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BUSINESS COMBINATIONS, West Texas State Bank (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Nov. 12, 2019
USD ($)
Branch
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Combinations [Abstract]          
Increase in goodwill   $ 751   $ 0  
Assets Acquired and Liabilities Assumed [Abstract]          
Cash paid   687 $ 2,800    
Liabilities assumed [Abstract]          
Goodwill recorded in acquisition   19,508   18,757 $ 0
West Texas State Bank [Member]          
Business Combinations [Abstract]          
Number of additional branches | Branch 6        
Ownership interest 100.00%        
Goodwill recognized expected to be deductible for income tax purposes $ 0        
Acquisition expenses       $ 955  
Non-credit impaired loans fair value 196,200        
Contractual balance of non-credit impaired loans 198,400        
Discount on acquired loans being recognized into interest income 2,200        
Increase in goodwill   751      
Decrease in loans   (900)      
Decrease in other liabilities   $ (160)      
Assets Acquired and Liabilities Assumed [Abstract]          
Cash paid 76,100        
Assets acquired [Abstract]          
Cash and cash equivalents 77,903        
Interest-bearing time deposits in banks 52,700        
Federal funds purchased 26,468        
Securities available for sale 68,398        
Loans held for investment 195,228        
Bank-owned life insurance 10,932        
Premises and equipment, net 4,132        
Accrued interest receivable 1,114        
Other assets 2,648        
Total assets acquired 446,202        
Liabilities assumed [Abstract]          
Deposits 386,176        
Accrued interest payable 55        
Deferred tax liability 762        
Other liabilities 2,424        
Total liabilities assumed 389,417        
Net assets acquired 56,785        
Goodwill recorded in acquisition 19,315        
West Texas State Bank [Member] | Core Deposit Intangible [Member]          
Assets acquired [Abstract]          
Intangible assets $ 6,679