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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

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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=84173941&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=84173941&loc=d3e5258-111524 + Details
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