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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Changes in other intangible assets          
Balance, beginning of period $ 29,697 $ 32,783      
Additions 2,314 2,246      
Amortization (6,859) (5,332)      
Balance, end of period 25,152 29,697 $ 32,783    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       $ 103,643 $ 101,329
Accumulated Amortization       (78,491) (71,632)
Net Carrying Value 29,697 32,783 32,783 25,152 29,697
Estimated Amortization Expense          
2016       5,067  
2017       4,394  
2018       3,272  
2019       878  
2020       584  
Thereafter       10,957  
Net Carrying Value 29,697 32,783 32,783 25,152 29,697
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 6,107 5,545 9,986    
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period 2,360,000        
Fair market value, end of period 2,170,000 2,360,000      
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period 10,029 12,704      
Additions 0 0      
Amortization (2,674) (2,675)      
Balance, end of period 7,355 10,029 12,704    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       44,642 44,642
Accumulated Amortization       (37,287) (34,613)
Net Carrying Value 10,029 12,704 12,704 7,355 10,029
Estimated Amortization Expense          
2016       2,674  
2017       2,674  
2018       2,007  
2019       0  
2020       0  
Thereafter       0  
Net Carrying Value 10,029 12,704 12,704 7,355 10,029
Mortgage Servicing Rights          
Changes in other intangible assets          
Balance, beginning of period 19,668 20,079      
Additions 2,314 2,246      
Amortization (4,185) (2,657)      
Balance, end of period 17,797 19,668 20,079    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       59,001 56,687
Accumulated Amortization       (41,204) (37,019)
Net Carrying Value 19,668 20,079 20,079 17,797 19,668
Estimated Amortization Expense          
2016       2,393  
2017       1,720  
2018       1,265  
2019       878  
2020       584  
Thereafter       10,957  
Net Carrying Value 19,668 20,079 20,079 $ 17,797 $ 19,668
Other disclosures          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 2,300 2,200 2,700    
Fair market value and key assumptions used in determining the fair market value          
Fair market value, beginning of period 19,975 21,399      
Fair market value, end of period $ 18,345 $ 19,975 $ 21,399    
Weighted average discount rate 9.50% 9.50%      
Weighted average prepayment speed assumption 14.30% 13.20%