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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | $ 17,373 |  |  |  | $ 16,234 | $ 17,373 | $ 16,234 | $ 14,060
Charge-offs |  |  |  |  |  |  |  |  | (3,718) | (3,182) | (5,630)
Recoveries |  |  |  |  |  |  |  |  | 522 | 481 | 1,666
Provision for loan losses | $ 668 | $ 463 | $ 486 | 943 | $ 282 | $ 1,038 | $ 1,501 | 1,019 | 2,560 | 3,840 | 6,138
Allowances for loan losses, Ending Balance | 16,737 |  |  |  | 17,373 |  |  |  | 16,737 | 17,373 | 16,234
Commercial, Industrial, and Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 7,114 |  |  |  | 8,212 | 7,114 | 8,212 | 4,940
Charge-offs |  |  |  |  |  |  |  |  | (307) | (618) | (958)
Recoveries |  |  |  |  |  |  |  |  | 267 | 1 | 7
Provision for loan losses |  |  |  |  |  |  |  |  | (1,039) | (481) | 4,223
Allowances for loan losses, Ending Balance | 6,035 |  |  |  | 7,114 |  |  |  | 6,035 | 7,114 | 8,212
Commercial Mortgages [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 5,310 |  |  |  | 3,536 | 5,310 | 3,536 | 4,697
Charge-offs |  |  |  |  |  |  |  |  | (486) | (50) | (1,931)
Recoveries |  |  |  |  |  |  |  |  | 52 | 210 | 1,430
Provision for loan losses |  |  |  |  |  |  |  |  | 729 | 1,614 | (660)
Allowances for loan losses, Ending Balance | 5,605 |  |  |  | 5,310 |  |  |  | 5,605 | 5,310 | 3,536
Residential Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 2,479 |  |  |  | 2,450 | 2,479 | 2,450 | 2,466
Charge-offs |  |  |  |  |  |  |  |  | (632) | (436) | (467)
Recoveries |  |  |  |  |  |  |  |  | 8 | 41 | 5
Provision for loan losses |  |  |  |  |  |  |  |  | 620 | 424 | 446
Allowances for loan losses, Ending Balance | 2,475 |  |  |  | 2,479 |  |  |  | 2,475 | 2,479 | 2,450
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 2,205 |  |  |  | 1,763 | 2,205 | 1,763 | 1,699
Charge-offs |  |  |  |  |  |  |  |  | (1,956) | (1,744) | (1,919)
Recoveries |  |  |  |  |  |  |  |  | 96 | 93 | 114
Provision for loan losses |  |  |  |  |  |  |  |  | 2,026 | 2,093 | 1,869
Allowances for loan losses, Ending Balance | 2,371 |  |  |  | 2,205 |  |  |  | 2,371 | 2,205 | 1,763
Credit Cards [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 71 |  |  |  | 66 | 71 | 66 | 83
Charge-offs |  |  |  |  |  |  |  |  | (116) | (78) | (97)
Recoveries |  |  |  |  |  |  |  |  | 14 | 25 | 16
Provision for loan losses |  |  |  |  |  |  |  |  | 121 | 58 | 64
Allowances for loan losses, Ending Balance | 90 |  |  |  | 71 |  |  |  | 90 | 71 | 66
Overdrafts [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | $ 194 |  |  |  | $ 207 | 194 | 207 | 175
Charge-offs |  |  |  |  |  |  |  |  | (221) | (256) | (258)
Recoveries |  |  |  |  |  |  |  |  | 85 | 111 | 94
Provision for loan losses |  |  |  |  |  |  |  |  | 103 | 132 | 196
Allowances for loan losses, Ending Balance | $ 161 |  |  |  | $ 194 |  |  |  | $ 161 | $ 194 | $ 207

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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=49124121&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=49124121&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=49124121&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=56944662&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=49124121&loc=SL6953423-111524 + Details
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