Debt and Equity Securities | NOTE 3. Debt and Equity Securities: Investments in debt securities, classified as available-for-sale, are as follows: Amortized Gross unrealized Estimated (in thousands) gains losses December 31, 2019 U.S. Treasury bonds $ 143,825 $ 469 $ (353 ) $ 143,941 Municipal bonds 1,043,252 47,804 (217 ) 1,090,839 Foreign government bonds 179,554 1,497 (961 ) 180,090 Governmental agency bonds 316,318 5,820 (219 ) 321,919 Governmental agency mortgage-backed securities 3,241,966 43,599 (7,307 ) 3,278,258 U.S. corporate debt securities 535,878 18,466 (972 ) 553,372 Foreign corporate debt securities 335,962 9,468 (213 ) 345,217 $ 5,796,755 $ 127,123 $ (10,242 ) $ 5,913,636 December 31, 2018 U.S. Treasury bonds $ 162,904 $ 741 $ (1,139 ) $ 162,506 Municipal bonds 1,050,134 7,210 (12,309 ) 1,045,035 Foreign government bonds 158,885 571 (2,159 ) 157,297 Governmental agency bonds 319,115 1,145 (4,093 ) 316,167 Governmental agency mortgage-backed securities 3,219,585 12,030 (29,016 ) 3,202,599 U.S. corporate debt securities 575,646 1,113 (15,499 ) 561,260 Foreign corporate debt securities 274,881 551 (6,485 ) 268,947 $ 5,761,150 $ 23,361 $ (70,700 ) $ 5,713,811 Sales of debt securities resulted in realized gains of $12.1 million, $3.3 million and $5.4 million, realized losses of $6.1 million, $20.3 million and $16.4 million, and proceeds of $1.1 billion, $1.3 billion and $821.0 million for the years ended December 31, 2019, 2018 and 2017, respectively. Gross unrealized losses on investments in debt securities are as follows: Less than 12 months 12 months or longer Total (in thousands) Estimated Unrealized Estimated Unrealized Estimated Unrealized December 31, 2019 U.S. Treasury bonds $ 12,507 $ (350 ) $ 3,193 $ (3 ) $ 15,700 $ (353 ) Municipal bonds 29,333 (207 ) 2,827 (10 ) 32,160 (217 ) Foreign government bonds 112,167 (934 ) 11,001 (27 ) 123,168 (961 ) Governmental agency bonds 24,493 (142 ) 14,923 (77 ) 39,416 (219 ) Governmental agency mortgage-backed securities 719,602 (2,785 ) 637,009 (4,522 ) 1,356,611 (7,307 ) U.S. corporate debt securities 42,607 (451 ) 10,216 (521 ) 52,823 (972 ) Foreign corporate debt securities 30,895 (108 ) 12,373 (105 ) 43,268 (213 ) $ 971,604 $ (4,977 ) $ 691,542 $ (5,265 ) $ 1,663,146 $ (10,242 ) December 31, 2018 U.S. Treasury bonds $ 19,749 $ (85 ) $ 55,615 $ (1,054 ) $ 75,364 $ (1,139 ) Municipal bonds 172,387 (1,772 ) 369,139 (10,537 ) 541,526 (12,309 ) Foreign government bonds 23,654 (1,037 ) 42,119 (1,122 ) 65,773 (2,159 ) Governmental agency bonds 56,270 (748 ) 90,631 (3,345 ) 146,901 (4,093 ) Governmental agency mortgage-backed securities 850,459 (6,955 ) 982,610 (22,061 ) 1,833,069 (29,016 ) U.S. corporate debt securities 374,473 (10,537 ) 109,844 (4,962 ) 484,317 (15,499 ) Foreign corporate debt securities 175,762 (4,575 ) 50,802 (1,910 ) 226,564 (6,485 ) $ 1,672,754 $ (25,709 ) $ 1,700,760 $ (44,991 ) $ 3,373,514 $ (70,700 ) Based on the Company’s review of its debt securities in an unrealized loss position at December 31, 2019, it determined that the losses were primarily the result of changes in interest rates, which were considered to be temporary, rather than a deterioration in credit quality. The Company does not intend to sell and it is not more likely than not that the Company will be required to sell these securities prior to recovering their amortized cost. As such, the Company does not consider these securities to be other-than-temporarily impaired at December 31, 2019. Investments in debt securities at December 31, 2019, by contractual maturities, are as follows: (in thousands) Due in one