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Investment Securities Available For Sale (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | Investment securities available for sale consisted of the following as of December 31, 2017 and December 31, 2016 (dollar amounts in thousands):
| December 31, 2017 |  | December 31, 2016
| Amortized Cost |  | Unrealized |  | Fair Value |  | Amortized Cost |  | Unrealized |  | Fair Value
|  | Gains |  | Losses |  |  |  | Gains |  | Losses |
Agency RMBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency ARMs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Freddie Mac | $ | 33,623 |  |  | $ | 16 |  |  | $ | (852 | ) |  | $ | 32,787 |  |  | $ | 39,138 |  |  | $ | 24 |  |  | $ | (528 | ) |  | $ | 38,634 |
Fannie Mae | 54,958 |  |  | 6 |  |  | (1,236 | ) |  | 53,728 |  |  | 69,031 |  |  | 71 |  |  | (698 | ) |  | 68,404 |
Ginnie Mae | 4,750 |  |  | — |  |  | (193 | ) |  | 4,557 |  |  | 6,011 |  |  | — |  |  | (204 | ) |  | 5,807 |
Total Agency ARMs | 93,331 |  |  | 22 |  |  | (2,281 | ) |  | 91,072 |  |  | 114,180 |  |  | 95 |  |  | (1,430 | ) |  | 112,845 |
Agency Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Freddie Mac | 20,804 |  |  | — |  |  | (736 | ) |  | 20,068 |  |  | 26,338 |  |  | — |  |  | (644 | ) |  | 25,694 |
Fannie Mae | 1,038,363 |  |  | 669 |  |  | (12,174 | ) |  | 1,026,858 |  |  | 312,515 |  |  | — |  |  | (10,035 | ) |  | 302,480 |
Ginnie Mae | 365 |  |  | — |  |  | (6 | ) |  | 359 |  |  | 457 |  |  | — |  |  | (4 | ) |  | 453 |
Total Agency Fixed Rate | 1,059,532 |  |  | 669 |  |  | (12,916 | ) |  | 1,047,285 |  |  | 339,310 |  |  | — |  |  | (10,683 | ) |  | 328,627 |
Agency IOs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Freddie Mac | 8,436 |  |  | 19 |  |  | (2,756 | ) |  | 5,699 |  |  | 19,768 |  |  | 559 |  |  | (3,363 | ) |  | 16,964 |
Fannie Mae | 11,310 |  |  | 22 |  |  | (2,989 | ) |  | 8,343 |  |  | 27,597 |  |  | 478 |  |  | (4,777 | ) |  | 23,298 |
Ginnie Mae | 21,621 |  |  | 230 |  |  | (4,714 | ) |  | 17,137 |  |  | 49,788 |  |  | 1,223 |  |  | (6,382 | ) |  | 44,629 |
Total Agency IOs | 41,367 |  |  | 271 |  |  | (10,459 | ) |  | 31,179 |  |  | 97,153 |  |  | 2,260 |  |  | (14,522 | ) |  | 84,891 |
Total Agency RMBS | 1,194,230 |  |  | 962 |  |  | (25,656 | ) |  | 1,169,536 |  |  | 550,643 |  |  | 2,355 |  |  | (26,635 | ) |  | 526,363 |
Non-Agency RMBS | 100,291 |  |  | 1,852 |  |  | (18 | ) |  | 102,125 |  |  | 162,220 |  |  | 1,218 |  |  | (154 | ) |  | 163,284 |
U.S. Treasury securities | — |  |  | — |  |  | — |  |  | — |  |  | 2,920 |  |  | — |  |  | (33 | ) |  | 2,887 |
CMBS (1) | 123,203 |  |  | 18,217 |  |  | — |  |  | 141,420 |  |  | 113,955 |  |  | 12,876 |  |  | (389 | ) |  | 126,442 |
Total investment securities available for sale | $ | 1,417,724 |  |  | $ | 21,031 |  |  | $ | (25,674 | ) |  | $ | 1,413,081 |  |  | $ | 829,738 |  |  | $ | 16,449 |  |  | $ | (27,211 | ) |  | $ | 818,976 |
(1) | Included in CMBS is $47.9 million and $43.9 million of investment securities for sale held in securitization trusts as of December 31, 2017 and December 31, 2016, respectively.
