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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Changes in other intangible assets            
Balance, beginning of period     $ 29,697      
Additions     1,847      
Amortization     (5,347)      
Balance, end of period $ 26,197   26,197      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 1,551 $ 1,685 4,775 $ 4,151    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         $ 103,176 $ 101,329
Accumulated Amortization         (76,979) (71,632)
Other intangible assets 26,197   29,697   26,197 29,697
Estimated Amortization Expense            
2015 (remainder)         1,828  
2016         6,838  
2017         5,830  
2018         4,494  
2019         1,906  
2020         1,492  
Thereafter         3,809  
Other intangible assets 26,197   29,697   26,197 29,697
Core Deposit Premium            
Changes in other intangible assets            
Balance, beginning of period     10,029      
Additions     0      
Amortization     (2,006)      
Balance, end of period 8,023   8,023      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         44,642 44,642
Accumulated Amortization         (36,619) (34,613)
Other intangible assets 8,023   10,029   8,023 10,029
Estimated Amortization Expense            
2015 (remainder)         669  
2016         2,674  
2017         2,674  
2018         2,006  
2019         0  
2020         0  
Thereafter         0  
Other intangible assets 8,023   10,029   8,023 10,029
Mortgage Servicing Rights            
Changes in other intangible assets            
Balance, beginning of period     19,668      
Additions     1,847      
Amortization (1,000) (700) (3,341) (1,900)    
Balance, end of period 18,174   18,174      
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 600 700 1,800 1,600    
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 18,495 $ 20,471 $ 18,495 $ 20,471    
Weighted average discount rate     9.50% 9.50%    
Weighted average prepayment speed assumption     14.30% 12.90%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         58,534 56,687
Accumulated Amortization         (40,360) (37,019)
Other intangible assets 18,174   $ 19,668   18,174 19,668
Estimated Amortization Expense            
2015 (remainder)         1,159  
2016         4,164  
2017         3,156  
2018         2,488  
2019         1,906  
2020         1,492  
Thereafter         3,809  
Other intangible assets $ 18,174   $ 19,668   $ 18,174 $ 19,668