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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | $ 16,737 |  |  |  | $ 17,373 | $ 16,737 | $ 17,373 | $ 16,234
Charge-offs |  |  |  |  |  |  |  |  | (4,961) | (3,718) | (3,182)
Recoveries |  |  |  |  |  |  |  |  | 405 | 522 | 481
Provision for loan losses | $ 2,111 | $ 622 | $ 220 | 1,196 | $ 668 | $ 463 | $ 486 | 943 | 4,149 | 2,560 | 3,840
Allowances for loan losses, Ending Balance | 16,330 |  |  |  | 16,737 |  |  |  | 16,330 | 16,737 | 17,373
Commercial, Industrial, and Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 6,035 |  |  |  | 7,114 | 6,035 | 7,114 | 8,212
Charge-offs |  |  |  |  |  |  |  |  | (601) | (307) | (618)
Recoveries |  |  |  |  |  |  |  |  | 89 | 267 | 1
Provision for loan losses |  |  |  |  |  |  |  |  | (95) | (1,039) | (481)
Allowances for loan losses, Ending Balance | 5,428 |  |  |  | 6,035 |  |  |  | 5,428 | 6,035 | 7,114
Commercial Mortgages [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 5,605 |  |  |  | 5,310 | 5,605 | 5,310 | 3,536
Charge-offs |  |  |  |  |  |  |  |  | (201) | (486) | (50)
Recoveries |  |  |  |  |  |  |  |  | 8 | 52 | 210
Provision for loan losses |  |  |  |  |  |  |  |  | 1,341 | 729 | 1,614
Allowances for loan losses, Ending Balance | 6,753 |  |  |  | 5,605 |  |  |  | 6,753 | 5,605 | 5,310
Residential Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 2,475 |  |  |  | 2,479 | 2,475 | 2,479 | 2,450
Charge-offs |  |  |  |  |  |  |  |  | (499) | (632) | (436)
Recoveries |  |  |  |  |  |  |  |  | 93 | 8 | 41
Provision for loan losses |  |  |  |  |  |  |  |  | (416) | 620 | 424
Allowances for loan losses, Ending Balance | 1,653 |  |  |  | 2,475 |  |  |  | 1,653 | 2,475 | 2,479
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 2,371 |  |  |  | 2,205 | 2,371 | 2,205 | 1,763
Charge-offs |  |  |  |  |  |  |  |  | (3,324) | (1,956) | (1,744)
Recoveries |  |  |  |  |  |  |  |  | 122 | 96 | 93
Provision for loan losses |  |  |  |  |  |  |  |  | 3,046 | 2,026 | 2,093
Allowances for loan losses, Ending Balance | 2,215 |  |  |  | 2,371 |  |  |  | 2,215 | 2,371 | 2,205
Credit Cards [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 90 |  |  |  | 71 | 90 | 71 | 66
Charge-offs |  |  |  |  |  |  |  |  | (96) | (116) | (78)
Recoveries |  |  |  |  |  |  |  |  | 22 | 14 | 25
Provision for loan losses |  |  |  |  |  |  |  |  | 77 | 121 | 58
Allowances for loan losses, Ending Balance | 93 |  |  |  | 90 |  |  |  | 93 | 90 | 71
Overdrafts [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | $ 161 |  |  |  | $ 194 | 161 | 194 | 207
Charge-offs |  |  |  |  |  |  |  |  | (240) | (221) | (256)
Recoveries |  |  |  |  |  |  |  |  | 71 | 85 | 111
Provision for loan losses |  |  |  |  |  |  |  |  | 196 | 103 | 132
Allowances for loan losses, Ending Balance | $ 188 |  |  |  | $ 161 |  |  |  | $ 188 | $ 161 | $ 194

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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=66008989&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=66008989&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=66008989&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=66902209&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=66008989&loc=SL6953423-111524 + Details
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