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Changes in Fair Value of Loans Held for Sale (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | [2]
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Mortgage Banking Income | [1] | $ (2,789) | $ (34,224)
Loans held for sale |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Mortgage Banking Income | [1] | (63) | 2,869
Mortgage servicing rights |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Mortgage Banking Income | [1] | $ (2,726) | $ (37,093)
[1] | Does not include the effect of hedging activities, which is included in "Other non-interest income."
[2] | The presentation of the amounts for the three months ended March 31, 2016 has been modified to conform to the presentation for the three months ended March 31, 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=6957238&loc=d3e14172-108612 + Details
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