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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 15,442 $ 22,898 $ 15,886 $ 22,702
Interest Income Recognized, Total 11 24 17 73
Cash Basis Interest Recognized, Total 11 24 17 73
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 3,150 6,315 3,249 6,071
Interest Income Recognized, Related Allowance 2 7 2 42
Cash Basis Interest Recognized, Related Allowance 2 7 2 42
Average Recorded Investment, No Related Allowance 2,525 1,689 2,612 1,631
Interest Income Recognized, No Related Allowance 2 2 2 12
Cash Basis Interest Recognized, No Related Allowance 2 2 2 12
Commercial Mortgages [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 5,309 9,646 5,320 9,617
Interest Income Recognized, Related Allowance 4 0 4 0
Cash Basis Interest Recognized, Related Allowance 4 0 4 0
Average Recorded Investment, No Related Allowance 4,458 4,719 4,622 4,854
Interest Income Recognized, No Related Allowance 3 0 3 0
Cash Basis Interest Recognized, No Related Allowance 3 0 3 0
Residential Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 0 400 83 400
Interest Income Recognized, Related Allowance 0 11 6 13
Cash Basis Interest Recognized, Related Allowance 0 11 6 13
Average Recorded Investment, No Related Allowance 0 129 0 129
Interest Income Recognized, No Related Allowance 0 4 0 6
Cash Basis Interest Recognized, No Related Allowance $ 0 $ 4 $ 0 $ 6