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Investments | 3 Months Ended
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Mar. 31, 2017
Investments [Abstract] |
Investments | Investments The amortized cost, gross unrealized gains and losses and fair value of the investment portfolio at March 31, 2017 and December 31, 2016 are shown below.
March 31, 2017
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses (1) |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 61,035 |  |  | $ | 387 |  |  | $ | (604 | ) |  | $ | 60,818 |
Obligations of U.S. states and political subdivisions |  | 2,161,765 |  |  | 25,893 |  |  | (19,208 | ) |  | 2,168,450 |
Corporate debt securities |  | 1,753,470 |  |  | 7,594 |  |  | (13,724 | ) |  | 1,747,340 |
ABS |  | 37,107 |  |  | 29 |  |  | (19 | ) |  | 37,117 |
RMBS |  | 220,739 |  |  | 93 |  |  | (7,923 | ) |  | 212,909 |
CMBS |  | 300,185 |  |  | 1,038 |  |  | (7,106 | ) |  | 294,117 |
CLOs |  | 121,156 |  |  | 380 |  |  | (168 | ) |  | 121,368 |
Total debt securities |  | 4,655,457 |  |  | 35,414 |  |  | (48,752 | ) |  | 4,642,119 |
Equity securities |  | 7,163 |  |  | 20 |  |  | (21 | ) |  | 7,162 |
Total investment portfolio |  | $ | 4,662,620 |  |  | $ | 35,434 |  |  | $ | (48,773 | ) |  | $ | 4,649,281 |
December 31, 2016
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses (1) |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 73,847 |  |  | $ | 407 |  |  | $ | (724 | ) |  | $ | 73,530 |
Obligations of U.S. states and political subdivisions |  | 2,147,458 |  |  | 20,983 |  |  | (25,425 | ) |  | 2,143,016 |
Corporate debt securities |  | 1,756,461 |  |  | 6,059 |  |  | (18,610 | ) |  | 1,743,910 |
ABS |  | 59,519 |  |  | 74 |  |  | (28 | ) |  | 59,565 |
RMBS |  | 231,733 |  |  | 102 |  |  | (7,626 | ) |  | 224,209 |
CMBS |  | 327,042 |  |  | 769 |  |  | (7,994 | ) |  | 319,817 |
CLOs |  | 121,151 |  |  | 226 |  |  | (202 | ) |  | 121,175 |
Total debt securities |  | 4,717,211 |  |  | 28,620 |  |  | (60,609 | ) |  | 4,685,222 |
Equity securities |  | 7,144 |  |  | 8 |  |  | (24 | ) |  | 7,128 |
Total investment portfolio |  | $ | 4,724,355 |  |  | $ | 28,628 |  |  | $ | (60,633 | ) |  | $ | 4,692,350 |
(1) | At March 31, 2017 and December 31, 2016, there were no other-than-temporary impairment losses recorded in other comprehensive income.
The FHLB Advance is secured by eligible collateral whose fair value must be maintained at 102% of the outstanding principal balance. As of March 31, 2017 that collateral is included in our total investment portfolio amount shown above with a total fair value of $165.0 million. The amortized cost and fair values of debt securities at March 31, 2017, by contractual maturity, are shown in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Because most asset-backed and mortgage-backed securities and collateralized loan obligations provide for periodic payments throughout their lives, they are listed in separate categories.
