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Loans - Loans Individually Evaluated for Impairment Including Loans Modified in Troubled Debt Restructurings by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Total | $ 19,989 | $ 19,808
Recorded Investment, Total | 17,655 | 18,308
Allowance for Loan Losses Allocated | 2,227 | 1,882
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 5,891 | 5,929
Recorded Investment, Related Allowance | 4,641 | 4,679
Allowance for Loan Losses Allocated | 960 | 487
Unpaid Principal Balance, No Related Allowance | 3,046 | 2,055
Recorded Investment, No Related Allowance | 2,226 | 2,034
Allowance for Loan Losses Allocated, No Related Allowance | 0 | 0
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 5,459 | 5,646
Recorded Investment, Related Allowance | 5,195 | 5,443
Allowance for Loan Losses Allocated | 1,267 | 1,395
Unpaid Principal Balance, No Related Allowance | 5,593 | 6,178
Recorded Investment, No Related Allowance | 5,593 | 6,152
Allowance for Loan Losses Allocated, No Related Allowance | 0 | 0
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 0 | 0
Recorded Investment, Related Allowance | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Unpaid Principal Balance, No Related Allowance | 0 | 0
Recorded Investment, No Related Allowance | 0 | 0
Allowance for Loan Losses Allocated, No Related Allowance | $ 0 | $ 0

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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