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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total | $ 18,369 | $ 15,867 | $ 20,931
Interest Income Recognized, Total | 660 | 8 | 85
Cash Basis Interest Recognized, Total | 660 | 8 | 85
Commercial, Industrial, and Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 1,513 | 2,616 | 5,667
Interest Income Recognized, Related Allowance | 97 | 2 | 44
Cash Basis Interest Recognized, Related Allowance | 97 | 2 | 44
Average Recorded Investment, No Related Allowance | 2,438 | 2,290 | 1,831
Interest Income Recognized, No Related Allowance | 114 | 0 | 14
Cash Basis Interest Recognized, No Related Allowance | 114 | 0 | 14
Commercial Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 11,944 | 8,138 | 8,154
Interest Income Recognized, Related Allowance | 327 | 0 | 0
Cash Basis Interest Recognized, Related Allowance | 327 | 0 | 0
Average Recorded Investment, No Related Allowance | 2,474 | 2,773 | 4,806
Interest Income Recognized, No Related Allowance | 122 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 122 | 0 | 0
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 0 | 50 | 370
Interest Income Recognized, Related Allowance | 0 | 6 | 21
Cash Basis Interest Recognized, Related Allowance | 0 | 6 | 21
Average Recorded Investment, No Related Allowance | 0 | 0 | 103
Interest Income Recognized, No Related Allowance | 0 | 0 | 6
Cash Basis Interest Recognized, No Related Allowance | $ 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=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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