LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of TDR Modification Type (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				12
Post-Modification Outstanding Recorded Investment | $				$ 17,889
Change in Principal Payments and Interest Rates
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				12
Post-Modification Outstanding Recorded Investment | $				$ 17,889
Change in Principal Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				0
Post-Modification Outstanding Recorded Investment | $				$ 0
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	1	12
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 5,000	$ 17,889
Commercial | Change in Principal Payments and Interest Rates
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	1
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 5,000
Commercial | Change in Principal Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	1	10
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 5,000	$ 17,020
Commercial | Commercial and industrial | Change in Principal Payments and Interest Rates
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1	10
Post-Modification Outstanding Recorded Investment | $			$ 5,000	$ 17,020
Commercial | Commercial and industrial | Change in Principal Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			0	0
Post-Modification Outstanding Recorded Investment | $			$ 0	$ 0
Commercial | SBA
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0		2
Post-Modification Outstanding Recorded Investment | $		$ 0		$ 869
Commercial | SBA | Change in Principal Payments and Interest Rates
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				2
Post-Modification Outstanding Recorded Investment | $				$ 869
Commercial | SBA | Change in Principal Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				0
Post-Modification Outstanding Recorded Investment | $				$ 0