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Loans - Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | $ 16,234 | $ 14,060
Charge-offs | (650) | (1,169)
Recoveries | 71 | 76
Provision (benefit) for loan losses | 1,019 | 930
Allowances for loan losses, Ending Balance | 16,674 | 13,897
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 6,394 | 4,940
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision (benefit) for loan losses | 734 | 331
Allowances for loan losses, Ending Balance | 7,128 | 5,271
Commercial Mortgages [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 5,354 | 4,697
Charge-offs | (50) | (607)
Recoveries | 0 | 1
Provision (benefit) for loan losses | (570) | 208
Allowances for loan losses, Ending Balance | 4,734 | 4,299
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 2,880 | 2,466
Charge-offs | (122) | (172)
Recoveries | 19 | 1
Provision (benefit) for loan losses | (202) | 100
Allowances for loan losses, Ending Balance | 2,575 | 2,395
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 1,333 | 1,699
Charge-offs | (399) | (331)
Recoveries | 22 | 41
Provision (benefit) for loan losses | 1,016 | 298
Allowances for loan losses, Ending Balance | 1,972 | 1,707
Credit Cards [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 66 | 83
Charge-offs | (21) | (12)
Recoveries | 2 | 2
Provision (benefit) for loan losses | 21 | 4
Allowances for loan losses, Ending Balance | 68 | 77
Overdrafts [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 207 | 175
Charge-offs | (58) | (47)
Recoveries | 28 | 31
Provision (benefit) for loan losses | 20 | (11)
Allowances for loan losses, Ending Balance | $ 197 | $ 148

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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=28368275&loc=SL6953423-111524 + Details
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Balance Type: | credit
Period Type: | duration

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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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