Debt and Equity Securities | Note 3 – Debt and Equity Securities I nvestments in debt securities, all of which are classified as available-for-sale, are as follows: (in thousands) Amortized cost Gross unrealized Estimated fair value Gains Losses June 30 , 2015 U.S. Treasury bonds $ 102,861 $ 569 $ ( 1,610 ) $ 101,820 Municipal bonds 669,164 8,886 ( 3,009 ) 675,041 Foreign bonds 189,499 3,002 ( 53 ) 192,448 Governmental agency bonds 419,150 1,004 ( 2,425 ) 417,729 Governmental agency mortgage-backed securities 2,016,851 6,986 ( 10,652 ) 2,013,185 Corporate debt securities 747,25 6 6,307 ( 8,372 ) 745,19 1 $ 4,144,78 1 $ 26,754 $ ( 26,121 ) $ 4,145,41 4 December 31, 2014 U.S. Treasury bonds $ 64,195 $ 968 $ (181 ) $ 64,982 Municipal bonds 577,703 10,981 (1,007 ) 587,677 Foreign bonds 194,749 2,009 (8 ) 196,750 Governmental agency bonds 198,330 1,562 (2,018 ) 197,874 Governmental agency mortgage-backed securities 1,812,766 8,491 (9,095 ) 1,812,162 Non-agency mortgage-backed securities 15,949 1,306 (717 ) 16,538 Corporate debt securities 568,774 8,759 (3,264 ) 574,269 $ 3,432,466 $ 34,076 $ (16,290 ) $ 3,450,252 I nvestments in equity securities, all of which are classified as available-for-sale, are as follows: Cost Gross unrealized Estimated fair value (in thousands) Gains Losses June 30 , 2015 Preferred stocks $ 19,578 $ 688 $ ( 1,225 ) $ 19,041 Common stocks 271,551 17,876 ( 4,387 ) 285,040 $ 291,129 $ 18,564 $ ( 5,612 ) $ 304,081 December 31, 2014 Preferred stocks $ 14,976 $ 596 $ (47 ) $ 15,525 Common stocks 378,938 16,680 (8,731 ) 386,887 $ 393,914 $ 17,276 $ (8,778 ) $ 402,412 Sales of debt and equity securities resulted in realized gains of $ 1.5 million and $ 8.0 million and realized losses of $ 0.4 million and $ 0.6 million for the three months ended June 30, 2015 and 2014, respectively, and realized gains of $ 5.1 million and $ 14.6 million and realized losses of $ 6.6 million and $ 4.3 million for the six months ended June 30, 2015 and 2014, respectively. G ross unrealized losses on investments in debt and equity securities are as follows : Less than 12 months 12 months or longer Total (in thousands) Estimated fair value Unrealized losses Estimated fair value Unrealized losses Estimated fair value Unrealized losses June 30 , 2015 Debt securities: U.S. Treasury bonds $ 56,754 $ ( 1,580 ) $ 11,012 $ ( 30 ) $ 67,766 $ ( 1,610 ) Municipal bonds 248,986 ( 2,807 ) 12,983 ( 202 ) 261,969 ( 3,009 ) Foreign bonds 7,713 ( 53 ) — — 7,713 ( 53 ) Governmental agency bonds 237,630 ( 2,005 ) 44,764 ( 420 ) 282,394 ( 2,425 ) Governmental agency mortgage-backed securities 797,995 ( 5,197 ) 179,534 ( 5,455 ) 977,529 ( 10,652 ) Corporate debt securities 312,517 ( 7,751 ) 17,861 ( 621 ) 330,378 ( 8,372 ) Total debt securities 1,661,595 ( 19,393 ) 266,154 ( 6,728 ) 1,927,749 ( 26,121 ) Equity securities 107,681 ( 3,833 ) 17,551 ( 1,779 ) 125,232 ( 5,612 ) Total $ 1,769,276 $ ( 23,226 ) $ 283,705 $ ( 8,507 ) $ 2,052,981 $ ( 31,733 ) December 31, 2014 Debt securities: U.S. Treasury bonds $ 8,122 $ (27 ) $ 15,124 $ (154 ) $ 23,246 $ (181 ) Municipal bonds 137,755 (689 ) 19,625 (318 ) 157,380 (1,007 ) Foreign bonds 6,215 (8 ) — — 6,215 (8 ) Governmental agency bonds 27,479 (88 ) 127,936 (1,930 ) 155,415 (2,018 ) Governmental agency mortgage-backed securities 383,717 (1,612 ) 300,918 (7,483 ) 684,635 (9,095 ) Non-agency mortgage-backed securities — — 5,611 (717 ) 5,611 (717 ) Corporate debt securities 198,079 (3,151 ) 9,683 (113 ) 207,762 (3,264 ) Total debt securities 761,367 (5,575 ) 478,897 (10,715 ) 1,240,264 (16,290 ) Equity securities 208,922 (8,587 ) 2,340 (191 ) 211,262 (8,778 ) Total $ 970,289 $ (14,162 ) $ 481,237 $ (10,906 ) $ 1,451,526 $ (25,068 ) Investments in debt securities at June 30 , 2015, by contractual maturities, are as follows: (in thousands) Due in one year or less Due after one through five years Due after five through ten years Due after ten years Total U.S. Treasury bonds Amortized cost $ 3,680 $ 69,082 $ 13,615 $ 16,484 $ 102,861 Estimated fair value $ 3,738 $ 69,157 $ 13,512 $ 15,413 $ 101,820 Municipal bonds Amortized cost $ 37,237 $ 278,179 $ 220,717 $ 133,031 $ 669,164 Estimated fair value $ 37,389 $ 280,146 $ 223,300 $ 134,206 $ 675,041 Foreign bonds Amortized cost $ 48,442 $ 126,251 $ 11,652 $ 3,154 $ 189,499 Estimated fair value $ 48,788 $ 128,657 $ 11,834 $ 3,169 $ 192,448 Governmental agency bonds Amortized cost $ 12,293 $ 354,761 $ 28,247 $ 23,849 $ 419,150 Estimated fair value $ 12,312 $ 353,776 $ 28,418 $ 23,223 $ 417,729 Corporate debt securities Amortized cost $ 19,668 $ 289,397 $ 370,973 $ 67,218 $ 747,256 Estimated fair value $ 19,900 $ 292,130 $ 368,710 $ 64,451 $ 745,191 Total debt securities excluding mortgage-backed securities Amortized cost $ 121,320 $ 1,117,670 $ 645,204 $ 243,736 $ 2,127,930 Estimated fair value $ 122,127 $ 1,123,866 $ 645,774 $ 240,462 $ 2,132,229 Total mortgage-backed securities Amortized cost $ 2,016,851 Estimated fair value $ 2,013,185 Total debt securities Amortized cost $ 4,144,781 Estimated fair value $ 4,145,414 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 such obligations with or without call or prepayment penalties. |