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Real Estate Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Fair Values of Real Estate Securities | The following table presents the fair values of our real estate securities by type at June 30, 2015 and December 31, 2014.
(In Thousands) |  | June 30, 2015 |  | December 31, 2014
Trading |  | $ | 116,141 |  |  | $ | 111,606 |
Available-for-sale |  | 1,041,458 |  |  | 1,267,624 |
Total Real Estate Securities |  | $ | 1,157,599 |  |  | $ | 1,379,230 |
Trading Securities by Collateral Type | The following table presents trading securities by collateral type at June 30, 2015 and December 31, 2014.
(In Thousands) |  | June 30, 2015 |  | December 31, 2014
Senior Securities |  |  |  |
Prime |  | $ | 62,427 |  |  | $ | 93,802 |
Non-prime |  | 6,705 |  |  | 7,951 |
Total Senior Securities |  | 69,132 |  |  | 101,753 |
Prime Subordinate Securities |  | 47,009 |  |  | 9,853 |
Total Trading Securities |  | $ | 116,141 |  |  | $ | 111,606 |
Available for Sale Securities by Collateral Type | The following table presents the fair value of our available-for-sale securities held at Redwood by collateral type at June 30, 2015 and December 31, 2014.
(In Thousands) |  | June 30, 2015 |  | December 31, 2014
Senior Securities |  |  |  |
Prime |  | $ | 278,960 |  |  | $ | 307,813 |
Non-prime |  | 166,376 |  |  | 179,744 |
Total Senior Securities |  | 445,336 |  |  | 487,557 |
Re-REMIC Securities |  | 169,084 |  |  | 168,347 |
Subordinate Securities |  |  |  |
Prime Mezzanine (1) |  | 257,263 |  |  | 448,838 |
Subordinate (2) |  | 169,775 |  |  | 162,882 |
Total Subordinate Securities |  | 427,038 |  |  | 611,720 |
Total AFS Securities |  | $ | 1,041,458 |  |  | $ | 1,267,624 |
(1) Mezzanine includes securities initially rated AA, A and BBB- and issued in 2012 or later. (2) Subordinate securities includes less than $1 million of non-prime securities at both June 30, 2015, and December 31, 2014.
Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities | The following table presents the components of carrying value (which equals fair value) of AFS securities at June 30, 2015 and December 31, 2014. Carrying Value of AFS Securities
June 30, 2015 |  | Senior |  |  |  |  |  |
(In Thousands) |  | Prime |  | Non-prime |  | Re-REMIC |  | Subordinate |  | Total
Principal balance |  | $ | 282,921 |  |  | $ | 182,719 |  |  | $ | 193,221 |  |  | $ | 535,511 |  |  | $ | 1,194,372 |
Credit reserve |  | (2,650 | ) |  | (9,175 | ) |  | (13,071 | ) |  | (36,804 | ) |  | (61,700 | )
Unamortized discount, net |  | (30,401 | ) |  | (27,533 | ) |  | (75,658 | ) |  | (139,527 | ) |  | (273,119 | )
Amortized cost |  | 249,870 |  |  | 146,011 |  |  | 104,492 |  |  | 359,180 |  |  | 859,553 |
Gross unrealized gains |  | 31,196 |  |  | 20,550 |  |  | 64,592 |  |  | 68,519 |  |  | 184,857 |
Gross unrealized losses |  | (2,106 | ) |  | (185 | ) |  | — |  |  | (661 | ) |  | (2,952 | )
Carrying Value |  | $ | 278,960 |  |  | $ | 166,376 |  |  | $ | 169,084 |  |  | $ | 427,038 |  |  | $ | 1,041,458 |
December 31, 2014 |  | Senior |  |  |  |  |  |
(In Thousands) |  | Prime |  | Non-prime |  | Re-REMIC |  | Subordinate |  | Total
Principal balance |  | $ | 311,573 |  |  | $ | 196,258 |  |  | $ | 195,098 |  |  | $ | 742,150 |  |  | $ | 1,445,079 |
Credit reserve |  | (3,660 | ) |  | (9,644 | ) |  | (15,202 | ) |  | (41,561 | ) |  | (70,067 | )
Unamortized discount, net |  | (34,782 | ) |  | (31,491 | ) |  | (79,611 | ) |  | (150,458 | ) |  | (296,342 | )
Amortized cost |  | 273,131 |  |  | 155,123 |  |  | 100,285 |  |  | 550,131 |  |  | 1,078,670 |
Gross unrealized gains |  | 35,980 |  |  | 24,682 |  |  | 68,062 |  |  | 63,026 |  |  | 191,750 |
Gross unrealized losses |  | (1,298 | ) |  | (61 | ) |  | — |  |  | (1,437 | ) |  | (2,796 | )
Carrying Value |  | $ | 307,813 |  |  | $ | 179,744 |  |  | $ | 168,347 |  |  | $ | 611,720 |  |  | $ | 1,267,624 |
Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities | The following table presents the changes for the three and six months ended June 30, 2015, in unamortized discount and designated credit reserves on residential AFS securities. Changes in Unamortized Discount and Designated Credit Reserves on AFS Securities
