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Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises - Schedule of Company Lines Available and Borrowings Outstanding (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jan. 29, 2019
Securities Financing Transaction [Line Items] |  |  |  |  |
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises | $ 793,194 |  | $ 972,387 |  |
Committed Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | 1,350,000 |  | 1,650,000 |  |
Uncommitted Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | 525,000 |  | 325,000 |  |
Warehouse Facility Due June 17, 2020 [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises | $ 120,945 |  |  |  |
Warehouse Facility Due June 17, 2020 [Member] | One Month LIBOR [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Stated Spread to One Month LIBOR | 1.15% |  |  |  |
Warehouse Facility Due June 17, 2020 [Member] | Committed Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | $ 450,000 |  |  |  |
Warehouse Facility Due June 17, 2020 [Member] | One Month LIBOR [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Stated Spread to One Month LIBOR | 1.10% |  |  |  |
Warehouse Facility Due June 17, 2020 [Member] | Uncommitted Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | $ 200,000 |  |  |  |
Warehouse Facility Due September 25, 2019 [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises | $ 189,749 |  | $ 113,452 |  |
Warehouse Facility Due September 25, 2019 [Member] | One Month LIBOR [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Stated Spread to One Month LIBOR | 1.15% |  | 1.20% |  |
Warehouse Facility Due September 25, 2019 [Member] | Committed Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | $ 200,000 |  | $ 200,000 |  |
Warehouse Facility Due October 10, 2019 [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available |  |  |  |  | $ 1,000,000
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises | $ 433,854 | [1] | $ 416,373 | [2] |
Warehouse Facility Due October 10, 2019 [Member] | One Month LIBOR [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Stated Spread to One Month LIBOR | 1.15% | [1] | 1.20% | [2] |
Warehouse Facility Due October 10, 2019 [Member] | Committed Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | $ 700,000 | [1] | $ 1,000,000 | [2] |
Fannie Mae Repurchase Agreement, Open Maturity [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises | $ 48,646 |  | $ 29,499 |  |
Fannie Mae Repurchase Agreement, Open Maturity [Member] | One Month LIBOR [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Stated Spread to One Month LIBOR | 1.05% |  | 1.15% |  |
Fannie Mae Repurchase Agreement, Open Maturity [Member] | Uncommitted Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available | $ 325,000 |  | $ 325,000 |  |
Warehouse Facility Due June 19, 2019 [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises |  |  | $ 413,063 |  |
Warehouse Facility Due June 19, 2019 [Member] | One Month LIBOR [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Stated Spread to One Month LIBOR |  |  | 1.20% |  |
Warehouse Facility Due June 19, 2019 [Member] | Committed Lines [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Lines available |  |  | $ 450,000 |  |
[1] | The warehouse facility was temporarily increased by $400.0 million to $700.0 million for the period of May 16, 2019 to July 15, 2019. The warehouse facility was temporarily increased by $200.0 million to $500.0 million for the period of July 15, 2019 to August 28, 2019. The warehouse facility was temporarily increased by an additional $1.3 billion to $1.8 billion for the period no longer than July 16, 2019 to September 13, 2019.
[2] | The warehouse facility was temporarily increased by $700.0 million to $1.0 billion for the period of November 30, 2018 to January 29, 2019. On January 29, 2019, the temporary increase was decreased by $400 million to $300 million for the period January 29, 2019 to April 1, 2019.

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