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LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Detail)
 9 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
note
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 1,979,690,000 $ 1,979,986,000    
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)   85.00%    
Number of PPP loans | loan   3,300    
SBA, loan guarantee, percentage   100.00%    
Risk review of commercial relationships with committed loan balance amount (exceeds)   $ 1,000,000    
Amount of loans reviewed that require approval   $ 500,000    
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%    
Reserve 20,151,000 $ 21,180,000 $ 14,655,000 $ 14,014,000
Commercial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Reserve 16,247,000 17,943,000 11,049,000 9,447,000
Consumer        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Reserve 3,686,000 3,000,000 3,466,000 3,997,000
Commercial and industrial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 647,368,000 485,728,000    
Commercial and industrial | Commercial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Reserve 3,942,000 3,814,000 2,356,000 1,656,000
Commercial Real Estate | Commercial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Reserve $ 11,151,000 12,037,000 $ 7,634,000 $ 6,876,000
Commercial Portfolio        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Decrease in reserve   2,700,000    
Reserve   0    
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 $ 0    
Number of PPP loans | loan 3,200 6,500    
PPP loans generated amount $ 467,700,000 $ 231,700,000    
PPP Loan processing fee income 13,500,000      
Loan deferral period   180 days    
SBA | Commercial | Payment Deferral | Maximum        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PPP loans generated amount   $ 699,400,000    
SBA | Commercial | 2021 Payment Deferrals        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PPP Loan processing fee income   12,300,000    
SBA | Commercial | 2021 Remaining Payment Deferrals        
Financing Receivable, Allowance for Credit Losses [Line Items]        
PPP Loan processing fee income   5,500,000    
SBA | Consumer | Payment Deferral        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 2,500,000 $ 56,000    
Loan deferral period   90 days    
SBA | Commercial and industrial | SBA PPP Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 403,300,000 $ 189,900,000