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LOANS AND ALLOWANCE FOR LOAN LOSSES - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
numberOfLoans
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
note
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans $ 2,029,870,000   $ 2,029,870,000   $ 1,644,330,000
Interest and fee income on loans 21,645,000 $ 20,178,000 63,605,000 $ 54,987,000  
Amount of loan on which review have been made annually 1,000,000.0   1,000,000.0    
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 690,330,000   690,330,000   214,554,000
SBA | Commercial | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans $ 61,600,000   61,600,000    
Number of of PPP loans | numberOfLoans 3,200        
PPP loans generated amount $ 467,700,000   467,700,000    
SBA, loan guarantee, percentage 100.00%        
PPP Loan processing fee income $ 13,500,000        
Interest and fee income on loans 2,200,000   $ 4,000,000.0    
Loan deferral period     180 days    
SBA | Consumer | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 16,800,000   $ 16,800,000    
Loan deferral period     90 days    
SBA | Commercial and industrial | SBA PPP Loans          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans 458,100,000   $ 458,100,000   $ 0
Unrecognized deferred fees $ 9,500,000   $ 9,500,000    
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        
Minimum | SBA | Payment Deferral          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Fee income amortization period 2 years