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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 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 $ 2,212 $ 1,551 $ 5,523 $ 4,775    
Changes in other intangible assets            
Balance, beginning of period     25,152      
Additions     2,126      
Amortization     (6,291)      
Balance, end of period 20,987   20,987      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         $ 105,769 $ 103,643
Accumulated Amortization         (84,782) (78,491)
Other intangible assets 20,987   25,152   20,987 25,152
Estimated Amortization Expense            
2016 (remainder)         1,586  
2017         5,884  
2018         4,516  
2019         2,055  
2020         1,688  
2021         1,427  
Thereafter         3,831  
Other intangible assets 20,987   25,152   20,987 25,152
Core Deposit Premium            
Changes in other intangible assets            
Balance, beginning of period     7,355      
Additions     0      
Amortization     (2,006)      
Balance, end of period 5,349   5,349      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         44,642 44,642
Accumulated Amortization         (39,293) (37,287)
Other intangible assets 5,349   7,355   5,349 7,355
Estimated Amortization Expense            
2016 (remainder)         669  
2017         2,674  
2018         2,006  
2019         0  
2020         0  
2021         0  
Thereafter         0  
Other intangible assets 5,349   7,355   5,349 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 900 600 2,100 1,800    
Changes in other intangible assets            
Balance, beginning of period     17,797      
Additions     2,126      
Amortization (1,021) (1,000) (4,285) (3,300)    
Balance, end of period 15,638   15,638      
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 16,025 $ 18,495 $ 16,025 $ 18,495    
Weighted average discount rate     9.50% 9.50%    
Forecasted constant prepayment rate assumption     16.70% 14.30%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         61,127 59,001
Accumulated Amortization         (45,489) (41,204)
Other intangible assets 15,638   $ 17,797   15,638 17,797
Estimated Amortization Expense            
2016 (remainder)         917  
2017         3,210  
2018         2,510  
2019         2,055  
2020         1,688  
2021         1,427  
Thereafter         3,831  
Other intangible assets $ 15,638   $ 17,797   $ 15,638 $ 17,797