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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Changes in other intangible assets          
Balance, beginning of period $ 25,152 $ 29,697      
Additions 3,048 2,314      
Amortization (7,741) (6,859)      
Balance, end of period 20,459 25,152 $ 29,697    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       $ 106,691 $ 103,643
Accumulated Amortization       (86,232) (78,491)
Net Carrying Value 25,152 29,697 29,697 20,459 25,152
Estimated Amortization Expense          
2016       5,297  
2017       4,182  
2018       1,848  
2019       1,597  
2020       1,345  
Thereafter       6,190  
Net Carrying Value 25,152 29,697 29,697 20,459 25,152
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 7,631 6,107 5,545    
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period 2,170,000        
Fair market value, end of period 2,120,000 2,170,000      
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period 7,355 10,029      
Additions 0 0      
Amortization (2,675) (2,674) (2,675)    
Balance, end of period 4,680 7,355 10,029    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       44,642 44,642
Accumulated Amortization       (39,962) (37,287)
Net Carrying Value 7,355 10,029 10,029 4,680 7,355
Estimated Amortization Expense          
2016       2,674  
2017       2,006  
2018       0  
2019       0  
2020       0  
Thereafter       0  
Net Carrying Value 7,355 10,029 10,029 4,680 7,355
Mortgage Servicing Rights          
Changes in other intangible assets          
Balance, beginning of period 17,797 19,668      
Additions 3,048 2,314      
Amortization (5,066) (4,185)      
Balance, end of period 15,779 17,797 19,668    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       62,049 59,001
Accumulated Amortization       (46,270) (41,204)
Net Carrying Value 17,797 19,668 19,668 15,779 17,797
Estimated Amortization Expense          
2016       2,623  
2017       2,176  
2018       1,848  
2019       1,597  
2020       1,345  
Thereafter       6,190  
Net Carrying Value 17,797 19,668 19,668 $ 15,779 $ 17,797
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 3,000 2,300 2,200    
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period 18,345 19,975      
Fair market value, end of period $ 18,087 $ 18,345 $ 19,975    
Weighted average discount rate 9.50% 9.50%      
Weighted average prepayment speed assumption 14.30% 14.30%