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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Total | $ 16,322 | $ 23,401
Interest Income Recognized, Total | 6 | 49
Cash Basis Interest Recognized, Total | 6 | 49
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 3,379 | 5,981
Interest Income Recognized, Related Allowance | 0 | 35
Cash Basis Interest Recognized, Related Allowance | 0 | 35
Average Recorded Investment, No Related Allowance | 2,691 | 1,636
Interest Income Recognized, No Related Allowance | 0 | 10
Cash Basis Interest Recognized, No Related Allowance | 0 | 10
Commercial Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment, Related Allowance | 5,408 | 10,241
Interest Income Recognized, Related Allowance | 0 | 0
Cash Basis Interest Recognized, Related Allowance | 0 | 0
Average Recorded Investment, No Related Allowance | 4,720 | 4,886
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 | 124 | 400
Interest Income Recognized, Related Allowance | 5 | 2
Cash Basis Interest Recognized, Related Allowance | 5 | 2
Average Recorded Investment, No Related Allowance | 0 | 257
Interest Income Recognized, No Related Allowance | 1 | 2
Cash Basis Interest Recognized, No Related Allowance | $ 1 | $ 2

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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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