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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | $ 15,988 | $ 17,504 | $ 16,737 | $ 17,373
Charge-offs | (993) | (790) | (3,401) | (2,276)
Recoveries | 86 | 59 | 329 | 247
Provision (benefit) for loan losses | 622 | 463 | 2,038 | 1,892
Allowances for loan losses, Ending Balance | 15,703 | 17,236 | 15,703 | 17,236
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 5,218 | 6,598 | 6,035 | 7,114
Charge-offs | (86) | (80) | (519) | (219)
Recoveries | 37 | 12 | 84 | 39
Provision (benefit) for loan losses | (24) | 89 | (455) | (315)
Allowances for loan losses, Ending Balance | 5,145 | 6,619 | 5,145 | 6,619
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 6,207 | 5,928 | 5,605 | 5,310
Charge-offs | 0 | 0 | (20) | 0
Recoveries | 2 | 1 | 7 | 51
Provision (benefit) for loan losses | 27 | (384) | 644 | 184
Allowances for loan losses, Ending Balance | 6,236 | 5,545 | 6,236 | 5,545
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,299 | 2,612 | 2,475 | 2,479
Charge-offs | (95) | (191) | (244) | (347)
Recoveries | 10 | 4 | 72 | 5
Provision (benefit) for loan losses | (65) | 115 | (154) | 403
Allowances for loan losses, Ending Balance | 2,149 | 2,540 | 2,149 | 2,540
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,066 | 2,118 | 2,371 | 2,205
Charge-offs | (709) | (448) | (2,397) | (1,448)
Recoveries | 20 | 21 | 94 | 76
Provision (benefit) for loan losses | 545 | 585 | 1,854 | 1,443
Allowances for loan losses, Ending Balance | 1,922 | 2,276 | 1,922 | 2,276
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 50 | 98 | 90 | 71
Charge-offs | (17) | (17) | (54) | (103)
Recoveries | 3 | 3 | 18 | 8
Provision (benefit) for loan losses | 36 | 14 | 18 | 122
Allowances for loan losses, Ending Balance | 72 | 98 | 72 | 98
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 148 | 150 | 161 | 194
Charge-offs | (86) | (54) | (167) | (159)
Recoveries | 14 | 18 | 54 | 68
Provision (benefit) for loan losses | 103 | 44 | 131 | 55
Allowances for loan losses, Ending Balance | $ 179 | $ 158 | $ 179 | $ 158

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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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