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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. 24, 2020	Jan. 31, 2021	Jan. 31, 2020	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2022	Dec. 31, 2020	Jan. 01, 2020
Finite-Lived Intangible Assets [Line Items]
Payments for business acquisitions								$ 10,400	$ 83,251
Goodwill impairment				$ 0		$ 0		0	20,190
Severance expense					$ 10,300
Customer deposits				823,545				823,545			$ 449,474
Contract asset insurance renewals				41,600				41,600			38,500
Residential mortgage loans available-for-sale fair value				601,408				601,408			564,979
Residential mortgage loans available-for-sale aggregate outstanding principal balance				586,400				586,400			539,100
Net gains from the sale of mortgages				58,400		$ 76,600		$ 192,600	$ 173,800
Variability in future cash flows of derivative instruments in days								60 days
Assets In-Scope Under Accounting Standards Codification 326				194,500				$ 194,500			176,200
Interest rate lock commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount				521,500				521,500			367,200
Forward contracts
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount				843,000				843,000			686,400
Whole loan commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount				$ 235,500				235,500			$ 169,600
Innovative Construction Group
Finite-Lived Intangible Assets [Line Items]
Consideration for business acquisition			$ 104,000
Payments for business acquisitions		$ 10,400	83,300
Goodwill			48,700
Goodwill impairment							$ 20,200	$ 61,500
Innovative Construction Group | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible asset acquired			27,800
Intangible asset, amortization period	7 years
Innovative Construction Group | Trade Name
Finite-Lived Intangible Assets [Line Items]
Intangible asset acquired			$ 1,800
Intangible asset, amortization period	5 years
Forecast | Innovative Construction Group
Finite-Lived Intangible Assets [Line Items]
Payments for business acquisitions										$ 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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-Subparagraph (a)(3)(iii)(03)

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