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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 13,955 | $ 20,542 | $ 15,160 | $ 21,045
Interest Income Recognized, Total | 132 | 5 | 149 | 76
Cash Basis Interest Recognized, Total | 132 | 5 | 149 | 76
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 2,340 | 6,463 | 2,859 | 6,129
Interest Income Recognized, Related Allowance | 34 | 0 | 36 | 42
Cash Basis Interest Recognized, Related Allowance | 34 | 0 | 36 | 42
Average Recorded Investment, No Related Allowance | 2,148 | 1,549 | 2,420 | 1,496
Interest Income Recognized, No Related Allowance | 24 | 0 | 26 | 10
Cash Basis Interest Recognized, No Related Allowance | 24 | 0 | 26 | 10
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 7,253 | 7,474 | 6,331 | 8,069
Interest Income Recognized, Related Allowance | 57 | 0 | 61 | 0
Cash Basis Interest Recognized, Related Allowance | 57 | 0 | 61 | 0
Average Recorded Investment, No Related Allowance | 2,214 | 4,656 | 3,467 | 4,822
Interest Income Recognized, No Related Allowance | 17 | 0 | 20 | 0
Cash Basis Interest Recognized, No Related Allowance | 17 | 0 | 20 | 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 | 5 | 6 | 18
Cash Basis Interest Recognized, Related Allowance | 0 | 5 | 6 | 18
Average Recorded Investment, No Related Allowance | 0 | 0 | 0 | 129
Interest Income Recognized, No Related Allowance | 0 | 0 | 0 | 6
Cash Basis Interest Recognized, No Related Allowance | $ 0 | $ 0 | $ 0 | $ 6

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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