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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 20,542 | $ 18,310 | $ 21,045 | $ 18,146
Interest Income Recognized, Total | 5 | 179 | 76 | 192
Cash Basis Interest Recognized, Total | 5 | 179 | 76 | 192
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 6,463 | 4,023 | 6,129 | 4,342
Interest Income Recognized, Related Allowance | 0 | 62 | 42 | 64
Cash Basis Interest Recognized, Related Allowance | 0 | 62 | 42 | 64
Average Recorded Investment, No Related Allowance | 1,549 | 2,012 | 1,496 | 2,071
Interest Income Recognized, No Related Allowance | 0 | 32 | 10 | 32
Cash Basis Interest Recognized, No Related Allowance | 0 | 32 | 10 | 32
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 7,474 | 5,511 | 8,069 | 5,415
Interest Income Recognized, Related Allowance | 0 | 18 | 0 | 18
Cash Basis Interest Recognized, Related Allowance | 0 | 18 | 0 | 18
Average Recorded Investment, No Related Allowance | 4,656 | 6,288 | 4,822 | 6,080
Interest Income Recognized, No Related Allowance | 0 | 22 | 0 | 22
Cash Basis Interest Recognized, No Related Allowance | 0 | 22 | 0 | 22
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 400 | 400 | 400 | 200
Interest Income Recognized, Related Allowance | 5 | 45 | 18 | 56
Cash Basis Interest Recognized, Related Allowance | 5 | 45 | 18 | 56
Average Recorded Investment, No Related Allowance | 0 | 76 | 129 | 38
Interest Income Recognized, No Related Allowance | 0 | 0 | 6 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 0 | $ 0 | $ 6 | $ 0

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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=49124121&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=49124121&loc=d3e5258-111524 + Details
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