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Changes in Fair Value of Loans Held for Sale (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | [2] | Jun. 30, 2017 | Jun. 30, 2016 | [2]
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Mortgage Banking Income | [1] | $ (6,963) | $ (30,055) | $ (9,753) | $ (64,279)
Loans held for sale |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Mortgage Banking Income | [1] | 658 | 933 | 595 | 3,802
Mortgage servicing rights | Covered loans held for sale |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Mortgage Banking Income | [1] | $ (7,621) | $ (30,988) | $ (10,348) | $ (68,081)
[1] | Does not include the effect of economic hedging activities, which is included in "Other non-interest income."
[2] | The presentation of the amounts for the three and six months ended June 30, 2016 has been modified to conform to the presentation for the three and six months ended June 30, 2017.

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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