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CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
OTHER INTANGIBLE ASSETS          
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans $ 972 $ 1,312      
Changes in other intangible assets          
Balance, beginning of period 17,849        
Additions 435        
Amortization (1,126)        
Balance, end of period 17,158   $ 17,849    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       $ 109,478 $ 109,043
Accumulated Amortization       (92,320) (91,194)
Other intangible assets 17,849   17,849 17,158 17,849
Estimated Amortization Expense          
2018 (remainder)       2,413  
2019       1,211  
2020       1,017  
2021       867  
2022       733  
2023       663  
Thereafter       10,254  
Other intangible assets 17,849   17,849 17,158 17,849
Core Deposit Premium          
Changes in other intangible assets          
Balance, beginning of period 2,006        
Additions 0        
Amortization (669)        
Balance, end of period 1,337   2,006    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       44,642 44,642
Accumulated Amortization       (43,305) (42,636)
Other intangible assets 2,006   2,006 1,337 2,006
Estimated Amortization Expense          
2018 (remainder)       1,337  
2019       0  
2020       0  
2021       0  
2022       0  
2023       0  
Thereafter       0  
Other intangible assets 2,006   2,006 1,337 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      
Changes in other intangible assets          
Balance, beginning of period 15,843        
Additions 435        
Amortization (457) (500)      
Balance, end of period 15,821   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 $ 18,463 $ 17,627 $ 17,161    
Weighted average discount rate 9.50% 9.50% 9.50%    
Forecasted constant prepayment rate assumption 14.20% 15.00% 16.00%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets          
Gross Carrying Value       64,836 64,401
Accumulated Amortization       (49,015) (48,558)
Other intangible assets $ 15,843   $ 15,843 15,821 15,843
Estimated Amortization Expense          
2018 (remainder)       1,076  
2019       1,211  
2020       1,017  
2021       867  
2022       733  
2023       663  
Thereafter       10,254  
Other intangible assets $ 15,843   $ 15,843 $ 15,821 $ 15,843