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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | $ 19,693 | $ 16,330
Charge-offs | (726) | (931)
Recoveries | 158 | 131
Provision (benefit) for loan losses | 1,631 | 1,016
Allowance for loan losses, Ending Balance | 20,756 | 16,546
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | 6,160 | 5,428
Charge-offs | (31) | (1)
Recoveries | 68 | 12
Provision (benefit) for loan losses | 85 | (654)
Allowance for loan losses, Ending Balance | 6,282 | 4,785
Commercial Mortgages [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | 9,007 | 6,753
Charge-offs | 0 | 0
Recoveries | 0 | 2
Provision (benefit) for loan losses | 1,013 | 602
Allowance for loan losses, Ending Balance | 10,020 | 7,357
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | 2,033 | 1,653
Charge-offs | 0 | (68)
Recoveries | 3 | 71
Provision (benefit) for loan losses | 16 | 366
Allowance for loan losses, Ending Balance | 2,052 | 2,022
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | 2,179 | 2,215
Charge-offs | (590) | (735)
Recoveries | 49 | 2
Provision (benefit) for loan losses | 427 | 607
Allowance for loan losses, Ending Balance | 2,065 | 2,089
Credit Cards [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | 120 | 93
Charge-offs | (19) | (58)
Recoveries | 7 | 11
Provision (benefit) for loan losses | 15 | 59
Allowance for loan losses, Ending Balance | 123 | 105
Overdrafts [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, Beginning Balance | 194 | 188
Charge-offs | (86) | (69)
Recoveries | 31 | 33
Provision (benefit) for loan losses | 75 | 36
Allowance for loan losses, Ending Balance | $ 214 | $ 188

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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