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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total $ 16,322 $ 23,401
Interest Income Recognized, Total 6 49
Cash Basis Interest Recognized, Total 6 49
Commercial, Industrial, and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 3,379 5,981
Interest Income Recognized, Related Allowance 0 35
Cash Basis Interest Recognized, Related Allowance 0 35
Average Recorded Investment, No Related Allowance 2,691 1,636
Interest Income Recognized, No Related Allowance 0 10
Cash Basis Interest Recognized, No Related Allowance 0 10
Commercial Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 5,408 10,241
Interest Income Recognized, Related Allowance 0 0
Cash Basis Interest Recognized, Related Allowance 0 0
Average Recorded Investment, No Related Allowance 4,720 4,886
Interest Income Recognized, No Related Allowance 0 0
Cash Basis Interest Recognized, No Related Allowance 0 0
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 124 400
Interest Income Recognized, Related Allowance 5 2
Cash Basis Interest Recognized, Related Allowance 5 2
Average Recorded Investment, No Related Allowance 0 257
Interest Income Recognized, No Related Allowance 1 2
Cash Basis Interest Recognized, No Related Allowance $ 1 $ 2