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LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Detail)
12 Months Ended
Dec. 31, 2020
USD ($)
loan
note
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 1,979,690,000 $ 1,644,330,000  
Maximum percentage of loan-to-value ratio upon loan origination (no more than) 80.00%    
Maximum percentage of loan-to-value ratios of the value of the real estate taken as collateral (no greater than) 90.00%    
Interest income $ 87,492,000 75,071,000 $ 50,632,000
Period past due when loans are deemed impaired 90 days    
Number of notes split | note 2    
Appraisals, required period interval 18 months    
Minimum amount on which annual updated appraisals for criticized loans are required $ 250,000    
Percentage of strong loan-to-value 70.00%    
Commercial and industrial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 647,368,000 214,554,000  
Commercial Real Estate | Owner-occupied      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 174,908,000 170,884,000  
SBA | Payment Deferral | Minimum      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Fee income amortization period 2 years    
SBA | Payment Deferral | Maximum      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Fee income amortization period 5 years    
SBA | Commercial | Payment Deferral      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 15,700,000    
Number of PPP loans | loan 2,700    
PPP loans generated amount $ 409,100,000    
SBA, loan guarantee, percentage 100.00%    
PPP Loan processing fee income $ 13,500,000    
Interest income $ 7,700,000    
Loan deferral period 180 days    
SBA | Consumer | Payment Deferral      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 2,500,000    
Loan deferral period 90 days    
SBA | Commercial and industrial | SBA PPP Loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans $ 403,300,000 $ 0  
Unrecognized deferred fees $ 5,800,000