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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 22,898 | $ 18,403 | $ 22,702 | $ 18,371
Interest Income Recognized, Total | 24 | 4 | 73 | 13
Cash Basis Interest Recognized, Total | 24 | 4 | 73 | 13
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 6,315 | 4,318 | 6,071 | 4,438
Interest Income Recognized, Related Allowance | 7 | 1 | 42 | 2
Cash Basis Interest Recognized, Related Allowance | 7 | 1 | 42 | 2
Average Recorded Investment, No Related Allowance | 1,689 | 2,234 | 1,631 | 2,167
Interest Income Recognized, No Related Allowance | 2 | 0 | 12 | 0
Cash Basis Interest Recognized, No Related Allowance | 2 | 0 | 12 | 0
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 9,646 | 5,402 | 9,617 | 5,416
Interest Income Recognized, Related Allowance | 0 | 0 | 0 | 0
Cash Basis Interest Recognized, Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment, No Related Allowance | 4,719 | 6,249 | 4,854 | 6,217
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 | 400 | 200 | 400 | 133
Interest Income Recognized, Related Allowance | 11 | 3 | 13 | 11
Cash Basis Interest Recognized, Related Allowance | 11 | 3 | 13 | 11
Average Recorded Investment, No Related Allowance | 129 | 0 | 129 | 0
Interest Income Recognized, No Related Allowance | 4 | 0 | 6 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 4 | $ 0 | $ 6 | $ 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=49124121&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=49124121&loc=d3e5258-111524 + Details
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