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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 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Total | $ 19,808 | $ 29,225
Recorded Investment, Total | 18,308 | 25,520
Allowance for Loan Losses Allocated | 1,882 | 1,852
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 5,402 | 2,542
Recorded Investment, Related Allowance | 4,152 | 1,792
Allowance for Loan Losses Allocated | 372 | 541
Unpaid Principal Balance, No Related Allowance | 2,055 | 2,804
Recorded Investment, No Related Allowance | 2,034 | 2,251
Allowance for Loan Losses Allocated, No Related Allowance | 0 | 0
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance, Related Allowance | 6,173 | 5,870
Recorded Investment, Related Allowance | 5,970 | 5,329
Allowance for Loan Losses Allocated | 1,510 | 1,230
Unpaid Principal Balance, No Related Allowance | 6,178 | 17,285
Recorded Investment, No Related Allowance | 6,152 | 15,555
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 | 416
Recorded Investment, Related Allowance | 0 | 381
Allowance for Loan Losses Allocated | 0 | 81
Unpaid Principal Balance, No Related Allowance | 0 | 308
Recorded Investment, No Related Allowance | 0 | 212
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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