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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 18,037 $ 13,955 $ 18,327 $ 15,160
Interest Income Recognized, Total 153 132 522 149
Cash Basis Interest Recognized, Total 153 132 522 149
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 1,190 2,340 1,413 2,859
Average Recorded Investment, No Related Allowance 2,142 2,148 1,927 2,420
Interest Income Recognized, Related Allowance 20 34 56 36
Interest Income Recognized, No Related Allowance 23 24 73 26
Cash Basis Interest Recognized, Related Allowance 20 34 56 36
Cash Basis Interest Recognized, No Related Allowance 23 24 73 26
Commercial Mortgages [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 9,724 7,253 12,497 6,331
Average Recorded Investment, No Related Allowance 4,981 2,214 2,490 3,467
Interest Income Recognized, Related Allowance 77 57 293 61
Interest Income Recognized, No Related Allowance 33 17 100 20
Cash Basis Interest Recognized, Related Allowance 77 57 293 61
Cash Basis Interest Recognized, No Related Allowance 33 17 100 20
Residential Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 0 0 0 83
Average Recorded Investment, No Related Allowance 0 0 0 0
Interest Income Recognized, Related Allowance 0 0 0 6
Interest Income Recognized, No Related Allowance 0 0 0 0
Cash Basis Interest Recognized, Related Allowance 0 0 0 6
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 0 $ 0 $ 0