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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) - Commercial and Industrial [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Contract
Financing Receivable Modifications [Line Items] |
Number of Contracts Modified in the Last 12 Months | Contract | 1
Pre-Modification Outstanding Recorded Investment | $ 38
Post-Modification Outstanding Recorded Investment | $ 38

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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