LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Troubled Debt Restructuring [Abstract]
Number of Loans | contract	8	18	22
Total modifications	$ 521	$ 8,955	$ 11,269
Extend Amortization Period
Troubled Debt Restructuring [Abstract]
Total modifications	51	7,574	10,617
Interest Rate Reductions
Troubled Debt Restructuring [Abstract]
Total modifications	0	0	112
Combination
Troubled Debt Restructuring [Abstract]
Total modifications	$ 470	$ 1,381	$ 540
1-4 family residential real estate loans
Troubled Debt Restructuring [Abstract]
Number of Loans | contract		2	1
Total modifications		$ 121	$ 79
1-4 family residential real estate loans | Extend Amortization Period
Troubled Debt Restructuring [Abstract]
Total modifications		0	0
1-4 family residential real estate loans | Interest Rate Reductions
Troubled Debt Restructuring [Abstract]
Total modifications		0	79
1-4 family residential real estate loans | Combination
Troubled Debt Restructuring [Abstract]
Total modifications		$ 121	$ 0
Commercial real estate loans
Troubled Debt Restructuring [Abstract]
Number of Loans | contract	1	2	3
Total modifications	$ 58	$ 7,611	$ 10,672
Commercial real estate loans | Extend Amortization Period
Troubled Debt Restructuring [Abstract]
Total modifications	0	7,518	10,398
Commercial real estate loans | Interest Rate Reductions
Troubled Debt Restructuring [Abstract]
Total modifications	0	0	0
Commercial real estate loans | Combination
Troubled Debt Restructuring [Abstract]
Total modifications	$ 58	$ 93	$ 274
Commercial loans
Troubled Debt Restructuring [Abstract]
Number of Loans | contract	6	9	13
Total modifications	$ 441	$ 1,195	$ 426
Commercial loans | Extend Amortization Period
Troubled Debt Restructuring [Abstract]
Total modifications	51	52	211
Commercial loans | Interest Rate Reductions
Troubled Debt Restructuring [Abstract]
Total modifications	0	0	0
Commercial loans | Combination
Troubled Debt Restructuring [Abstract]
Total modifications	$ 390	$ 1,143	$ 215
Loans to individuals
Troubled Debt Restructuring [Abstract]
Number of Loans | contract	1	5	5
Total modifications	$ 22	$ 28	$ 92
Loans to individuals | Extend Amortization Period
Troubled Debt Restructuring [Abstract]
Total modifications	0	4	8
Loans to individuals | Interest Rate Reductions
Troubled Debt Restructuring [Abstract]
Total modifications	0	0	33
Loans to individuals | Combination
Troubled Debt Restructuring [Abstract]
Total modifications	$ 22	$ 24	$ 51