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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Total $ 18,369 $ 15,867 $ 20,931
Interest Income Recognized, Total 660 8 85
Cash Basis Interest Recognized, Total 660 8 85
Commercial, Industrial, and Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 1,513 2,616 5,667
Interest Income Recognized, Related Allowance 97 2 44
Cash Basis Interest Recognized, Related Allowance 97 2 44
Average Recorded Investment, No Related Allowance 2,438 2,290 1,831
Interest Income Recognized, No Related Allowance 114 0 14
Cash Basis Interest Recognized, No Related Allowance 114 0 14
Commercial Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 11,944 8,138 8,154
Interest Income Recognized, Related Allowance 327 0 0
Cash Basis Interest Recognized, Related Allowance 327 0 0
Average Recorded Investment, No Related Allowance 2,474 2,773 4,806
Interest Income Recognized, No Related Allowance 122 0 0
Cash Basis Interest Recognized, No Related Allowance 122 0 0
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 0 50 370
Interest Income Recognized, Related Allowance 0 6 21
Cash Basis Interest Recognized, Related Allowance 0 6 21
Average Recorded Investment, No Related Allowance 0 0 103
Interest Income Recognized, No Related Allowance 0 0 6
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 0 $ 6