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Derivatives - Summary of Gains Losses on Derivative Contracts Included in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Rate lock commitments | Compensation and employee benefits
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income for derivatives	$ 1,100	$ 500	$ 2,200	$ 900
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income for derivatives	(2,774)	(3,253)	(2,042)	(1,008)
Not Designated as Hedging Instrument | Nasdaq Forwards | Other income (loss), net
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income for derivatives	(6,802)	(22,945)	(12,404)	(1,772)
Not Designated as Hedging Instrument | Rate lock commitments | Gains (loss) from mortgage banking activities/originations, net
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income for derivatives	15,149	(10,208)	19,843	49,955
Not Designated as Hedging Instrument | Rate lock commitments | Compensation and employee benefits
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income for derivatives	(1,060)	512	(2,177)	(899)
Not Designated as Hedging Instrument | Forward sale contracts | Gains (loss) from mortgage banking activities/originations, net
Derivative Instruments, Gain (Loss)
Gain (loss) recognized in income for derivatives	$ (10,061)	$ 29,388	$ (7,304)	$ (48,292)

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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