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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Oct. 11, 2019
USD ($)
Oct. 11, 2019
USD ($)
Oct. 10, 2019
USD ($)
$ / shares
shares
Sep. 13, 2019
Oct. 27, 2017
USD ($)
Dec. 31, 2019
USD ($)
segment
subsidiary
item
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Feb. 15, 2019
USD ($)
ACCOUNTING POLICIES                  
Number of subsidiary | subsidiary           5      
Issuance of common stock (in shares) | shares     9,429,794            
Share price | $ / shares     $ 16.00            
Proceeds from initial public offering     $ 138,493,000            
Special dividend fund     $ 170,000,000            
Special dividend per share | $ / shares     $ 9.43            
Pro forma dilutive instruments | shares           0 0 0  
Transfer amount           $ 0 $ 0 $ 0  
Restricted Investments           $ 2,425,000 2,719,000    
Number of primary components of allowance for loan losses | item           2      
Actual loss history period           4 years      
Total loan exposure subject to credit risk           $ 500,000      
Definite useful lives of other identifiable intangible assets           10 years      
Branch buildings classified as held for sale           $ 121,000 749,000    
Impairment loss           $ 37,000 52,000 1,936,000  
Contractual interest rates of FDIC indemnification asset           0.00%      
Cash payments to FDIC pursuant to termination of agreement         $ 4,929,000        
Write-down of FDIC indemnification asset         $ 459,000        
Percentage matching the compensation contributed by employees           5.00%      
Provision for prepaid dividend           $ 0      
Deferred tax asset $ 534,000 $ 534,000       3,406,000      
Income tax benefit $ 500,000 $ 534,000       (5,256,000) (869,000) $ (870,000)  
Uncertain tax positions           $ 0 $ 0    
Dilutive instruments outstanding | shares           0 0 0  
Number of segments | segment           1      
Common stock and preferred stock, shares authorized | shares     150,000,000            
Common stock, shares converted | shares     1            
Common stock, shares authorized | shares     125,000,000            
Common stock, par value (in dollars per share) | $ / shares     $ 0.01            
Preferred stock, shares authorized | shares     25,000,000     25,000,000      
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01     $ 0.01      
Common Stock                  
ACCOUNTING POLICIES                  
Stock split ratio       20          
Series A Nonvoting                  
ACCOUNTING POLICIES                  
Stock split ratio       20          
Common stock, shares authorized | shares             24,000,000    
Common stock, par value (in dollars per share) | $ / shares             $ 0.01    
Single-family loss-share agreement                  
ACCOUNTING POLICIES                  
Original term           10 years      
Non-single family residential loss-share agreement                  
ACCOUNTING POLICIES                  
Original term           8 years      
Related parties                  
ACCOUNTING POLICIES                  
Loans           $ 4,162,000 $ 830,000    
Financial asset acquired with credit deterioration | Loans                  
ACCOUNTING POLICIES                  
Allowance for credit loss           $ 0      
First Community Title Services, Inc.                  
ACCOUNTING POLICIES                  
Consideration received                 $ 498,000