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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Total $ 20,931 $ 19,157 $ 22,757
Interest Income Recognized, Total 85 329 17
Cash Basis Interest Recognized, Total 85 329 17
Commercial, Industrial, and Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 5,667 4,621 1,989
Interest Income Recognized, Related Allowance 44 73 7
Cash Basis Interest Recognized, Related Allowance 44 73 7
Average Recorded Investment, No Related Allowance 1,831 1,972 2,124
Interest Income Recognized, No Related Allowance 14 31 0
Cash Basis Interest Recognized, No Related Allowance 14 31 0
Commercial Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 8,154 6,374 6,572
Interest Income Recognized, Related Allowance 0 85 3
Cash Basis Interest Recognized, Related Allowance 0 85 3
Average Recorded Investment, No Related Allowance 4,806 5,868 11,885
Interest Income Recognized, No Related Allowance 0 78 0
Cash Basis Interest Recognized, No Related Allowance 0 78 0
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment, Related Allowance 370 240 101
Interest Income Recognized, Related Allowance 21 46 7
Cash Basis Interest Recognized, Related Allowance 21 46 7
Average Recorded Investment, No Related Allowance 103 82 86
Interest Income Recognized, No Related Allowance 6 16 0
Cash Basis Interest Recognized, No Related Allowance $ 6 $ 16 $ 0