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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
OTHER INTANGIBLE ASSETS          
Loans Serviced For Others       $ 1,890,000 $ 2,010,000
Mortgage banking income $ 5,983 $ 7,315 $ 6,962    
Changes in other intangible assets          
Balance, beginning of period 15,596 17,849 20,459    
Additions 1,582 1,612 2,352    
Amortization (2,460) (3,865) (4,962)    
Balance, end of period 14,718 15,596 17,849    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       112,237 110,655
Accumulated Amortization       (97,519) (95,059)
Net Carrying Value 15,596 15,596 17,849 14,718 15,596
Estimated Amortization Expense          
Net Carrying Value 15,596 15,596 17,849 14,718 15,596
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period 0 2,006 4,680    
Additions 0 0 0    
Amortization 0 (2,006) (2,674)    
Balance, end of period 0 0 2,006    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       44,642 44,642
Accumulated Amortization       (44,642) (44,642)
Net Carrying Value 0 0 2,006 0 0
Estimated Amortization Expense          
Net Carrying Value 0 0 2,006 0 0
Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Mortgage banking income 1,600 1,600 2,400    
Changes in other intangible assets          
Balance, beginning of period 15,596 15,843 15,779    
Additions 1,582 1,612 2,352    
Amortization (2,460) (1,859) (2,288)    
Balance, end of period 14,718 15,596 15,843    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       67,595 66,013
Accumulated Amortization       (52,877) (50,417)
Net Carrying Value 14,718 15,596 15,843 14,718 15,596
Estimated Amortization Expense          
2019       2,407  
2020       1,964  
2021       1,635  
2022       1,382  
2023       1,154  
Thereafter       6,176  
Net Carrying Value 14,718 15,596 15,843 $ 14,718 $ 15,596
Other disclosures          
Fair market value, beginning of period 17,696 17,161      
Fair market value, end of period $ 15,820 $ 17,696 $ 17,161    
Measurement Input, Discount Rate [Member] | Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Debt Instrument, Measurement Input       0.095 0.095
Measurement Input, Constant Prepayment Rate [Member] | Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Debt Instrument, Measurement Input       0.142 0.145