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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 USD ($) Contract | Mar. 31, 2016 USD ($) Contract
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | Contract | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | Contract | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0
Consumer Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified in the Last 3 Months | Contract | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 138
Post-Modification Outstanding Recorded Investment | $ 0 | $ 138

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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