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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Total | $ 15,442 | $ 22,898 | $ 15,886 | $ 22,702
Interest Income Recognized, Total | 11 | 24 | 17 | 73
Cash Basis Interest Recognized, Total | 11 | 24 | 17 | 73
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 3,150 | 6,315 | 3,249 | 6,071
Interest Income Recognized, Related Allowance | 2 | 7 | 2 | 42
Cash Basis Interest Recognized, Related Allowance | 2 | 7 | 2 | 42
Average Recorded Investment, No Related Allowance | 2,525 | 1,689 | 2,612 | 1,631
Interest Income Recognized, No Related Allowance | 2 | 2 | 2 | 12
Cash Basis Interest Recognized, No Related Allowance | 2 | 2 | 2 | 12
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 5,309 | 9,646 | 5,320 | 9,617
Interest Income Recognized, Related Allowance | 4 | 0 | 4 | 0
Cash Basis Interest Recognized, Related Allowance | 4 | 0 | 4 | 0
Average Recorded Investment, No Related Allowance | 4,458 | 4,719 | 4,622 | 4,854
Interest Income Recognized, No Related Allowance | 3 | 0 | 3 | 0
Cash Basis Interest Recognized, No Related Allowance | 3 | 0 | 3 | 0
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment, Related Allowance | 0 | 400 | 83 | 400
Interest Income Recognized, Related Allowance | 0 | 11 | 6 | 13
Cash Basis Interest Recognized, Related Allowance | 0 | 11 | 6 | 13
Average Recorded Investment, No Related Allowance | 0 | 129 | 0 | 129
Interest Income Recognized, No Related Allowance | 0 | 4 | 0 | 6
Cash Basis Interest Recognized, No Related Allowance | $ 0 | $ 4 | $ 0 | $ 6

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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=66008989&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=66008989&loc=d3e5258-111524 + Details
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