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Loans - Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | $ 14,060 |  |  |  | $ 12,615 | $ 14,060 | $ 12,615 | $ 10,820
Charge-offs |  |  |  |  |  |  |  |  | (5,630) | (5,190) | (3,356)
Recoveries |  |  |  |  |  |  |  |  | 1,666 | 254 | 214
Provision for loan losses | 1,247 | 846 | 3,115 | 930 | 2,343 | 1,188 | 1,746 | 1,104 | 6,138 | 6,381 | 4,937
Allowances for loan losses, Ending Balance | 16,234 |  |  |  | 14,060 |  |  |  | 16,234 | 14,060 | 12,615
Commercial, Industrial, and Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 4,940 |  |  |  | 4,511 | 4,940 | 4,511 | 3,517
Charge-offs |  |  |  |  |  |  |  |  | (958) | (2,871) | (1,796)
Recoveries |  |  |  |  |  |  |  |  | 7 | 45 | 9
Provision for loan losses |  |  |  |  |  |  |  |  | 2,290 | 3,255 | 2,781
Allowances for loan losses, Ending Balance | 6,279 |  |  |  | 4,940 |  |  |  | 6,279 | 4,940 | 4,511
Commercial Mortgages [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 4,697 |  |  |  | 4,470 | 4,697 | 4,470 | 3,511
Charge-offs |  |  |  |  |  |  |  |  | (1,931) | (401) | (175)
Recoveries |  |  |  |  |  |  |  |  | 1,430 | 0 | 0
Provision for loan losses |  |  |  |  |  |  |  |  | 1,273 | 628 | 1,134
Allowances for loan losses, Ending Balance | 5,469 |  |  |  | 4,697 |  |  |  | 5,469 | 4,697 | 4,470
Residential Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 2,466 |  |  |  | 1,991 | 2,466 | 1,991 | 1,916
Charge-offs |  |  |  |  |  |  |  |  | (467) | (304) | (217)
Recoveries |  |  |  |  |  |  |  |  | 5 | 1 | 13
Provision for loan losses |  |  |  |  |  |  |  |  | 876 | 778 | 279
Allowances for loan losses, Ending Balance | 2,880 |  |  |  | 2,466 |  |  |  | 2,880 | 2,466 | 1,991
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 1,699 |  |  |  | 1,404 | 1,699 | 1,404 | 1,561
Charge-offs |  |  |  |  |  |  |  |  | (1,919) | (1,279) | (907)
Recoveries |  |  |  |  |  |  |  |  | 114 | 91 | 88
Provision for loan losses |  |  |  |  |  |  |  |  | 1,439 | 1,483 | 662
Allowances for loan losses, Ending Balance | 1,333 |  |  |  | 1,699 |  |  |  | 1,333 | 1,699 | 1,404
Credit Cards [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 83 |  |  |  | 71 | 83 | 71 | 96
Charge-offs |  |  |  |  |  |  |  |  | (97) | (78) | (39)
Recoveries |  |  |  |  |  |  |  |  | 16 | 18 | 10
Provision for loan losses |  |  |  |  |  |  |  |  | 64 | 72 | 4
Allowances for loan losses, Ending Balance | 66 |  |  |  | 83 |  |  |  | 66 | 83 | 71
Overdrafts [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowances for loan losses, Beginning Balance |  |  |  | 175 |  |  |  | 168 | 175 | 168 | 219
Charge-offs |  |  |  |  |  |  |  |  | (258) | (257) | (222)
Recoveries |  |  |  |  |  |  |  |  | 94 | 99 | 94
Provision for loan losses |  |  |  |  |  |  |  |  | 196 | 165 | 77
Allowances for loan losses, Ending Balance | $ 207 |  |  |  | $ 175 |  |  |  | $ 207 | $ 175 | $ 168

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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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