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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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