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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Feb. 21, 2017
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2017
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Reserve requirements of vault cash and/or deposits, included in cash and equivalents       $ 15,800   $ 12,700
Property, Plant and Equipment [Line Items]            
Contract with customer   $ 241        
Conversion ratio on stock split     1.5      
Premises | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful live of premises and equipment       25 years    
Premises | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful live of premises and equipment       39 years    
Furniture and equipment | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful live of premises and equipment       3 years    
Furniture and equipment | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful live of premises and equipment       7 years    
Retained earnings            
Property, Plant and Equipment [Line Items]            
Decrease to accumulated comprehensive income after adoption of ASU 2018-02 $ 980     $ (980)    
Retained earnings | Accounting Standards Update 2014-09            
Property, Plant and Equipment [Line Items]            
Modified retrospective basis adoption of Revenue Recognition Accounting Codification Standard 606           $ 184
Scenario, Forecast | Subsequent Event | Accounting Standards Update 2016-02 [Member]            
Property, Plant and Equipment [Line Items]            
Operating Lease, Right-of-Use Asset         $ 9,000  
Operating Lease, Liability         $ 9,000