LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Amortized Cost Basis of Collateral-dependent Loans (Details) - Collateral Dependent Loans $ in Thousands	Sep. 30, 2020 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 10,725
Allowance for Credit Losses Allocation	2,201
Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	10,725
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	129
Allowance for Credit Losses Allocation	37
Commercial and industrial | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	129
Construction and development
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	609
Allowance for Credit Losses Allocation	174
Construction and development | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	609
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	9,987
Allowance for Credit Losses Allocation	1,990
Commercial real estate | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 9,987