March 31, 2017 |  |  |  |
(In thousands) |  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 338,124 |  |  | $ | 338,309 |
Due after one year through five years |  | 1,318,577 |  |  | 1,323,558 |
Due after five years through ten years |  | 1,091,184 |  |  | 1,082,035 |
Due after ten years |  | 1,228,385 |  |  | 1,232,706 |
|  | $ | 3,976,270 |  |  | $ | 3,976,608 |
ABS |  | 37,107 |  |  | 37,117 |
RMBS |  | 220,739 |  |  | 212,909 |
CMBS |  | 300,185 |  |  | 294,117 |
CLOs |  | 121,156 |  |  | 121,368 |
Total as of March 31, 2017 |  | $ | 4,655,457 |  |  | $ | 4,642,119 |
At March 31, 2017 and December 31, 2016, the investment portfolio had gross unrealized losses of $48.8 million and $60.6 million, respectively. For those securities in an unrealized loss position, the length of time the securities were in such a position, as measured by their month-end fair values, is as follows:
March 31, 2017 |  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 51,602 |  |  | $ | (604 | ) |  | $ | — |  |  | $ | — |  |  | $ | 51,602 |  |  | $ | (604 | )
Obligations of U.S. states and political subdivisions |  | 830,978 |  |  | (18,391 | ) |  | 22,930 |  |  | (817 | ) |  | 853,908 |  |  | (19,208 | )
Corporate debt securities |  | 802,288 |  |  | (12,157 | ) |  | 34,552 |  |  | (1,567 | ) |  | 836,840 |  |  | (13,724 | )
ABS |  | 2,998 |  |  | (19 | ) |  | — |  |  | — |  |  | 2,998 |  |  | (19 | )
RMBS |  | 46,425 |  |  | (985 | ) |  | 162,729 |  |  | (6,938 | ) |  | 209,154 |  |  | (7,923 | )
CMBS |  | 165,771 |  |  | (6,994 | ) |  | 16,453 |  |  | (112 | ) |  | 182,224 |  |  | (7,106 | )
CLOs |  | 7,276 |  |  | (168 | ) |  | — |  |  | — |  |  | 7,276 |  |  | (168 | )
Equity securities |  | 527 |  |  | (12 | ) |  | 138 |  |  | (9 | ) |  | 665 |  |  | (21 | )
Total |  | $ | 1,907,865 |  |  | $ | (39,330 | ) |  | $ | 236,802 |  |  | $ | (9,443 | ) |  | $ | 2,144,667 |  |  | $ | (48,773 | )
December 31, 2016 |  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 48,642 |  |  | $ | (724 | ) |  | $ | — |  |  | $ | — |  |  | $ | 48,642 |  |  | $ | (724 | )
Obligations of U.S. states and political subdivisions |  | 1,136,676 |  |  | (24,918 | ) |  | 13,681 |  |  | (507 | ) |  | 1,150,357 |  |  | (25,425 | )
Corporate debt securities |  | 915,777 |  |  | (16,771 | ) |  | 35,769 |  |  | (1,839 | ) |  | 951,546 |  |  | (18,610 | )
ABS |  | 3,366 |  |  | (28 | ) |  | 656 |  |  | — |  |  | 4,022 |  |  | (28 | )
RMBS |  | 46,493 |  |  | (857 | ) |  | 171,326 |  |  | (6,769 | ) |  | 217,819 |  |  | (7,626 | )
CMBS |  | 205,545 |  |  | (7,529 | ) |  | 38,587 |  |  | (465 | ) |  | 244,132 |  |  | (7,994 | )
CLOs |  | 13,278 |  |  | (73 | ) |  | 34,760 |  |  | (129 | ) |  | 48,038 |  |  | (202 | )
Equity securities |  | 568 |  |  | (15 | ) |  | 137 |  |  | (9 | ) |  | 705 |  |  | (24 | )
Total |  | $ | 2,370,345 |  |  | $ | (50,915 | ) |  | $ | 294,916 |  |  | $ | (9,718 | ) |  | $ | 2,665,261 |  |  | $ | (60,633 | )
The unrealized losses in all categories of our investments at March 31, 2017 and December 31, 2016 were primarily caused by the difference in interest rates at each respective period, compared to interest rates at the time of purchase. There were 495 and 607 securities in an unrealized loss position at March 31, 2017 and December 31, 2016, respectively. During each of the three months ended March 31, 2017 and 2016 there were no other-than-temporary impairments (“OTTI”) recognized. The net realized investment (losses) gains on the investment portfolio are as follows:
|  | Three Months Ended March 31,
(In thousands) |  | 2017 |  | 2016
Realized investment (losses) gains on investments: |  |  |  |
Fixed maturities |  | $ | (125 | ) |  | $ | 3,054 |
Equity securities |  | 3 |  |  | 2 |
Net realized investment (losses) gains |  | $ | (122 | ) |  | $ | 3,056 |
|  | Three Months Ended March 31,
(In thousands) |  | 2017 |  | 2016
Realized investment (losses) gains on investments: |  |  |  |
Gains on sales |  | $ | 185 |  |  | $ | 4,104 |
Losses on sales |  | (307 | ) |  | (1,048 | )
Net realized investment (losses) gains |  | $ | (122 | ) |  | $ | 3,056 |

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