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OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 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 $ 705 $ 2,212 $ 3,101 $ 5,523      
Changes in other intangible assets              
Balance, beginning of period     20,459        
Additions     1,857        
Amortization     (3,549)        
Balance, end of period 18,767   18,767   $ 20,459    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value           $ 108,548 $ 106,691
Accumulated Amortization           (89,781) (86,232)
Other intangible assets 18,767   20,459   20,459 18,767 20,459
Estimated Amortization Expense              
2017 (remainder)           1,440  
2018           4,601  
2019           2,047  
2020           1,677  
2021           1,393  
2022           1,179  
Thereafter           6,430  
Other intangible assets 18,767   20,459   20,459 18,767 20,459
Core Deposit Premium              
Changes in other intangible assets              
Balance, beginning of period     4,680        
Additions     0        
Amortization     (2,006)        
Balance, end of period 2,674   2,674   4,680    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value           44,642 44,642
Accumulated Amortization           (41,968) (39,962)
Other intangible assets 2,674   4,680   4,680 2,674 4,680
Estimated Amortization Expense              
2017 (remainder)           668  
2018           2,006  
2019           0  
2020           0  
2021           0  
2022           0  
Thereafter           0  
Other intangible assets 2,674   4,680   4,680 2,674 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 600 900 1,900 2,100      
Changes in other intangible assets              
Balance, beginning of period     15,779        
Additions     1,857        
Amortization (500) (1,000) (1,543) (4,300)      
Balance, end of period 16,093   16,093   15,779    
Fair market value and key assumptions used in determining the fair market value              
Fair market value, beginning of period     $ 18,087 18,345 18,345    
Fair market value, end of period   $ 16,025   $ 16,025 $ 18,087    
Weighted average discount rate     9.50% 9.50% 9.50%    
Forecasted constant prepayment rate assumption     16.50% 16.70% 14.30%    
Gross carrying value, accumulated amortization and net carrying value related to intangible assets              
Gross Carrying Value           63,906 62,049
Accumulated Amortization           (47,813) (46,270)
Other intangible assets 16,093   $ 15,779   $ 15,779 16,093 15,779
Estimated Amortization Expense              
2017 (remainder)           772  
2018           2,595  
2019           2,047  
2020           1,677  
2021           1,393  
2022           1,179  
Thereafter           6,430  
Other intangible assets $ 16,093   $ 15,779   $ 15,779 $ 16,093 $ 15,779