LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Amortized Cost Basis of Collateral-dependent Loans (Details) - Collateral Dependent Loans $ in Thousands	Mar. 31, 2020 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 10,791
Allowance for Credit Losses Allocation	1,500
Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	10,426
Non-RE
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	365
Commercial and industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	134
Allowance for Credit Losses Allocation	16
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	69
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	1,415
Commercial real estate | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	9,692
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	174
Consumer | Non-RE
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	174
Agricultural
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	191
Agricultural | Non-RE
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 191