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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
OTHER INTANGIBLE ASSETS      
Loans Serviced For Others $ 1,400,000 $ 1,730,000  
Mortgage banking income 7,732 13,682 $ 6,685
Mortgage Servicing Rights      
OTHER INTANGIBLE ASSETS      
Mortgage banking income 1,300 3,300 1,600
Changes in other intangible assets      
Balance, beginning of period 11,865 14,718 15,596
Additions 1,341 3,314 1,582
Amortization (3,468) (6,167) (2,460)
Balance, end of period 9,738 11,865 14,718
Gross carrying value, accumulated amortization and net carrying value related to intangible assets      
Gross Carrying Value 72,250 70,909  
Accumulated Amortization (62,512) (59,044)  
Net Carrying Value 9,738 11,865 14,718
Estimated Amortization Expense      
2019 1,915    
2020 1,476    
2021 1,157    
2022 923    
2023 745    
Thereafter 3,522    
Net Carrying Value 9,738 11,865 14,718
Other disclosures      
Fair market value, beginning of period 12,003 15,820  
Fair market value, end of period $ 10,504 $ 12,003 $ 15,820
Measurement Input, Discount Rate [Member] | Mortgage Servicing Rights      
OTHER INTANGIBLE ASSETS      
Debt Instrument, Measurement Input 0.095 0.096  
Measurement Input, Constant Prepayment Rate [Member] | Mortgage Servicing Rights      
OTHER INTANGIBLE ASSETS      
Debt Instrument, Measurement Input 0.190 0.176