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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
OTHER INTANGIBLE ASSETS            
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 1,084 $ 1,845 $ 2,396 $ 3,311    
Changes in other intangible assets            
Balance, beginning of period     20,459      
Additions     1,220      
Amortization     (2,404)      
Balance, end of period 19,275   19,275      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         $ 107,911 $ 106,691
Accumulated Amortization         (88,636) (86,232)
Other intangible assets 19,275   20,459   19,275 20,459
Estimated Amortization Expense            
2017 (remainder)         2,630  
2018         4,154  
2019         1,767  
2020         1,448  
2021         1,201  
2022         1,039  
Thereafter         7,036  
Other intangible assets 19,275   20,459   19,275 20,459
Core Deposit Premium            
Changes in other intangible assets            
Balance, beginning of period     4,680      
Additions     0      
Amortization     (1,337)      
Balance, end of period 3,343   3,343      
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         44,642 44,642
Accumulated Amortization         (41,299) (39,962)
Other intangible assets 3,343   4,680   3,343 4,680
Estimated Amortization Expense            
2017 (remainder)         1,337  
2018         2,006  
2019         0  
2020         0  
2021         0  
2022         0  
Thereafter         0  
Other intangible assets 3,343   4,680   3,343 4,680
Mortgage Servicing Rights            
OTHER INTANGIBLE ASSETS            
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 600 700 1,200 1,200    
Changes in other intangible assets            
Balance, beginning of period     15,779      
Additions     1,220      
Amortization (500) (1,800) (1,067) (3,300)    
Balance, end of period 15,932   15,932      
Fair market value and key assumptions used in determining the fair market value            
Fair market value, beginning of period     18,087 18,345    
Fair market value, end of period 17,024 $ 16,123 $ 17,024 $ 16,123    
Weighted average discount rate     9.50% 9.50%    
Forecasted constant prepayment rate assumption     16.10% 16.50%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets            
Gross Carrying Value         63,269 62,049
Accumulated Amortization         (47,337) (46,270)
Other intangible assets 15,932   $ 15,779   15,932 15,779
Estimated Amortization Expense            
2017 (remainder)         1,293  
2018         2,148  
2019         1,767  
2020         1,448  
2021         1,201  
2022         1,039  
Thereafter         7,036  
Other intangible assets $ 15,932   $ 15,779   $ 15,932 $ 15,779