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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 20,542 $ 18,310 $ 21,045 $ 18,146
Interest Income Recognized, Total 5 179 76 192
Cash Basis Interest Recognized, Total 5 179 76 192
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 6,463 4,023 6,129 4,342
Interest Income Recognized, Related Allowance 0 62 42 64
Cash Basis Interest Recognized, Related Allowance 0 62 42 64
Average Recorded Investment, No Related Allowance 1,549 2,012 1,496 2,071
Interest Income Recognized, No Related Allowance 0 32 10 32
Cash Basis Interest Recognized, No Related Allowance 0 32 10 32
Commercial Mortgages [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 7,474 5,511 8,069 5,415
Interest Income Recognized, Related Allowance 0 18 0 18
Cash Basis Interest Recognized, Related Allowance 0 18 0 18
Average Recorded Investment, No Related Allowance 4,656 6,288 4,822 6,080
Interest Income Recognized, No Related Allowance 0 22 0 22
Cash Basis Interest Recognized, No Related Allowance 0 22 0 22
Residential Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 400 400 400 200
Interest Income Recognized, Related Allowance 5 45 18 56
Cash Basis Interest Recognized, Related Allowance 5 45 18 56
Average Recorded Investment, No Related Allowance 0 76 129 38
Interest Income Recognized, No Related Allowance 0 0 6 0
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 0 $ 6 $ 0