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Loans - Loans Individually Evaluated for Impairment Including Loans Modified in Troubled Debt Restructurings by Portfolio Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Total | $ 20,330 | $ 20,513
Recorded Investment, Total | 18,541 | 18,782
Allowance for Loan Losses Allocated | 5,736 | 3,523
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 1,915 | 1,644
Recorded Investment, Related Allowance | 1,915 | 1,644
Allowance for Loan Losses Allocated | 292 | 313
Unpaid Principal Balance, No Related Allowance | 5,264 | 2,669
Recorded Investment, No Related Allowance | 4,485 | 1,771
Allowance for Loan Losses Allocated, No Related Allowance | 0 | 0
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 9,940 | 16,200
Recorded Investment, Related Allowance | 9,731 | 15,367
Allowance for Loan Losses Allocated | 5,444 | 3,210
Unpaid Principal Balance, No Related Allowance | 3,211 | 0
Recorded Investment, No Related Allowance | 2,410 | 0
Allowance for Loan Losses Allocated, No Related Allowance | 0 | 0
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 0 | 0
Recorded Investment, Related Allowance | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Unpaid Principal Balance, No Related Allowance | 0 | 0
Recorded Investment, No Related Allowance | 0 | 0
Allowance for Loan Losses Allocated, No Related Allowance | $ 0 | $ 0

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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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