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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Allowance for credit losses $ 67,300,000          
Troubled Debt Restructurings Internal Grading System Substandard       $ 3,100,000   $ 1,600,000
Financing Receivables, Troubled Debt Restructuring   $ 4,000,000   4,000,000   3,300,000
Impaired Loans For Specific Valuation Allowances           713,000
Impaired Loans           4,800,000
Non-accrual loans for no related allowance amortized cost       3,200,000    
TDR loans evaluated on individual 100,000          
After-tax effect decreased retained earnings 14,200,000          
Troubled Debt Restructurings Returned to Accrual Status   310,000 $ 0 337,000 $ 0  
Loans and Leases Receivable, Allowance   66,602,000   66,602,000   55,743,000
Provision for Loan and Lease Losses   (1,000,000) 6,000,000 (700,000) 9,871,000  
Aggregate Principal balance outstanding 15 modified comercial loans       91,000,000    
Aggregate Principal balance outstanding 30 modified comercial loans       876,000    
Aggregate Principal balance outstanding 65 modified comercial loans           233,000,000
Aggregate Principal balance outstanding 581 modified comercial loans           18,000,000
FDIC-assisted acquired loans class categories       84,400,000    
FDIC-acquired loans and remaining accretable yield   885,000   885,000    
FDIC-assisted acquired loans not loan class categories       98,600,000    
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans       100,000    
Hotel [Member]            
Total modified loans by collateral   29,000,000   29,000,000    
Multifamily [Member]            
Total modified loans by collateral   11,000,000   11,000,000    
Health Care [Member]            
Total modified loans by collateral   18,000,000   18,000,000    
Retail            
Total modified loans by collateral   22,000,000   22,000,000    
Allowance for unfunded commitment            
Allowance for credit losses 8,700,000          
PCI [Member]            
Allowance for credit losses 1,900,000          
Adopted ASC 326 [Member]            
Loans and Leases Receivable, Allowance 11,600,000          
Loans acquired and accounted       84,400,000    
Adopted ASC 310-30 [Member]            
Non-accruing loans acquired       2,400,000   3,800,000
FDIC-acquired Loans Accounted           $ 1,700,000
Loans acquired and accounted       84,400,000    
CECL Methodology [Member]            
Allowance for credit losses 11,600,000          
Allowance for credit loss remaining discount on loan 1,900,000          
Provision for Loan and Lease Losses   (1,000,000) $ 6,000,000 (700,000) $ 9,900,000  
CECL Methodology [Member] | Allowance for unfunded commitment            
Allowance for credit losses $ 8,700,000          
Provision for Loan and Lease Losses   $ 307,000   $ 981,000