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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
OTHER INTANGIBLE ASSETS          
Loans Serviced For Others       $ 2,080,000 $ 2,120,000
Mortgage banking income $ 6,962 $ 8,069 $ 7,254    
Mortgage servicing rights       15,843 15,779
Changes in other intangible assets          
Balance, beginning of period 20,459 25,152      
Additions 2,352 3,048      
Amortization (4,962) (7,741)      
Balance, end of period 17,849 20,459 25,152    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       109,043 106,691
Accumulated Amortization       (91,194) (86,232)
Net Carrying Value 20,459 25,152 25,152 17,849 20,459
Estimated Amortization Expense          
2016       4,177  
2017       1,705  
2018       1,407  
2019       1,183  
2020       990  
Thereafter       8,387  
Net Carrying Value 20,459 25,152 25,152 17,849 20,459
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 4,069 7,631 6,107    
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period 4,680 7,355      
Additions 0 0      
Amortization (2,674) (2,675) (2,674)    
Balance, end of period 2,006 4,680 7,355    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       44,642 44,642
Accumulated Amortization       (42,636) (39,962)
Net Carrying Value 4,680 7,355 7,355 2,006 4,680
Estimated Amortization Expense          
2016       2,006  
2017       0  
2018       0  
2019       0  
2020       0  
Thereafter       0  
Net Carrying Value 4,680 7,355 7,355 2,006 4,680
Mortgage Servicing Rights          
OTHER INTANGIBLE ASSETS          
Mortgage banking income 2,400 3,000 2,300    
Changes in other intangible assets          
Balance, beginning of period 15,779 17,797      
Additions 2,352 3,048      
Amortization (2,288) (5,066)      
Balance, end of period 15,843 15,779 17,797    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       64,401 62,049
Accumulated Amortization       (48,558) (46,270)
Net Carrying Value 15,779 17,797 17,797 15,843 15,779
Estimated Amortization Expense          
2016       2,171  
2017       1,705  
2018       1,407  
2019       1,183  
2020       990  
Thereafter       8,387  
Net Carrying Value 15,779 17,797 17,797 $ 15,843 $ 15,779
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period $ 18,087 18,345      
Fair market value, end of period   $ 18,087 $ 18,345    
Weighted average discount rate 9.50% 9.50%      
Weighted average prepayment speed assumption 16.00% 14.30%