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Changes in Fair Value of MSRs (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
(Loss) Gain Included in Income from Changes in Fair Value	[1]	$ (9,279)	$ (224)	$ (19,033)
Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
(Loss) Gain Included in Income from Changes in Fair Value	[1]	464		1,059
Mortgage servicing rights
Fair Value, Option, Quantitative Disclosures [Line Items]
(Loss) Gain Included in Income from Changes in Fair Value	[1]	$ (9,743)	$ (224)	$ (20,092)
[1] Included in "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://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

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+ References

No definition available.

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