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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Total | $ 19,079 | $ 24,294
Interest Income Recognized, Total | 9 | 4
Cash Basis Interest Recognized, Total | 9 | 4
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 4,660 | 1,630
Interest Income Recognized, Related Allowance | 1 | 0
Cash Basis Interest Recognized, Related Allowance | 1 | 0
Average Recorded Investment, No Related Allowance | 2,130 | 2,238
Interest Income Recognized, No Related Allowance | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 0
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 5,319 | 5,107
Interest Income Recognized, Related Allowance | 0 | 3
Cash Basis Interest Recognized, Related Allowance | 0 | 3
Average Recorded Investment, No Related Allowance | 6,970 | 14,922
Interest Income Recognized, No Related Allowance | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 0
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 0 | 252
Interest Income Recognized, Related Allowance | 8 | 1
Cash Basis Interest Recognized, Related Allowance | 8 | 1
Average Recorded Investment, No Related Allowance | 0 | 145
Interest Income Recognized, No Related Allowance | 0 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 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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