|  | Three Months Ended June 30, 2015 |  | Six Months Ended June 30, 2015
|  | Credit Reserve |  | Unamortized Discount, Net |  | Credit Reserve |  | Unamortized Discount, Net
(In Thousands) |  |  |  |
Beginning balance |  | $ | 63,584 |  |  | $ | 286,382 |  |  | $ | 70,067 |  |  | $ | 296,342 |
Amortization of net discount |  | — |  |  | (9,324 | ) |  | — |  |  | (19,162 | )
Realized credit losses |  | (2,769 | ) |  | — |  |  | (5,714 | ) |  | — |
Acquisitions |  | 858 |  |  | 3,033 |  |  | 858 |  |  | 5,705 |
Sales, calls, other |  | — |  |  | (6,945 | ) |  | — |  |  | (13,277 | )
Impairments |  | — |  |  | — |  |  | — |  |  | — |
Transfers to (release of) credit reserves, net |  | 27 |  |  | (27 | ) |  | (3,511 | ) |  | 3,511 |
Ending Balance |  | $ | 61,700 |  |  | $ | 273,119 |  |  | $ | 61,700 |  |  | $ | 273,119 |
Components of Carrying Value of Available for Sale Securities in Unrealized Loss Position | The following table presents the components comprising the total carrying value of residential AFS securities that were in a gross unrealized loss position at June 30, 2015 and December 31, 2014.
|  | Less Than 12 Consecutive Months |  | 12 Consecutive Months or Longer
|  | Amortized Cost |  | Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Unrealized Losses |  | Fair Value
(In Thousands) |  |  |  |  |  |
June 30, 2015 |  | $ | 98,390 |  |  | $ | (1,263 | ) |  | $ | 97,127 |  |  | $ | 74,537 |  |  | $ | (1,689 | ) |  | $ | 72,848 |
December 31, 2014 |  | 126,681 |  |  | (1,374 | ) |  | 125,307 |  |  | 70,676 |  |  | (1,422 | ) |  | 69,254 |
Summary of Significant Valuation Assumptions for Available for Sale Securities | The table below summarizes the significant valuation assumptions we used for our AFS securities in unrealized loss positions at June 30, 2015. Significant Valuation Assumptions
|  | Range for Securities |
June 30, 2015 |  | Prime |  |  | Non-prime |
Prepayment rates |  | 8 - 16 | % |  | 8 - 12 | %
Projected losses |  | 1 - 21 | % |  | 14 - 18 | %
Activity of Credit Component of Other-than-Temporary Impairments | The following table details the activity related to the credit loss component of OTTI (i.e., OTTI recognized through earnings) for AFS securities held at June 30, 2015 and 2014, for which a portion of an OTTI was recognized in other comprehensive income. Activity of the Credit Component of Other-than-Temporary Impairments
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In Thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Balance at beginning of period |  | $ | 32,949 |  |  | $ | 35,786 |  |  | $ | 33,849 |  |  | $ | 37,149 |
Additions |  |  |  |  |  |  |  |
Initial credit impairments |  | — |  |  | 190 |  |  | — |  |  | 261 |
Subsequent credit impairments |  | — |  |  | 28 |  |  | — |  |  | 70 |
Reductions |  |  |  |  |  |  |  |
Securities sold, or expected to sell |  | (253 | ) |  | (904 | ) |  | (348 | ) |  | (904 | )
Securities with no outstanding principal at period end |  | — |  |  | (844 | ) |  | (805 | ) |  | (2,320 | )
Balance at End of Period |  | $ | 32,696 |  |  | $ | 34,256 |  |  | $ | 32,696 |  |  | $ | 34,256 |
Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities | The following table presents the gross realized gains and losses on sales and calls of AFS securities for the three and six months ended June 30, 2015 and 2014.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In Thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Gross realized gains - sales |  | $ | 5,956 |  |  | $ | 992 |  |  | $ | 10,262 |  |  | $ | 992 |
Gross realized gains - calls |  | 360 |  |  | — |  |  | 360 |  |  | 987 |
Gross realized losses - sales |  | — |  |  | — |  |  | — |  |  | — |
Gross realized losses - calls |  | — |  |  | — |  |  | — |  |  | — |
Total Realized Gains on Sales and Calls of AFS Securities, net |  | $ | 6,316 |  |  | $ | 992 |  |  | $ | 10,622 |  |  | $ | 1,979 |

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