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Loans - Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | $ 15,500 | $ 13,690 | $ 14,060 | $ 12,615
Charge-offs | (590) | (1,277) | (3,342) | (3,172)
Recoveries | 1,465 | 48 | 1,612 | 168
Provision (benefit) for loan losses | 846 | 1,188 | 4,891 | 4,038
Allowances for loan losses, Ending Balance | 17,221 | 13,649 | 17,221 | 13,649
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 5,338 | 5,115 | 4,940 | 4,511
Charge-offs | (169) | (751) | (253) | (1,398)
Recoveries | 0 | 6 | 7 | 14
Provision (benefit) for loan losses | 384 | 103 | 859 | 1,346
Allowances for loan losses, Ending Balance | 5,553 | 4,473 | 5,553 | 4,473
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 5,896 | 4,553 | 4,697 | 4,470
Charge-offs | (4) | (165) | (1,534) | (401)
Recoveries | 1,424 | 0 | 1,427 | 0
Provision (benefit) for loan losses | (275) | 504 | 2,451 | 823
Allowances for loan losses, Ending Balance | 7,041 | 4,892 | 7,041 | 4,892
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,508 | 2,225 | 2,466 | 1,991
Charge-offs | (57) | (7) | (398) | (231)
Recoveries | 1 | 1 | 5 | 1
Provision (benefit) for loan losses | 189 | 113 | 568 | 571
Allowances for loan losses, Ending Balance | 2,641 | 2,332 | 2,641 | 2,332
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 1,555 | 1,568 | 1,699 | 1,404
Charge-offs | (269) | (252) | (946) | (890)
Recoveries | 21 | 18 | 95 | 67
Provision (benefit) for loan losses | 454 | 372 | 913 | 1,125
Allowances for loan losses, Ending Balance | 1,761 | 1,706 | 1,761 | 1,706
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 55 | 81 | 83 | 71
Charge-offs | (19) | (22) | (48) | (55)
Recoveries | 3 | 1 | 13 | 8
Provision (benefit) for loan losses | 18 | 19 | 9 | 55
Allowances for loan losses, Ending Balance | 57 | 79 | 57 | 79
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 148 | 148 | 175 | 168
Charge-offs | (72) | (80) | (163) | (197)
Recoveries | 16 | 22 | 65 | 78
Provision (benefit) for loan losses | 76 | 77 | 91 | 118
Allowances for loan losses, Ending Balance | $ 168 | $ 167 | $ 168 | $ 167

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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=28368275&loc=SL6953423-111524 + Details
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Balance Type: | credit
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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=28368275&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=28368275&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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: 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 + Details
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