Weighted Average Lives of Available-for-sale Securities | The following table sets forth the weighted average lives of our investment securities available for sale as of December 31, 2017 and December 31, 2016 (dollar amounts in thousands):
Weighted Average Life | December 31, 2017 |  | December 31, 2016
0 to 5 years | $ | 426,061 |  |  | $ | 606,079 |
Over 5 to 10 years | 970,336 |  |  | 177,765 |
10+ years | 16,684 |  |  | 35,132 |
Total | $ | 1,413,081 |  |  | $ | 818,976 |
Schedule of Stated Reset Periods for Available-for-sale Securities Held in Securitization Trusts | The following tables set forth the stated interest reset periods of our investment securities available for sale and investment securities available for sale held in securitization trusts at December 31, 2017 and December 31, 2016 at carrying value (dollar amounts in thousands):
| December 31, 2017 |  | December 31, 2016
| Less than 6 months |  | 6 to 24 months |  | More than 24 months |  | Total |  | Less than 6 months |  | 6 to 24 months |  | More than 24 months |  | Total
Agency RMBS | $ | 26,876 |  |  | $ | 24,726 |  |  | $ | 1,117,934 |  |  | $ | 1,169,536 |  |  | $ | 53,043 |  |  | $ | 27,272 |  |  | $ | 446,048 |  |  | $ | 526,363 |
Non-Agency RMBS | 84,461 |  |  | — |  |  | 17,664 |  |  | 102,125 |  |  | 50,080 |  |  | — |  |  | 113,204 |  |  | 163,284 |
U.S. Treasury securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,887 |  |  | 2,887 |
CMBS | 70,791 |  |  | — |  |  | 70,629 |  |  | 141,420 |  |  | 82,545 |  |  | — |  |  | 43,897 |  |  | 126,442 |
Total investment securities available for sale | $ | 182,128 |  |  | $ | 24,726 |  |  | $ | 1,206,227 |  |  | $ | 1,413,081 |  |  | $ | 185,668 |  |  | $ | 27,272 |  |  | $ | 606,036 |  |  | $ | 818,976 |
Investment Securities Available-for-sale in an Unrealized Loss Position | The following tables present the Company's investment securities available for sale in an unrealized loss position reported through OCI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2017 and December 31, 2016 (dollar amounts in thousands):
December 31, 2017 | Less than 12 Months |  | Greater than 12 months |  | Total
| Carrying Value |  | Gross Unrealized Losses |  | Carrying Value |  | Gross Unrealized Losses |  | Carrying Value |  | Gross Unrealized Losses
Agency RMBS | $ | 511,313 |  |  | $ | (1,807 | ) |  | $ | 342,963 |  |  | $ | (13,390 | ) |  | $ | 854,276 |  |  | $ | (15,197 | )
Non-Agency RMBS | — |  |  | — |  |  | 193 |  |  | (18 | ) |  | 193 |  |  | (18 | )
Total investment securities available for sale | $ | 511,313 |  |  | $ | (1,807 | ) |  | $ | 343,156 |  |  | $ | (13,408 | ) |  | $ | 854,469 |  |  | $ | (15,215 | )
December 31, 2016 | Less than 12 Months |  | Greater than 12 months |  | Total
| Carrying Value |  | Gross Unrealized Losses |  | Carrying Value |  | Gross Unrealized Losses |  | Carrying Value |  | Gross Unrealized Losses
Agency RMBS | $ | 96,357 |  |  | $ | (1,290 | ) |  | $ | 328,474 |  |  | $ | (10,819 | ) |  | $ | 424,831 |  |  | $ | (12,109 | )
Non-Agency RMBS | — |  |  | — |  |  | 596 |  |  | (154 | ) |  | 596 |  |  | (154 | )
CMBS | 16,523 |  |  | (389 | ) |  | — |  |  | — |  |  | 16,523 |  |  | (389 | )
Total investment securities available for sale | $ | 112,880 |  |  | $ | (1,679 | ) |  | $ | 329,070 |  |  | $ | (10,973 | ) |  | $ | 441,950 |  |  | $ | (12,652 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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