and key assumptions used in determining the fair market value          
Weighted average prepayment speed assumption 0.180 0.217 0.180 0.217