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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 18,403 | $ 24,193 | $ 18,371 | $ 25,418
Interest Income Recognized, Total | 4 | 3 | 13 | 7
Cash Basis Interest Recognized, Total | 4 | 3 | 13 | 7
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 4,318 | 1,459 | 4,438 | 1,621
Interest Income Recognized, Related Allowance | 1 | 1 | 2 | 1
Cash Basis Interest Recognized, Related Allowance | 1 | 1 | 2 | 1
Average Recorded Investment, No Related Allowance | 2,234 | 2,172 | 2,167 | 2,184
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 | 5,402 | 5,787 | 5,416 | 6,009
Interest Income Recognized, Related Allowance | 0 | 0 | 0 | 3
Cash Basis Interest Recognized, Related Allowance | 0 | 0 | 0 | 3
Average Recorded Investment, No Related Allowance | 6,249 | 14,637 | 6,217 | 15,270
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 | 200 | 62 | 133 | 191
Interest Income Recognized, Related Allowance | 3 | 2 | 11 | 3
Cash Basis Interest Recognized, Related Allowance | 3 | 2 | 11 | 3
Average Recorded Investment, No Related Allowance | 0 | 76 | 0 | 143
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=35738203&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=35738203&loc=d3e5258-111524 + Details
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