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MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 2,439 $ 727      
Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 500 200      
Changes in other intangible assets          
Balance, beginning of period 11,865 14,718      
Additions 461 174      
Amortization (1,232) (1,547)      
Balance, end of period 11,094 13,345      
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 11,673 13,525      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value     $ 71,370 $ 70,909  
Accumulated Amortization     (60,276) (59,044)  
Other intangible assets 11,094 13,345 11,094 11,865 $ 13,345
Estimated Amortization Expense          
2021 (remainder)     3,642    
2021     3,584    
2022     2,918    
2023     950    
2024     0    
2025     0    
Thereafter     0    
Other intangible assets $ 11,094 $ 13,345 $ 11,094 $ 11,865 $ 13,345
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   0.095
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     0.175   0.161