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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 18,183 | $ 18,382 | $ 15,442 | $ 15,886
Interest Income Recognized, Total | 190 | 369 | 11 | 17
Cash Basis Interest Recognized, Total | 190 | 369 | 11 | 17
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 1,398 | 1,480 | 3,150 | 3,249
Average Recorded Investment, No Related Allowance | 1,833 | 1,812 | 2,525 | 2,612
Interest Income Recognized, Related Allowance | 18 | 36 | 2 | 2
Interest Income Recognized, No Related Allowance | 34 | 50 | 2 | 2
Cash Basis Interest Recognized, Related Allowance | 18 | 36 | 2 | 2
Cash Basis Interest Recognized, No Related Allowance | 34 | 50 | 2 | 2
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 12,505 | 13,459 | 5,309 | 5,320
Average Recorded Investment, No Related Allowance | 2,447 | 1,631 | 4,458 | 4,622
Interest Income Recognized, Related Allowance | 71 | 216 | 4 | 4
Interest Income Recognized, No Related Allowance | 67 | 67 | 3 | 3
Cash Basis Interest Recognized, Related Allowance | 71 | 216 | 4 | 4
Cash Basis Interest Recognized, No Related Allowance | 67 | 67 | 3 | 3
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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