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LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Details)
3 Months Ended 9 Months Ended 18 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
loan
note
Dec. 31, 2020
USD ($)
loan
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
loan
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Loans, net $ 1,939,764,000   $ 1,939,764,000 $ 1,979,690,000   $ 1,939,764,000      
Number of PPP loans | loan     3,300 3,200          
Interest and fee income on loans (19,890,000) $ (21,645,000) $ (62,724,000)   $ (63,605,000)        
SBA, loan guarantee, percentage     100.00%            
Amount of loan on which review have been made annually 1,000,000   $ 1,000,000     1,000,000      
Amount of loan on which reviews require approval 500,000   $ 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     250,000      
Allowance for loan losses 19,965,000 19,725,000 19,965,000 $ 20,151,000 19,725,000 19,965,000 $ 19,381,000 $ 17,517,000 $ 14,655,000
Commercial                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Allowance for loan losses 16,806,000 15,672,000 16,806,000 16,247,000 15,672,000 16,806,000 16,082,000 13,407,000 11,049,000
Consumer                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Allowance for loan losses 2,951,000 3,873,000 $ 2,951,000 3,686,000 3,873,000 2,951,000 3,090,000 3,938,000 3,466,000
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 (or lower)     70.00%            
Commercial and industrial                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Loans, net 540,205,000   $ 540,205,000 647,368,000   540,205,000      
Commercial and industrial | Commercial                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Allowance for loan losses 3,886,000 $ 3,731,000 3,886,000 3,942,000 $ 3,731,000 3,886,000 $ 3,495,000 $ 2,916,000 $ 2,356,000
Commercial real estate                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Decrease in reserve 1,000,000   2,700,000            
Allowance for loan losses 0   0     0      
SBA | Commercial | Payment Deferral                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Loans, net 0   0 15,700,000   $ 0      
Number of PPP loans | loan           6,500      
PPP loans generated amount 231,700,000   231,700,000 467,700,000   $ 231,700,000      
PPP Loan processing fee income       13,500,000          
Interest and fee income on loans     $ (8,600,000)            
Loan deferral period     180 days            
SBA | Commercial | 2021 Payment Deferrals                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
PPP Loan processing fee income     $ 12,300,000            
SBA | Consumer | Payment Deferral                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Loans, net 317,000   $ 317,000 $ 2,500,000   317,000      
Loan deferral period     90 days            
SBA | Maximum | Payment Deferral                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Fee income amortization period       5 years          
SBA | Maximum | Commercial | Payment Deferral                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
PPP loans generated amount 699,400,000   $ 699,400,000     699,400,000      
SBA | Minimum | Payment Deferral                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Fee income amortization period       2 years          
SBA | Commercial and industrial | SBA PPP Loans                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Loans, net $ 259,900,000   $ 259,900,000 $ 403,300,000   $ 259,900,000