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LOANS - Nonaccrual, Restructured and Impaired Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans $ 48,165 $ 70,700 $ 24,082
Restructured loans - accrual status 11,435 16,109 17,545
Total impaired loans 59,600 86,809 41,627
Interest income effect      
Gross amount of interest that would have been recorded under original terms 5,813 4,656 3,397
Interest included in income      
Nonaccrual loans 1,042 715 535
Restructured loans 801 642 710
Impaired Financing Receivable, Interest Income, Accrual Method 1,843 1,357 1,245
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 3,970 3,299 2,152
Loans and Leases Receivable-Nonaccrual, future commitment to lend 3 200 0
Restructured loans - nonaccrual status 18,500 22,400 6,400
Commercial & industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 24,346 30,925 5,229
Total impaired loans 27,480 37,633  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 1,013 404 308
Lease financing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 223 22 82
Total impaired loans 223 22  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 0 0 4
Construction real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 0 9 29
Total impaired loans 0 9  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 0 2 1
Commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 7,295 20,500 10,616
Total impaired loans 10,831 25,022  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 388 508 603
Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 10,892 13,495 4,140
Total impaired loans 15,162 17,598  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 319 324 222
Home equity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 5,242 5,580 3,743
Total impaired loans 5,700 6,351  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 121 117 103
Installment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans 167 169 243
Total impaired loans 204 174  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method $ 2 $ 2 $ 4