Debt and Equity Securities | Note 3 – Debt and Equity Securities Investments in debt securities, classified as available-for-sale, are as follows: (in thousands) Amortized Gross unrealized Estimated Gains Losses September 30, 2016 U.S. Treasury bonds $ 148,808 $ 2,089 $ (463 ) $ 150,434 Municipal bonds 906,895 19,565 (2,223 ) 924,237 Foreign government bonds 143,853 1,847 (342 ) 145,358 Governmental agency bonds 192,430 2,870 (123 ) 195,177 Governmental agency mortgage-backed securities 2,229,651 12,309 (6,163 ) 2,235,797 U.S. corporate debt securities 674,651 17,722 (1,635 ) 690,738 Foreign corporate debt securities 245,227 5,665 (463 ) 250,429 $ 4,541,515 $ 62,067 $ (11,412 ) $ 4,592,170 December 31, 2015 U.S. Treasury bonds $ 130,252 $ 421 $ (1,301 ) $ 129,372 Municipal bonds 692,000 12,640 (845 ) 703,795 Foreign government bonds 129,984 1,132 (1,015 ) 130,101 Governmental agency bonds 419,869 1,023 (2,801 ) 418,091 Governmental agency mortgage-backed securities 2,065,728 4,984 (15,039 ) 2,055,673 U.S. corporate debt securities 642,869 4,297 (12,483 ) 634,683 Foreign corporate debt securities 210,162 1,248 (3,778 ) 207,632 $ 4,290,864 $ 25,745 $ (37,262 ) $ 4,279,347 Investments in equity securities, classified as available-for-sale, are as follows: Cost Gross unrealized Estimated (in thousands) Gains Losses September 30, 2016 Preferred stocks $ 19,311 $ — $ (4,092 ) $ 15,219 Common stocks 351,841 24,742 (3,881 ) 372,702 $ 371,152 $ 24,742 $ (7,973 ) $ 387,921 December 31, 2015 Preferred stocks $ 18,305 $ 420 $ (3,258 ) $ 15,467 Common stocks 307,429 13,103 (14,714 ) 305,818 $ 325,734 $ 13,523 $ (17,972 ) $ 321,285 Sales of debt and equity securities resulted in realized gains of $8.9 million and $1.3 million and realized losses of $0.2 million and $1.6 million for the three months ended September 30, 2016 and 2015, respectively, and realized gains of $22.1 million and $6.5 million and realized losses of $7.2 million and $8.2 million for the nine months ended September 30, 2016 and 2015, respectively. Gross unrealized losses on investments in debt and equity securities are as follows: Less than 12 months 12 months or longer Total (in thousands) Estimated Unrealized Estimated Unrealized Estimated Unrealized September 30, 2016 Debt securities: U.S. Treasury bonds $ 55,705 $ (463 ) $ — $ — $ 55,705 $ (463 ) Municipal bonds 223,714 (1,941 ) 16,401 (282 ) 240,115 (2,223 ) Foreign government bonds 32,714 (313 ) 363 (29 ) 33,077 (342 ) Governmental agency bonds 5,706 (123 ) — — 5,706 (123 ) Governmental agency mortgage-backed 749,900 (2,654 ) 339,896 (3,509 ) 1,089,796 (6,163 ) U.S. corporate debt securities 50,855 (634 ) 30,740 (1,001 ) 81,595 (1,635 ) Foreign corporate debt securities 21,121 (181 ) 9,990 (282 ) 31,111 (463 ) Total debt securities 1,139,715 (6,309 ) 397,390 (5,103 ) 1,537,105 (11,412 ) Equity securities 7,716 (74 ) 76,717 (7,899 ) 84,433 (7,973 ) Total $ 1,147,431 $ (6,383 ) $ 474,107 $ (13,002 ) $ 1,621,538 $ (19,385 ) December 31, 2015 Debt securities: U.S. Treasury bonds $ 105,701 $ (1,285 ) $ 1,654 $ (16 ) $ 107,355 $ (1,301 ) Municipal bonds 133,465 (733 ) 13,190 (112 ) 146,655 (845 ) Foreign government bonds 13,601 (890 ) 267 (125 ) 13,868 (1,015 ) Governmental agency bonds 191,035 (2,497 ) 18,237 (304 ) 209,272 (2,801 ) Governmental agency mortgage-backed 1,096,301 (9,424 ) 213,020 (5,615 ) 1,309,321 (15,039 ) U.S. corporate debt securities 361,842 (11,272 ) 13,511 (1,211 ) 375,353 (12,483 ) Foreign corporate debt securities 102,801 (2,725 ) 11,246 (1,053 ) 114,047 (3,778 ) Total debt securities 2,004,746 (28,826 ) 271,125 (8,436 ) 2,275,871 (37,262 ) Equity securities 191,248 (12,068 ) 31,974 (5,904 ) 223,222 (17,972 ) Total $ 2,195,994 $ (40,894 ) $ 303,099 $ (14,340 ) $ 2,499,093 $ (55,234 ) Investments in debt securities at September 30, 2016, by contractual maturities, are as follows: (in thousands) Due in one Due after Due after Due after Total U.S. Treasury bonds Amortized cost $ 35,270 $ 68,799 $ 16,147 $ 28,592 $ 148,808 Estimated fair value $ 35,293 $ 69,127 $ 16,660 $ 29,354 $ 150,434 Municipal bonds Amortized cost $ 47,544 $ 331,550 $ 214,529 $ 313,272 $ 906,895 Estimated fair value $ 47,615 $ 337,258 $ 221,613 $ 317,751 $ 924,237 Foreign government bonds Amortized cost $ 4,447 $ 107,304 $ 11,240 $ 20,862 $ 143,853 Estimated fair value $ 4,482 $ 108,323 $ 11,702 $ 20,851 $ 145,358 Governmental agency