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KSOP FORMERLY THE ESOP AND 401(K) PLAN (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 26, 1996
Employee Stock Ownership Plan [Abstract]        
Pay off the outstanding loan amount     $ 11,319  
ESOP benefit expense $ 0 $ 0 1,138  
KSOP [Member]        
Employee Stock Ownership Plan [Abstract]        
Investment in holding company's common stock 41,863 56,741    
Employer discretionary contributions $ 1,743 $ 1,689 $ 638  
Percentage of employer safe harbor contributions 3.00% 3.00% 3.00%  
Percentage of employer discretionary contribution 3.00% 3.00%    
ESOP [Member]        
Employee Stock Ownership Plan [Abstract]        
Borrowings from holding company       $ 11,638
Number of shares purchased in holding company common stock (in shares)       3,927,825
Extended loan repayment term 30 years      
Share loan payoff (in shares)     140,260  
Pay off the outstanding loan amount     $ 2,819  
Shares allocated to active participants in the plan (in shares)     563,127  
One-time non-cash, non-tax deductible compensation expenses     $ 11,319  
ESOP benefit expense $ 0 $ 0 1,783  
Dividends paid     $ 438  
ESOP [Member] | Vesting Percentage Per Year of Service [Member]        
Employee Stock Ownership Plan [Abstract]        
ESOP distributions vesting percentage per year of service, beginning after two years 25.00%      
ESOP [Member] | Minimum [Member]        
Employee Stock Ownership Plan [Abstract]        
ESOP distributions vesting period 2 years      
ESOP [Member] | Maximum [Member]        
Employee Stock Ownership Plan [Abstract]        
Loan repayment term 10 years      
ESOP distributions vesting period 5 years      
ESOP distribution vesting age limit 65 years