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LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Troubled Debt Restructurings (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
contract
Troubled Debt Restructuring [Abstract]      
Extend Amortization Period $ 7,574 $ 10,617 $ 801
Interest Rate Reductions 0 112 0
Combination 1,381 540 293
Total Modifications $ 8,955 $ 11,269 $ 1,094
Number of Loans | contract 18 22 10
1-4 family residential real estate loans      
Troubled Debt Restructuring [Abstract]      
Extend Amortization Period $ 0 $ 0  
Interest Rate Reductions 0 79  
Combination 121 0  
Total Modifications $ 121 $ 79  
Number of Loans | contract 2 1  
Commercial real estate loans      
Troubled Debt Restructuring [Abstract]      
Extend Amortization Period $ 7,518 $ 10,398  
Interest Rate Reductions 0 0  
Combination 93 274  
Total Modifications $ 7,611 $ 10,672  
Number of Loans | contract 2 3  
Commercial loans      
Troubled Debt Restructuring [Abstract]      
Extend Amortization Period $ 52 $ 211 $ 778
Interest Rate Reductions 0 0 0
Combination 1,143 215 241
Total Modifications $ 1,195 $ 426 $ 1,019
Number of Loans | contract 9 13 4
Loans to individuals      
Troubled Debt Restructuring [Abstract]      
Extend Amortization Period $ 4 $ 8 $ 23
Interest Rate Reductions 0 33 0
Combination 24 51 52
Total Modifications $ 28 $ 92 $ 75
Number of Loans | contract 5 5 6