LOANS AND ALLOWANCE FOR CREDIT LOSSES - Components of Troubled Debt Restructured Loans and Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	$ 25,410	$ 21,837
NTM Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	2,620	2,932
Traditional Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	22,790	18,905
Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	20,355	16,245
Commercial | SBA
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	266	266
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	0	0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	20,355	16,245
Commercial | Traditional Loans | SBA
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	266	266
Consumer | Single family residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	4,789	5,032
Consumer | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	0	294
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	2,620	2,638
Consumer | NTM Loans | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	0	294
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	2,169	2,394
Consumer | Traditional Loans | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loans and leases	$ 0	$ 0