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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total | $ 22,757 | $ 24,964 | $ 18,392
Interest Income Recognized, Total | 17 | 20 | 26
Cash Basis Interest Recognized, Total | 17 | 20 | 26
Commercial, Industrial, and Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 1,989 | 3,083 | 3,711
Interest Income Recognized, Related Allowance | 7 | 4 | 3
Cash Basis Interest Recognized, Related Allowance | 7 | 4 | 3
Average Recorded Investment, No Related Allowance | 2,124 | 3,217 | 2,050
Interest Income Recognized, No Related Allowance | 0 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 0 | 0
Commercial Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 6,572 | 5,504 | 6,412
Interest Income Recognized, Related Allowance | 3 | 3 | 19
Cash Basis Interest Recognized, Related Allowance | 3 | 3 | 19
Average Recorded Investment, No Related Allowance | 11,885 | 12,723 | 6,040
Interest Income Recognized, No Related Allowance | 0 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 0 | 0
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 101 | 334 | 179
Interest Income Recognized, Related Allowance | 7 | 13 | 4
Cash Basis Interest Recognized, Related Allowance | 7 | 13 | 4
Average Recorded Investment, No Related Allowance | 86 | 103 | 0
Interest Income Recognized, No Related Allowance | 0 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 0 | $ 0 | $ 0

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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