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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2020
USD ($)
Feb. 01, 2019
Oct. 01, 2018
Dec. 31, 2020
USD ($)
office
Bank
Segment
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncement Early Adoption [Line Items]              
Number of offices in which entity operates | office       28      
Accrued interest receivable for loans outstanding       $ 34,500 $ 15,500    
Debt securities available for Sale accrued interest receivable       5,500      
Right-of-use assets       11,610 11,180    
Lease liabilities       11,850 11,477    
Other real estate owned       $ 9,200      
Percentage of recognition threshold for which the largest amount of tax benefit is realized upon ultimate settlement with the related tax authority       50.00%      
Number of reportable segments | Segment       1      
Off-balance sheet exposure for allowance for credit losses $ 3,866            
ASU 2016-02              
New Accounting Pronouncement Early Adoption [Line Items]              
Right-of-use assets           $ 15,300  
Lease liabilities           $ 15,700  
Accounting Standards Update 2016-13              
New Accounting Pronouncement Early Adoption [Line Items]              
Allowance for credit losses on loans 3,100            
Off-balance sheet exposure for allowance for credit losses 3,866            
Cumulative effect of adopting new accounting principle in period of adoption         5,508    
Increase in allowance for credit losses for loans 2,100            
Accounting Standards Update 2016-13 | Retained Earnings              
New Accounting Pronouncement Early Adoption [Line Items]              
Cumulative effect of adopting new accounting principle in period of adoption $ 5,500       $ 5,508    
ASU 2017-08              
New Accounting Pronouncement Early Adoption [Line Items]              
Cumulative effect of adopting new accounting principle in period of adoption             $ 1,715
ASU 2017-08 | Retained Earnings              
New Accounting Pronouncement Early Adoption [Line Items]              
Cumulative effect of adopting new accounting principle in period of adoption       $ 1,700     $ 1,715
Minimum              
New Accounting Pronouncement Early Adoption [Line Items]              
Premises and equipment, useful life       3 years      
Minimum | Core Deposits              
New Accounting Pronouncement Early Adoption [Line Items]              
Intangibles, useful life       7 years      
Maximum              
New Accounting Pronouncement Early Adoption [Line Items]              
Premises and equipment, useful life       40 years      
Maximum | Core Deposits              
New Accounting Pronouncement Early Adoption [Line Items]              
Intangibles, useful life       10 years      
Post Oak Bancshares, Inc.              
New Accounting Pronouncement Early Adoption [Line Items]              
Effective date of acquisition     Oct. 01, 2018 Oct. 01, 2018      
Post Oak Bancshares, Inc. | Minimum              
New Accounting Pronouncement Early Adoption [Line Items]              
Intangibles, useful life     10 years        
Lowery Bank              
New Accounting Pronouncement Early Adoption [Line Items]              
Effective date of acquisition   Feb. 01, 2019   Feb. 01, 2019      
Houston              
New Accounting Pronouncement Early Adoption [Line Items]              
Number of banks in which entity operates | Bank       27      
Beaumont              
New Accounting Pronouncement Early Adoption [Line Items]              
Number of offices in which entity operates | office       1