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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 USD ($) Contract | Mar. 31, 2015 USD ($) Contract
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | Contract |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 28
Post-Modification Outstanding Recorded Investment |  | $ 24
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | Contract |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 528
Post-Modification Outstanding Recorded Investment |  | $ 430
Consumer Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | Contract | 1 |
Pre-Modification Outstanding Recorded Investment | $ 138 |
Post-Modification Outstanding Recorded Investment | $ 138 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524 + Details
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