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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | $ 16,330 |  |  |  | $ 16,737 | $ 16,330 | $ 16,737 | $ 17,373
Charge-offs |  |  |  |  |  |  |  |  | (4,077) | (4,961) | (3,718)
Recoveries |  |  |  |  |  |  |  |  | 785 | 405 | 522
Provision for loan losses | $ 3,105 | $ 1,400 | $ 1,134 | 1,016 | $ 2,111 | $ 622 | $ 220 | 1,196 | 6,655 | 4,149 | 2,560
Allowance for loan losses, Ending Balance | 19,693 |  |  |  | 16,330 |  |  |  | 19,693 | 16,330 | 16,737
Commercial, Industrial, and Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | 5,428 |  |  |  | 6,035 | 5,428 | 6,035 | 7,114
Charge-offs |  |  |  |  |  |  |  |  | (544) | (601) | (307)
Recoveries |  |  |  |  |  |  |  |  | 235 | 89 | 267
Provision for loan losses |  |  |  |  |  |  |  |  | 1,041 | (95) | (1,039)
Allowance for loan losses, Ending Balance | 6,160 |  |  |  | 5,428 |  |  |  | 6,160 | 5,428 | 6,035
Commercial Mortgages [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | 6,753 |  |  |  | 5,605 | 6,753 | 5,605 | 5,310
Charge-offs |  |  |  |  |  |  |  |  | (116) | (201) | (486)
Recoveries |  |  |  |  |  |  |  |  | 197 | 8 | 52
Provision for loan losses |  |  |  |  |  |  |  |  | 2,173 | 1,341 | 729
Allowance for loan losses, Ending Balance | 9,007 |  |  |  | 6,753 |  |  |  | 9,007 | 6,753 | 5,605
Residential Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | 1,653 |  |  |  | 2,475 | 1,653 | 2,475 | 2,479
Charge-offs |  |  |  |  |  |  |  |  | (466) | (499) | (632)
Recoveries |  |  |  |  |  |  |  |  | 78 | 93 | 8
Provision for loan losses |  |  |  |  |  |  |  |  | 768 | (416) | 620
Allowance for loan losses, Ending Balance | 2,033 |  |  |  | 1,653 |  |  |  | 2,033 | 1,653 | 2,475
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | 2,215 |  |  |  | 2,371 | 2,215 | 2,371 | 2,205
Charge-offs |  |  |  |  |  |  |  |  | (2,555) | (3,324) | (1,956)
Recoveries |  |  |  |  |  |  |  |  | 161 | 122 | 96
Provision for loan losses |  |  |  |  |  |  |  |  | 2,358 | 3,046 | 2,026
Allowance for loan losses, Ending Balance | 2,179 |  |  |  | 2,215 |  |  |  | 2,179 | 2,215 | 2,371
Credit Cards [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | 93 |  |  |  | 90 | 93 | 90 | 71
Charge-offs |  |  |  |  |  |  |  |  | (144) | (96) | (116)
Recoveries |  |  |  |  |  |  |  |  | 27 | 22 | 14
Provision for loan losses |  |  |  |  |  |  |  |  | 144 | 77 | 121
Allowance for loan losses, Ending Balance | 120 |  |  |  | 93 |  |  |  | 120 | 93 | 90
Overdrafts [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses, Beginning Balance |  |  |  | $ 188 |  |  |  | $ 161 | 188 | 161 | 194
Charge-offs |  |  |  |  |  |  |  |  | (252) | (240) | (221)
Recoveries |  |  |  |  |  |  |  |  | 87 | 71 | 85
Provision for loan losses |  |  |  |  |  |  |  |  | 171 | 196 | 103
Allowance for loan losses, Ending Balance | $ 194 |  |  |  | $ 188 |  |  |  | $ 194 | $ 188 | $ 161

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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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