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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
OTHER INTANGIBLE ASSETS          
Loans Serviced For Others       $ 2,010,000 $ 2,080,000
Mortgage banking income $ 7,315 $ 6,962 $ 8,069    
Changes in other intangible assets          
Balance, beginning of period 17,849 20,459 25,152    
Additions 1,612 2,352 3,048    
Amortization (3,865) (4,962) (7,741)    
Balance, end of period 15,596 17,849 20,459    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       110,655 109,043
Accumulated Amortization       (95,059) (91,194)
Net Carrying Value 17,849 20,459 25,152 15,596 17,849
Estimated Amortization Expense          
Net Carrying Value 17,849 20,459 25,152 15,596 17,849
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period 2,006 4,680 7,355    
Additions 0 0 0    
Amortization (2,006) (2,674) (2,675)    
Balance, end of period 0 2,006 4,680    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       44,642 44,642
Accumulated Amortization       (44,642) (42,636)
Net Carrying Value 2,006 4,680 7,355 0 2,006
Estimated Amortization Expense          
Net Carrying Value 2,006 4,680 7,355 0 2,006
Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Mortgage banking income 1,600 2,400 3,000    
Changes in other intangible assets          
Balance, beginning of period 15,843 15,779 17,797    
Additions 1,612 2,352 3,048    
Amortization (1,859) (2,288) (5,066)    
Balance, end of period 15,596 15,843 15,779    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       66,013 64,401
Accumulated Amortization       (50,417) (48,558)
Net Carrying Value 15,843 15,779 17,797 15,596 15,843
Estimated Amortization Expense          
2019       1,615  
2020       1,315  
2021       1,100  
2022       931  
2023       781  
Thereafter       9,854  
Net Carrying Value 15,843 15,779 17,797 $ 15,596 $ 15,843
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period 17,161 18,087      
Fair market value, end of period $ 17,696 $ 17,161 $ 18,087    
Weighted average discount rate 9.50% 9.50%      
Weighted average prepayment speed assumption 14.50% 16.00%