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Changes in Fair Value of Loans Held for Sale (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Mortgage Banking Income | [1] | $ 727 | $ (21,432) | $ (54,468) | $ (24,378)
Loans held for sale |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Mortgage Banking Income | [1] | 9,644 | 6,328 | 28,687 | 10,714
Mortgage servicing rights |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Mortgage Banking Income | [1] | $ (8,917) | $ (27,760) | $ (83,155) | $ (35,092)
[1] | Does not include the effect of hedging activities, which is included in "Other non-interest income."

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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=6957238&loc=d3e14172-108612 + Details
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