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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Branch
Dec. 31, 2014
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 37,144 $ 37,144    
Goodwill (including portion attributable to discontinued operations)   39,244 $ 39,244 $ 31,591
Goodwill adjustments for purchase accounting 0 0 7,653  
Impairment on intangible assets 336 690 $ 258  
Number of branch locations sold | Branch     2  
Aggregate amortization expense 3,928 4,851 $ 5,836  
Banking        
Finite-Lived Intangible Assets [Line Items]        
Goodwill   37,100    
Mortgage Banking        
Finite-Lived Intangible Assets [Line Items]        
Goodwill   2,100    
Goodwill, impairment loss $ 2,100      
Core deposit intangibles        
Finite-Lived Intangible Assets [Line Items]        
Weighted average amortization period 5 years 11 months 24 days      
Impairment on intangible assets     $ 258  
Core deposit intangibles | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Amortization period of other intangible assets 4 years      
Core deposit intangibles | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Amortization period of other intangible assets 10 years      
Customer relationship intangible        
Finite-Lived Intangible Assets [Line Items]        
Impairment on intangible assets $ 246      
Trade name intangibles        
Finite-Lived Intangible Assets [Line Items]        
Impairment on intangible assets $ 90      
Trade name intangibles | Mortgage Banking        
Finite-Lived Intangible Assets [Line Items]        
Impairment on intangible assets   $ 690