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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Total | $ 19,491 | $ 18,618
Interest Income Recognized, Total | 99 | 179
Cash Basis Interest Recognized, Total | 99 | 179
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 1,884 | 1,636
Interest Income Recognized, Related Allowance | 22 | 18
Cash Basis Interest Recognized, Related Allowance | 22 | 18
Average Recorded Investment, No Related Allowance | 4,600 | 1,712
Interest Income Recognized, No Related Allowance | 46 | 16
Cash Basis Interest Recognized, No Related Allowance | 46 | 16
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 9,234 | 15,270
Interest Income Recognized, Related Allowance | 18 | 145
Cash Basis Interest Recognized, Related Allowance | 18 | 145
Average Recorded Investment, No Related Allowance | 3,753 | 0
Interest Income Recognized, No Related Allowance | 13 | 0
Cash Basis Interest Recognized, No Related Allowance | 13 | 0
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 0 | 0
Interest Income Recognized, Related Allowance | 0 | 0
Cash Basis Interest Recognized, Related Allowance | 0 | 0
Average Recorded Investment, No Related Allowance | 0 | 0
Interest Income Recognized, No Related Allowance | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 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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