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Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Customer deposits |  | $ 342,376 |  | $ 342,376 |  | $ 250,779
Gain (loss) on land sale gains, net |  | 28,900 |  |  |  |
contract asset insurance renewals | $ 27,700 | 30,400 |  | 30,400 |  |
Residential mortgage loans available-for-sale fair value |  | 349,784 |  | 349,784 |  | 570,600
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  | 341,800 |  | 341,800 |  | 553,500
Changes in fair value, gain (loss) |  | (700) | $ 700 | (1,000) | $ (3,400) |
Net gains from the sale of mortgages |  | 27,800 | $ 27,100 | $ 83,900 | 80,100 |
Variability in future cash flows of derivative instruments in days |  |  |  | 60 days |  |
Cumulative effect of accounting change (see Note 1) |  |  |  | $ 22,411 | 18,237 |
Interest rate lock commitments |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | 434,900 |  | 434,900 |  | 210,900
Forward contracts |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | 579,000 |  | 579,000 |  | 522,000
Whole loan commitments |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | $ 171,400 |  | $ 171,400 |  | $ 203,100
Retained Earnings |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cumulative effect of accounting change (see Note 1) | $ 22,411 |  |  |  | $ 18,643 |

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