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LOANS - Nonaccrual, Restructured and Impaired Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance $ 25,919    
Financing Receivable, Nonaccrual, No Allowance 54,833    
Nonaccrual loans 80,752 $ 48,165 $ 70,700
Restructured loans - accrual status 7,100 11,400 16,100
Total nonpeforming loans   59,600  
Interest income effect      
Gross amount of interest that would have been recorded under original terms 5,892 5,813 4,656
Interest included in income      
Nonaccrual loans 1,636 1,042 715
Restructured loans 426 801 642
Impaired Financing Receivable, Interest Income, Accrual Method 2,062 1,843 1,357
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 3,830 3,970 3,299
Loans and Leases Receivable-Nonaccrual, future commitment to lend 0 3 200
Restructured loans - nonaccrual status 14,700 18,500 22,400
Commercial & industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 18,711    
Financing Receivable, Nonaccrual, No Allowance 10,519    
Nonaccrual loans 29,230 24,346 30,925
Total nonpeforming loans   27,480  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   1,013 404
Lease financing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 0    
Financing Receivable, Nonaccrual, No Allowance 0    
Nonaccrual loans 0 223 22
Total nonpeforming loans   223  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   0 0
Construction real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 0    
Financing Receivable, Nonaccrual, No Allowance 0    
Nonaccrual loans 0 0 9
Total nonpeforming loans   0  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   0 2
Commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 6,957    
Financing Receivable, Nonaccrual, No Allowance 27,725    
Nonaccrual loans 34,682 7,295 20,500
Total nonpeforming loans   10,831  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   388 508
Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 251    
Financing Receivable, Nonaccrual, No Allowance 11,350    
Nonaccrual loans 11,601 10,892 13,495
Total nonpeforming loans   15,162  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   319 324
Home equity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 0    
Financing Receivable, Nonaccrual, No Allowance 5,076    
Nonaccrual loans 5,076 5,242 5,580
Total nonpeforming loans   5,700  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   121 117
Installment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Nonaccrual, With Allowance 0    
Financing Receivable, Nonaccrual, No Allowance 163    
Nonaccrual loans $ 163 167 169
Total nonpeforming loans   204  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method   $ 2 $ 2