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Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Estimated Fair Value | The amortized cost and estimated fair value of the Company’s securities at December 31, 2016 are summarized as follows:
Security Description | Face Amount |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value
CMBS (Fair Value Option) | 375,861 |  |  | 368,247 |  |  | 292 |  |  | (37,463 | ) |  | 331,076 |
CMBS (Held-to-Maturity) | 146,530 |  |  | 146,352 |  |  | — |  |  | — |  |  | 146,352 |
Total | $ | 522,391 |  |  | $ | 514,599 |  |  | $ | 292 |  |  | $ | (37,463 | ) |  | $ | 477,428 |
Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis | The overall statistics for the Company’s CMBS (Fair Value Option) calculated on a weighted average basis as of December 31, 2016. Statistics are not presented as of December 31, 2017 because the company did not hold any CMBS (Fair Value Option):
| December 31, 2016
Credit Ratings * | B+-NR |
Coupon | 5.9 | %
Yield | 6.0 | %
Weighted Average Life | 2.5 years |
* | Ratings per Fitch Ratings, Moody’s Investors Service or Standard & Poor's.
Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis | The percentage vintage, property type, and location of the collateral securing the Company’s CMBS (Fair Value Option) calculated on a weighted average basis as of December 31, 2016. These metrics are not presented as of December 31, 2017 because the company did not hold any CMBS (Fair Value Option):
Vintage | December 31, 2016
2005 | 2.0 | %
2006 | 12.1 |
2007 | 73.5 |
2008 | 12.4 |
Total | 100 | %
Property Type | December 31, 2016
Office | 34.6 | %
Retail | 29.0 |
Multifamily | 12.4 |
Other * | 24.0 |
Total | 100 | %
* | No other individual category comprises more than 10% of the total.
Location | December 31, 2016
South Atlantic | 23.8 | %
Middle Atlantic | 16.7 |
Pacific | 15.3 |
East North Central | 10.8 |
Other * | 33.4 |
Total | 100 | %
* | No other individual category comprises more than 10% of the total.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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