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LOANS AND ALLOWANCE FOR LOAN LOSSES - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
numberOfLoans
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
note
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans $ 2,041,317,000   $ 2,041,317,000   $ 1,644,330,000
Interest and fee income on loans 21,794,000 $ 19,658,000 41,960,000 $ 34,809,000  
Amount of loan on which review have been made annually 500,000   500,000    
Amount of loan on which reviews require approval 500,000   $ 500,000    
Loans that are deemed impaired, number of days past due (more than)     90 days    
Number of notes split | note     2    
Appraisals, required period interval     18 months    
Minimum amount on which annual updated appraisals for classified loans is required 250,000   $ 250,000    
Commercial and industrial          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 665,312,000   665,312,000   $ 214,554,000
SBA | Consumer | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 21,200,000   $ 21,200,000    
Loan deferral period     90 days    
SBA | Commercial | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans $ 218,100,000   $ 218,100,000    
Number of of PPP loans | numberOfLoans 2,800        
PPP loans generated amount $ 459,600,000   459,600,000    
SBA, loan guarantee, percentage 100.00%        
PPP Loan processing fee income $ 13,200,000        
Interest and fee income on loans $ 1,900,000   $ 1,900,000    
Loan deferral period     180 days    
Minimum | SBA | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Fee income amortization period 2 years        
Maximum          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Percentage of loan-to-value ratio upon loan origination     80.00%    
Percentage of loan-to-value ratios of the value of the real estate taken as collateral     90.00%    
Percentage of strong loan-to-value     70.00%    
Maximum | SBA | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Fee income amortization period 5 years