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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jun. 30, 2018
Dec. 31, 2017
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 959 $ 1,084 $ 1,931 $ 2,396      
Changes in other intangible assets              
Balance, beginning of period     17,849        
Additions     807        
Amortization     (2,231)        
Balance, end of period 16,425   16,425   $ 17,849    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value           $ 109,850 $ 109,043
Accumulated Amortization           (93,425) (91,194)
Other intangible assets 16,425   17,849   17,849 16,425 17,849
Estimated Amortization Expense              
2018 (remainder)           1,439  
2019           1,323  
2020           1,113  
2021           934  
2022           793  
2023           698  
Thereafter           10,125  
Other intangible assets 16,425   17,849   17,849 16,425 17,849
Core Deposit Premium              
Changes in other intangible assets              
Balance, beginning of period     2,006        
Additions     0        
Amortization     (1,337)        
Balance, end of period 669   669   2,006    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value           44,642 44,642
Accumulated Amortization           (43,973) (42,636)
Other intangible assets 669   2,006   2,006 669 2,006
Estimated Amortization Expense              
2018 (remainder)           669  
2019           0  
2020           0  
2021           0  
2022           0  
2023           0  
Thereafter           0  
Other intangible assets 669   2,006   2,006 669 2,006
Mortgage Servicing Rights              
OTHER INTANGIBLE ASSETS              
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans 400 600 800 1,200      
Changes in other intangible assets              
Balance, beginning of period     15,843        
Additions     807        
Amortization (400) (500) (894) (1,100)      
Balance, end of period 15,756   15,756   15,843    
Fair market value and key assumptions used in determining the fair market value              
Fair market value, beginning of period     17,161 18,087 18,087    
Fair market value, end of period 18,560 $ 17,024 $ 18,560 $ 17,024 $ 17,161    
Weighted average discount rate     9.50% 9.50% 9.50%    
Forecasted constant prepayment rate assumption     13.90% 16.10% 16.00%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value           65,208 64,401
Accumulated Amortization           (49,452) (48,558)
Other intangible assets 15,756   $ 15,843   $ 15,843 15,756 15,843
Estimated Amortization Expense              
2018 (remainder)           770  
2019           1,323  
2020           1,113  
2021           934  
2022           793  
2023           698  
Thereafter           10,125  
Other intangible assets $ 15,756   $ 15,843   $ 15,843 $ 15,756 $ 15,843