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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 22,330 | $ 26,424 | $ 22,434 | $ 24,827
Interest Income Recognized, Total | 4 | 6 | 11 | 17
Cash Basis Interest Recognized, Total | 4 | 6 | 11 | 17
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 1,267 | 4,140 | 1,439 | 3,406
Interest Income Recognized, Related Allowance | 3 | 0 | 4 | 3
Cash Basis Interest Recognized, Related Allowance | 3 | 0 | 4 | 3
Average Recorded Investment, No Related Allowance | 2,055 | 3,506 | 2,121 | 3,459
Interest Income Recognized, No Related Allowance | 0 | 0 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 0 | 0 | 0
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 8,337 | 6,180 | 7,657 | 5,549
Interest Income Recognized, Related Allowance | 0 | 3 | 3 | 3
Cash Basis Interest Recognized, Related Allowance | 0 | 3 | 3 | 3
Average Recorded Investment, No Related Allowance | 10,602 | 11,971 | 10,888 | 12,016
Interest Income Recognized, No Related Allowance | 0 | 0 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 0 | 0 | 0
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 0 | 476 | 191 | 322
Interest Income Recognized, Related Allowance | 1 | 3 | 4 | 11
Cash Basis Interest Recognized, Related Allowance | 1 | 3 | 4 | 11
Average Recorded Investment, No Related Allowance | 69 | 151 | 138 | 75
Interest Income Recognized, No Related Allowance | 0 | 0 | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 0 | $ 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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