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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total | $ 20,931 | $ 19,157 | $ 22,757
Interest Income Recognized, Total | 85 | 329 | 17
Cash Basis Interest Recognized, Total | 85 | 329 | 17
Commercial, Industrial, and Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 5,667 | 4,621 | 1,989
Interest Income Recognized, Related Allowance | 44 | 73 | 7
Cash Basis Interest Recognized, Related Allowance | 44 | 73 | 7
Average Recorded Investment, No Related Allowance | 1,831 | 1,972 | 2,124
Interest Income Recognized, No Related Allowance | 14 | 31 | 0
Cash Basis Interest Recognized, No Related Allowance | 14 | 31 | 0
Commercial Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 8,154 | 6,374 | 6,572
Interest Income Recognized, Related Allowance | 0 | 85 | 3
Cash Basis Interest Recognized, Related Allowance | 0 | 85 | 3
Average Recorded Investment, No Related Allowance | 4,806 | 5,868 | 11,885
Interest Income Recognized, No Related Allowance | 0 | 78 | 0
Cash Basis Interest Recognized, No Related Allowance | 0 | 78 | 0
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Related Allowance | 370 | 240 | 101
Interest Income Recognized, Related Allowance | 21 | 46 | 7
Cash Basis Interest Recognized, Related Allowance | 21 | 46 | 7
Average Recorded Investment, No Related Allowance | 103 | 82 | 86
Interest Income Recognized, No Related Allowance | 6 | 16 | 0
Cash Basis Interest Recognized, No Related Allowance | $ 6 | $ 16 | $ 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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