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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
OTHER INTANGIBLE ASSETS            
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 1,845 $ 1,630 $ 3,311 $ 3,224    
Changes in other intangible assets            
Balance, beginning of period     25,152      
Additions     1,245      
Amortization     (4,601)      
Balance, end of period 21,796   21,796      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         $ 104,888 $ 103,643
Accumulated Amortization         (83,092) (78,491)
Other intangible assets 21,796   25,152   21,796 25,152
Estimated Amortization Expense            
2016 (remainder)         3,610  
2017         6,490  
2018         5,036  
2019         2,484  
2020         2,074  
2021         1,647  
Thereafter         455  
Other intangible assets 21,796   25,152   21,796 25,152
Core Deposit Premium            
Changes in other intangible assets            
Balance, beginning of period     7,355      
Additions     0      
Amortization     (1,337)      
Balance, end of period 6,018   6,018      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         44,642 44,642
Accumulated Amortization         (38,624) (37,287)
Other intangible assets 6,018   7,355   6,018 7,355
Estimated Amortization Expense            
2016 (remainder)         1,338  
2017         2,674  
2018         2,006  
2019         0  
2020         0  
2021         0  
Thereafter         0  
Other intangible assets 6,018   7,355   6,018 7,355
Mortgage Servicing Rights            
OTHER INTANGIBLE ASSETS            
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 700 600 1,200 1,200    
Changes in other intangible assets            
Balance, beginning of period     17,797      
Additions     1,245      
Amortization (1,755) (900) (3,264) (2,300)    
Balance, end of period 15,778   15,778      
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 16,123 $ 19,202 $ 16,123 $ 19,202    
Weighted average discount rate     9.50% 9.50%    
Forecasted constant prepayment rate assumption     16.50% 13.80%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         60,246 59,001
Accumulated Amortization         (44,468) (41,204)
Other intangible assets 15,778   $ 17,797   15,778 17,797
Estimated Amortization Expense            
2016 (remainder)         2,272  
2017         3,816  
2018         3,030  
2019         2,484  
2020         2,074  
2021         1,647  
Thereafter         455  
Other intangible assets $ 15,778   $ 17,797   $ 15,778 $ 17,797