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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Total $ 15,867 $ 20,931 $ 19,157
Interest Income Recognized, Total 8 85 329
Cash Basis Interest Recognized, Total 8 85 329
Commercial, Industrial, and Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 2,616 5,667 4,621
Interest Income Recognized, Related Allowance 2 44 73
Cash Basis Interest Recognized, Related Allowance 2 44 73
Average Recorded Investment, No Related Allowance 2,290 1,831 1,972
Interest Income Recognized, No Related Allowance 0 14 31
Cash Basis Interest Recognized, No Related Allowance 0 14 31
Commercial Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 8,138 8,154 6,374
Interest Income Recognized, Related Allowance 0 0 85
Cash Basis Interest Recognized, Related Allowance 0 0 85
Average Recorded Investment, No Related Allowance 2,773 4,806 5,868
Interest Income Recognized, No Related Allowance 0 0 78
Cash Basis Interest Recognized, No Related Allowance 0 0 78
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 50 370 240
Interest Income Recognized, Related Allowance 6 21 46
Cash Basis Interest Recognized, Related Allowance 6 21 46
Average Recorded Investment, No Related Allowance 0 103 82
Interest Income Recognized, No Related Allowance 0 6 16
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 6 $ 16