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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 13,955 $ 20,542 $ 15,160 $ 21,045
Interest Income Recognized, Total 132 5 149 76
Cash Basis Interest Recognized, Total 132 5 149 76
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 2,340 6,463 2,859 6,129
Interest Income Recognized, Related Allowance 34 0 36 42
Cash Basis Interest Recognized, Related Allowance 34 0 36 42
Average Recorded Investment, No Related Allowance 2,148 1,549 2,420 1,496
Interest Income Recognized, No Related Allowance 24 0 26 10
Cash Basis Interest Recognized, No Related Allowance 24 0 26 10
Commercial Mortgages [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 7,253 7,474 6,331 8,069
Interest Income Recognized, Related Allowance 57 0 61 0
Cash Basis Interest Recognized, Related Allowance 57 0 61 0
Average Recorded Investment, No Related Allowance 2,214 4,656 3,467 4,822
Interest Income Recognized, No Related Allowance 17 0 20 0
Cash Basis Interest Recognized, No Related Allowance 17 0 20 0
Residential Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 0 400 83 400
Interest Income Recognized, Related Allowance 0 5 6 18
Cash Basis Interest Recognized, Related Allowance 0 5 6 18
Average Recorded Investment, No Related Allowance 0 0 0 129
Interest Income Recognized, No Related Allowance 0 0 0 6
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 0 $ 0 $ 6