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LOANS - Nonaccrual, Restructured and Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans $ 24,082 $ 17,730 $ 27,997
Restructured loans - accrual status 17,500 30,200 28,900
Total impaired loans 41,627 47,970 56,873
Interest income effect      
Gross amount of interest that would have been recorded under original terms 3,397 2,848 3,595
Interest included in income      
Nonaccrual loans 535 375 475
Restructured loans 710 876 682
Impaired Financing Receivable, Interest Income, Accrual Method 1,245 1,251 1,157
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 2,152 1,597 2,438
Loans and Leases Receivable-Nonaccrual, future commitment to lend 0 0 1
Restructured loans - nonaccrual status 6,400 5,100 9,300
Commercial      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 5,229 2,419 8,405
Total impaired loans 7,331 13,203  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 308 346 284
Lease financing      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 82 195 122
Total impaired loans 82 195  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 4 11 0
Construction real estate      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 29 0 0
Total impaired loans 29 0  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 1 0 0
Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 10,616 6,098 9,418
Total impaired loans 21,542 20,460  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 603 568 557
Residential real estate      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 4,140 5,251 5,027
Total impaired loans 7,932 9,601  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 222 229 224
Home equity      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 3,743 3,400 4,898
Total impaired loans 4,456 4,074  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method 103 90 85
Installment      
Financing Receivable, Modifications [Line Items]      
Nonaccrual loans 243 367 127
Total impaired loans 255 437  
Interest included in income      
Impaired Financing Receivable, Interest Income, Accrual Method $ 4 $ 7 $ 7