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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Offsetting of Financial Assets, Liabilities, and Collateral | The table below presents financial assets and liabilities that are subject to master netting arrangements or similar agreements categorized by financial instrument, together with corresponding financial instruments and corresponding collateral received or pledged at December 31, 2017 and December 31, 2016. Table 3.1 – Offsetting of Financial Assets, Liabilities, and Collateral
|  | Gross Amounts of Recognized Assets (Liabilities) |  | Gross Amounts Offset in Consolidated Balance Sheet |  | Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet |  | Gross Amounts Not Offset in Consolidated Balance Sheet (1) |  | Net Amount
December 31, 2017 (In Thousands) |  |  |  |  | Financial Instruments |  | Cash Collateral (Received) Pledged |
Assets (2) |  |  |  |  |  |  |  |  |  |  |  |
Interest rate agreements |  | $ | 10,164 |  |  | $ | — |  |  | $ | 10,164 |  |  | $ | (6,196 | ) |  | $ | (42 | ) |  | $ | 3,926 |
TBAs |  | 133 |  |  | — |  |  | 133 |  |  | (133 | ) |  | — |  |  | — |
Futures |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Total Assets |  | $ | 10,298 |  |  | $ | — |  |  | $ | 10,298 |  |  | $ | (6,329 | ) |  | $ | (42 | ) |  | $ | 3,927 |
Liabilities (2) |  |  |  |  |  |  |  |  |  |  |  |
Interest rate agreements |  | $ | (55,567 | ) |  | $ | — |  |  | $ | (55,567 | ) |  | $ | 6,196 |  |  | $ | 49,371 |  |  | $ | — |
TBAs |  | (3,808 | ) |  | — |  |  | (3,808 | ) |  | 133 |  |  | 1,376 |  |  | (2,299 | )
Loan warehouse debt |  | (1,039,666 | ) |  | — |  |  | (1,039,666 | ) |  | 1,039,666 |  |  | — |  |  | — |
Security repurchase agreements |  | (648,746 | ) |  | — |  |  | (648,746 | ) |  | 648,746 |  |  | — |  |  | — |
Total Liabilities |  | $ | (1,747,787 | ) |  | $ | — |  |  | $ | (1,747,787 | ) |  | $ | 1,694,741 |  |  | $ | 50,747 |  |  | $ | (2,299 | )
|  | Gross Amounts of Recognized Assets (Liabilities) |  | Gross Amounts Offset in Consolidated Balance Sheet |  | Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet |  | Gross Amounts Not Offset in Consolidated Balance Sheet (1) |  | Net Amount
December 31, 2016 (In Thousands) |  |  |  |  | Financial Instruments |  | Cash Collateral (Received) Pledged |
Assets (2) |  |  |  |  |  |  |  |  |  |  |  |
Interest rate agreements |  | $ | 24,980 |  |  | $ | — |  |  | $ | 24,980 |  |  | $ | (7,736 | ) |  | $ | (4,784 | ) |  | $ | 12,460 |
TBAs |  | 8,300 |  |  | — |  |  | 8,300 |  |  | (3,936 | ) |  | (4,364 | ) |  | — |
Total Assets |  | $ | 33,280 |  |  | $ | — |  |  | $ | 33,280 |  |  | $ | (11,672 | ) |  | $ | (9,148 | ) |  | $ | 12,460 |
Liabilities (2) |  |  |  |  |  |  |  |  |  |  |  |
Interest rate agreements |  | $ | (56,919 | ) |  | $ | — |  |  | $ | (56,919 | ) |  | $ | 7,736 |  |  | $ | 49,183 |  |  | $ | — |
TBAs |  | (4,681 | ) |  | — |  |  | (4,681 | ) |  | 3,936 |  |  | — |  |  | (745 | )
Futures |  | (928 | ) |  | — |  |  | (928 | ) |  | — |  |  | 928 |  |  | — |
Loan warehouse debt |  | (485,544 | ) |  | — |  |  | (485,544 | ) |  | 485,544 |  |  | — |  |  | — |
Security repurchase agreements |  | (305,995 | ) |  | — |  |  | (305,995 | ) |  | 305,995 |  |  | — |  |  | — |
Total Liabilities |  | $ | (854,067 | ) |  | $ | — |  |  | $ | (854,067 | ) |  | $ | 803,211 |  |  | $ | 50,111 |  |  | $ | (745 | )
(1) | Amounts presented in these columns are limited in total to the net amount of assets or liabilities presented in the prior column by instrument. In certain cases, there is excess cash collateral or financial assets we have pledged to a counterparty (which may, in certain circumstances, be a clearinghouse) that exceed the financial liabilities subject to a master netting arrangement or similar agreement. Additionally, in certain cases, counterparties may have pledged excess cash collateral to us that exceeds our corresponding financial assets. In each case, any of these excess amounts are excluded from the table although they are separately reported in our consolidated balance sheets as assets or liabilities, respectively.
(2) | Interest rate agreements, TBAs, credit default index swaps, and futures are components of derivatives instruments on our consolidated balance sheets. Loan warehouse debt, which is secured by residential mortgage loans, and security repurchase agreements are components of Short-term debt on our consolidated balance sheets.

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