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Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Customer deposits | $ 354,968 |  | $ 354,968 |  |  | $ 250,779
Gain (loss) on land sale gains, net | 27,300 |  |  |  |  |
contract asset insurance renewals | 29,800 |  | 29,800 |  | $ 27,700 |
Residential mortgage loans available-for-sale fair value | 369,634 |  | 369,634 |  |  | 570,600
Residential mortgage loans available-for-sale aggregate outstanding principal balance | 359,200 |  | 359,200 |  |  | 553,500
Changes in fair value, gain (loss) | (200) | $ (2,200) | (300) | $ (4,100) |  |
Net gains from the sale of mortgages | 29,200 | $ 27,700 | $ 56,200 | 52,900 |  |
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 | 426,500 |  | 426,500 |  |  | 210,900
Forward contracts |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Derivative, notional amount | 568,000 |  | 568,000 |  |  | 522,000
Whole loan commitments |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 186,700 |  | 186,700 |  |  | $ 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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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Gain (loss) on Land Sale gains, Net + References No definition available. + Details
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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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