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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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