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Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Jan. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Payments for business acquisitions						$ 83,251	$ 163,724
Goodwill impairment		$ 0			$ 0	(20,190)	0
Severance expense			$ 10,300
Customer deposits		403,646				403,646					$ 294,427
Contract asset insurance renewals		36,800				36,800					35,100
Residential mortgage loans available-for-sale fair value		400,067				400,067					508,967
Residential mortgage loans available-for-sale aggregate outstanding principal balance		382,900				382,900					494,100
Changes in fair value, gain (loss)		(700)			600	(2,100)	(700)
Net gains from the sale of mortgages		76,600			$ 36,300	$ 173,800	$ 90,600
Variability in future cash flows of derivative instruments in days						60 days
Assets In-Scope Under Accounting Standards Codification 326		195,200				$ 195,200
Interest rate lock commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount		471,600				471,600					255,300
Forward contracts
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount		671,000				671,000					518,200
Whole loan commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount		$ 148,000				148,000					$ 200,700
Innovative Construction Group [Member]
Finite-Lived Intangible Assets [Line Items]
Consideration for business acquisition	$ 104,000
Payments for business acquisitions	83,300
Goodwill	48,700
Goodwill impairment				$ (20,200)		$ (20,200)
Innovative Construction Group [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset acquired	$ 27,800
Intangible asset, amortization period	7 years
Innovative Construction Group [Member] | Trade Name
Finite-Lived Intangible Assets [Line Items]
Intangible asset acquired	$ 1,800
Intangible asset, amortization period	5 years
Forecast | Innovative Construction Group [Member]
Finite-Lived Intangible Assets [Line Items]
Payments for business acquisitions								$ 10,400	$ 10,400
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Retained Earnings
Finite-Lived Intangible Assets [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption (Deprecated 2020-01-31)										$ (700)

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