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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total $ 19,491 $ 18,618
Interest Income Recognized, Total 99 179
Cash Basis Interest Recognized, Total 99 179
Commercial, Industrial, and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 1,884 1,636
Interest Income Recognized, Related Allowance 22 18
Cash Basis Interest Recognized, Related Allowance 22 18
Average Recorded Investment, No Related Allowance 4,600 1,712
Interest Income Recognized, No Related Allowance 46 16
Cash Basis Interest Recognized, No Related Allowance 46 16
Commercial Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 9,234 15,270
Interest Income Recognized, Related Allowance 18 145
Cash Basis Interest Recognized, Related Allowance 18 145
Average Recorded Investment, No Related Allowance 3,753 0
Interest Income Recognized, No Related Allowance 13 0
Cash Basis Interest Recognized, No Related Allowance 13 0
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Related Allowance 0 0
Interest Income Recognized, Related Allowance 0 0
Cash Basis Interest Recognized, Related Allowance 0 0
Average Recorded Investment, No Related Allowance 0 0
Interest Income Recognized, No Related Allowance 0 0
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 0