bonds Amortized cost $ 20,771 $ 82,989 $ 47,203 $ 41,467 $ 192,430 Estimated fair value $ 20,781 $ 83,238 $ 47,561 $ 43,597 $ 195,177 U.S. corporate debt securities Amortized cost $ 15,513 $ 318,116 $ 274,598 $ 66,424 $ 674,651 Estimated fair value $ 15,578 $ 324,386 $ 281,216 $ 69,558 $ 690,738 Foreign corporate debt securities Amortized cost $ 9,521 $ 114,704 $ 110,180 $ 10,822 $ 245,227 Estimated fair value $ 9,532 $ 116,436 $ 112,776 $ 11,685 $ 250,429 Total debt securities excluding mortgage-backed securities Amortized cost $ 133,066 $ 1,023,462 $ 673,897 $ 481,439 $ 2,311,864 Estimated fair value $ 133,281 $ 1,038,768 $ 691,528 $ 492,796 $ 2,356,373 Total mortgage-backed securities Amortized cost $ 2,229,651 Estimated fair value $ 2,235,797 Total debt securities Amortized cost $ 4,541,515 Estimated fair value $ 4,592,170 Mortgage-backed securities, which include contractual terms to maturity, are not categorized by contractual maturity because borrowers may have the right to call or prepay obligations with, or without, call or prepayment penalties. The composition of the investment portfolio at September 30, 2016, by credit rating, is as follows: A- Ratings or higher BBB+ to BBB- Ratings Non-Investment Grade Total (in thousands, except percentages) Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage September 30, 2016 Debt securities: U.S. Treasury bonds $ 150,434 100.0 $ — — $ — — $ 150,434 100.0 Municipal bonds 879,726 95.2 35,861 3.8 8,650 1.0 924,237 100.0 Foreign government bonds 121,153 83.4 22,003 15.1 2,202 1.5 145,358 100.0 Governmental agency bonds 195,177 100.0 — — — — 195,177 100.0 Governmental agency mortgage- 2,235,797 100.0 — — — — 2,235,797 100.0 U.S. corporate debt securities 237,952 34.5 222,588 32.2 230,198 33.3 690,738 100.0 Foreign corporate debt securities 114,882 45.9 87,352 34.9 48,195 19.2 250,429 100.0 Total debt securities 3,935,121 85.7 367,804 8.0 289,245 6.3 4,592,170 100.0 Preferred stocks — — 8,987 59.1 6,232 40.9 15,219 100.0 Total $ 3,935,121 85.4 $ 376,791 8.2 $ 295,477 6.4 $ 4,607,389 100.0 As of September 30, 2016, the estimated fair value of total debt securities included $153.3 million of bank loans, of which $141.8 million was non-investment grade; $128.1 million of high yield corporate debt securities, all of which was non-investment grade; and $68.8 million of emerging market debt securities, of which $10.7 million was non-investment grade. The composition of the investment portfolio in an unrealized loss position at September 30, 2016, by credit rating, is as follows: A- Ratings or higher BBB+ to BBB- Ratings Non-Investment Grade Total (in thousands, except percentages) Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage September 30, 2016 Debt securities: U.S. Treasury bonds $ 55,705 100.0 $ — — $ — — $ 55,705 100.0 Municipal bonds 233,406 97.2 5,332 2.2 1,377 0.6 240,115 100.0 Foreign government bonds 19,904 60.1 12,197 36.9 976 3.0 33,077 100.0 Governmental agency bonds 5,706 100.0 — — — — 5,706 100.0 Governmental agency mortgage- 1,089,796 100.0 — — — — 1,089,796 100.0 U.S. corporate debt securities 7,342 9.0 29,664 36.4 44,589 54.6 81,595 100.0 Foreign corporate debt securities 3,004 9.7 15,461 49.7 12,646 40.6 31,111 100.0 Total debt securities 1,414,863 92.0 62,654 4.1 59,588 3.9 1,537,105 100.0 Preferred stocks — — 8,987 59.1 6,232 40.9 15,219 100.0 Total $ 1,414,863 91.2 $ 71,641 4.6 $ 65,820 4.2 $ 1,552,324 100.0 As of September 30, 2016, the estimated fair value of total debt securities in an unrealized loss position included $18.1 million of bank loans, of which $18.0 million was non-investment grade; $36.3 million of high yield corporate debt securities, all of which was non-investment grade; and $17.6 million of emerging market debt securities, of which $3.9 million was non-investment grade. The credit ratings in the above tables reflect published ratings obtained from Standard & Poor’s Rating Services, DBRS, Inc., Fitch Ratings, Inc. and Moody’s Investor Services, Inc. If a security was rated differently among the rating agencies, the lowest rating was selected. Governmental agency mortgage-backed securities are not rated by any of the ratings agencies; however, these securities have been included in the above table in the A- Ratings or higher category because the payments of principal and interest are guaranteed by the governmental agency that issued the security. |