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Activity in Allowance for Losses on Covered Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |  |  |
Balance, beginning of period |  | $ 31,395 | $ 45,481 | $ 64,069
Provision for (recovery of) losses |  | 4,180 | (15,004) | (18,587)
Transfer to the allowance for losses on covered loans | [1] |  | (2,416) |
Balance, end of period |  | 23,701 | 31,395 | 45,481
Covered |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Provision for (recovery of) losses |  | $ (7,694) | $ (11,670) | $ (18,588)
[1] | Represents the allowance associated with $14.2 million of loans acquired in the Desert Hills transaction that were transferred from covered loans to non-covered loans upon expiration of the related FDIC loss sharing agreement in March 2015.

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance for loan and lease losses covered by loss sharing agreements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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