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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 22,898 $ 18,403 $ 22,702 $ 18,371
Interest Income Recognized, Total 24 4 73 13
Cash Basis Interest Recognized, Total 24 4 73 13
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 6,315 4,318 6,071 4,438
Interest Income Recognized, Related Allowance 7 1 42 2
Cash Basis Interest Recognized, Related Allowance 7 1 42 2
Average Recorded Investment, No Related Allowance 1,689 2,234 1,631 2,167
Interest Income Recognized, No Related Allowance 2 0 12 0
Cash Basis Interest Recognized, No Related Allowance 2 0 12 0
Commercial Mortgages [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 9,646 5,402 9,617 5,416
Interest Income Recognized, Related Allowance 0 0 0 0
Cash Basis Interest Recognized, Related Allowance 0 0 0 0
Average Recorded Investment, No Related Allowance 4,719 6,249 4,854 6,217
Interest Income Recognized, No Related Allowance 0 0 0 0
Cash Basis Interest Recognized, No Related Allowance 0 0 0 0
Residential Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Related Allowance 400 200 400 133
Interest Income Recognized, Related Allowance 11 3 13 11
Cash Basis Interest Recognized, Related Allowance 11 3 13 11
Average Recorded Investment, No Related Allowance 129 0 129 0
Interest Income Recognized, No Related Allowance 4 0 6 0
Cash Basis Interest Recognized, No Related Allowance $ 4 $ 0 $ 6 $ 0