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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, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Total | $ 20,513 | $ 18,501
Recorded Investment, Total | 18,782 | 16,778
Allowance for Loan Losses Allocated | 3,523 | 3,190
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 1,644 | 3,448
Recorded Investment, Related Allowance | 1,644 | 3,448
Allowance for Loan Losses Allocated | 313 | 1,126
Unpaid Principal Balance, No Related Allowance | 2,669 | 3,716
Recorded Investment, No Related Allowance | 1,771 | 2,788
Allowance for Loan Losses Allocated, No Related Allowance | 0 | 0
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 16,200 | 5,985
Recorded Investment, Related Allowance | 15,367 | 5,343
Allowance for Loan Losses Allocated | 3,210 | 2,025
Unpaid Principal Balance, No Related Allowance | 0 | 5,001
Recorded Investment, No Related Allowance | 0 | 4,951
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 | 351
Recorded Investment, Related Allowance | 0 | 248
Allowance for Loan Losses Allocated | 0 | 39
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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