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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | $ 17,504 | $ 17,415 | $ 17,373 | $ 16,234
Charge-offs | (790) | (675) | (2,276) | (2,155)
Recoveries | 59 | 65 | 247 | 206
Provision (benefit) for loan losses | 463 | 1,038 | 1,892 | 3,558
Allowances for loan losses, Ending Balance | 17,236 | 17,843 | 17,236 | 17,843
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 6,598 | 8,096 | 7,114 | 8,212
Charge-offs | (80) | (60) | (219) | (379)
Recoveries | 12 | 0 | 39 | 1
Provision (benefit) for loan losses | 89 | 690 | (315) | 892
Allowances for loan losses, Ending Balance | 6,619 | 8,726 | 6,619 | 8,726
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 5,928 | 4,581 | 5,310 | 3,536
Charge-offs | 0 | (92) | 0 | (142)
Recoveries | 1 | 0 | 51 | 10
Provision (benefit) for loan losses | (384) | (291) | 184 | 794
Allowances for loan losses, Ending Balance | 5,545 | 4,198 | 5,545 | 4,198
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,612 | 2,467 | 2,479 | 2,450
Charge-offs | (191) | (17) | (347) | (215)
Recoveries | 4 | 18 | 5 | 37
Provision (benefit) for loan losses | 115 | 93 | 403 | 289
Allowances for loan losses, Ending Balance | 2,540 | 2,561 | 2,540 | 2,561
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,118 | 1,996 | 2,205 | 1,763
Charge-offs | (448) | (415) | (1,448) | (1,183)
Recoveries | 21 | 25 | 76 | 78
Provision (benefit) for loan losses | 585 | 467 | 1,443 | 1,415
Allowances for loan losses, Ending Balance | 2,276 | 2,073 | 2,276 | 2,073
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 98 | 88 | 71 | 66
Charge-offs | (17) | (16) | (103) | (39)
Recoveries | 3 | 4 | 8 | 7
Provision (benefit) for loan losses | 14 | 3 | 122 | 45
Allowances for loan losses, Ending Balance | 98 | 79 | 98 | 79
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 150 | 187 | 194 | 207
Charge-offs | (54) | (75) | (159) | (197)
Recoveries | 18 | 18 | 68 | 73
Provision (benefit) for loan losses | 44 | 76 | 55 | 123
Allowances for loan losses, Ending Balance | $ 158 | $ 206 | $ 158 | $ 206

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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 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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