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Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Certain impaired loans | [1] | $ 45,837 | $ 15,635
Other assets | [2] | 4,357 | 5,684
Total |  | 50,194 | 21,319
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Certain impaired loans | [1] | 45,837 | 15,635
Other assets | [2] | 4,357 | 5,684
Total |  | $ 50,194 | $ 21,319
[1] | Represents the fair value of impaired loans, based on the value of the collateral.
[2] | Represents the fair value of OREO, based on the appraised value of the collateral subsequent to its initial classification as OREO.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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