LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Amortized Cost Basis of Collateral-dependent Loans (Details) - Collateral Dependent Loans $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 10,426
Allowance for Credit Losses Allocation	1,900
Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	10,426
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	134
Allowance for Credit Losses Allocation	37
Commercial and industrial | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	134
Construction and development
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	600
Allowance for Credit Losses Allocation	175
Construction and development | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	600
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	9,692
Allowance for Credit Losses Allocation	1,688
Commercial real estate | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 9,692