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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total $ 18,618 $ 16,322
Interest Income Recognized, Total 179 6
Cash Basis Interest Recognized, Total 179 6
Commercial, Industrial, and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 1,636 3,379
Average Recorded Investment, No Related Allowance 1,712 2,691
Interest Income Recognized, Related Allowance 18 0
Interest Income Recognized, No Related Allowance 16 0
Cash Basis Interest Recognized, Related Allowance 18 0
Cash Basis Interest Recognized, No Related Allowance 16 0
Commercial Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 15,270 5,408
Average Recorded Investment, No Related Allowance 0 4,720
Interest Income Recognized, Related Allowance 145 0
Interest Income Recognized, No Related Allowance 0 0
Cash Basis Interest Recognized, Related Allowance 145 0
Cash Basis Interest Recognized, No Related Allowance 0 0
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 0 124
Average Recorded Investment, No Related Allowance 0 0
Interest Income Recognized, Related Allowance 0 5
Interest Income Recognized, No Related Allowance 0 1
Cash Basis Interest Recognized, Related Allowance 0 5
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 1