Due after Due after Due after Total U.S. Treasury bonds Amortized cost $ 76,677 $ 61,690 $ 1,025 $ 4,433 $ 143,825 Estimated fair value $ 76,735 $ 62,050 $ 1,070 $ 4,086 $ 143,941 Municipal bonds Amortized cost $ 74,228 $ 153,668 $ 304,195 $ 511,161 $ 1,043,252 Estimated fair value $ 74,595 $ 156,412 $ 319,179 $ 540,653 $ 1,090,839 Foreign government bonds Amortized cost $ 25,682 $ 75,702 $ 63,304 $ 14,866 $ 179,554 Estimated fair value $ 25,634 $ 75,872 $ 63,155 $ 15,429 $ 180,090 Governmental agency bonds Amortized cost $ 9,181 $ 102,604 $ 138,955 $ 65,578 $ 316,318 Estimated fair value $ 9,209 $ 103,441 $ 141,940 $ 67,329 $ 321,919 U.S. corporate debt securities Amortized cost $ 38,783 $ 298,185 $ 164,297 $ 34,613 $ 535,878 Estimated fair value $ 38,864 $ 307,140 $ 170,495 $ 36,873 $ 553,372 Foreign corporate debt securities Amortized cost $ 25,981 $ 201,863 $ 78,656 $ 29,462 $ 335,962 Estimated fair value $ 26,005 $ 205,528 $ 83,018 $ 30,666 $ 345,217 Total debt securities, excluding mortgage-backed securities Amortized cost $ 250,532 $ 893,712 $ 750,432 $ 660,113 $ 2,554,789 Estimated fair value $ 251,042 $ 910,443 $ 778,857 $ 695,036 $ 2,635,378 Total mortgage-backed securities Amortized cost $ 3,241,966 Estimated fair value $ 3,278,258 Total debt securities Amortized cost $ 5,796,755 Estimated fair value $ 5,913,636 Mortgage-backed securities, which include contractual terms to maturity, are not categorized by contractual maturity as borrowers may have the right to call or prepay obligations with, or without, call or prepayment penalties. Investments in equity securities are as follows: Cost Estimated (in thousands) December 31, 2019 Preferred stocks $ 21,849 $ 18,094 Common stocks 328,110 374,224 $ 349,959 $ 392,318 December 31, 2018 Preferred stocks $ 16,892 $ 14,162 Common stocks 341,460 339,373 $ 358,352 $ 353,535 Net gains (realized and unrealized) of $66.7 million and net losses (realized and unrealized) of $38.6 million were recognized for the years ended December 31, 2019 and 2018, respectively, as a result of changes in the fair values of equity securities. Included in net gains during the year ended December 31, 2019 were net unrealized gains of $52.3 million and included in net losses during the year ended December 31, 2018 were net unrealized losses of $37.6 million, related to equity securities still held at December 31, 2019 and 2018, respectively. For the year ended December 31, 2017, sales of equity securities resulted in realized gains of $30.2 million and realized losses of $2.1 million. The composition of the investment portfolio at December 31, 2019, by credit rating, is as follows: A- or higher BBB+ to BBB- Non-Investment Grade Total (in thousands, except percentages) Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Debt securities: U.S. Treasury bonds $ 143,941 100.0 $ — — $ — — $ 143,941 100.0 Municipal bonds 1,045,628 95.9 43,843 4.0 1,368 0.1 1,090,839 100.0 Foreign government bonds 153,718 85.4 23,549 13.0 2,823 1.6 180,090 100.0 Governmental agency bonds 321,919 100.0 — — — — 321,919 100.0 Governmental agency mortgage-backed securities 3,278,258 100.0 — — — — 3,278,258 100.0 U.S. corporate debt securities 244,883 44.2 226,098 40.9 82,391 14.9 553,372 100.0 Foreign corporate debt securities 136,172 39.4 178,779 51.8 30,266 8.8 345,217 100.0 Total debt securities 5,324,519 90.0 472,269 8.0 116,848 2.0 5,913,636 100.0 Preferred stocks 46 0.3 16,865 93.2 1,183 6.5 18,094 100.0 Total $ 5,324,565 89.8 $ 489,134 8.2 $ 118,031 2.0 $ 5,931,730 100.0 Included in debt securities at December 31, 2019, were bank loans totaling $80.7 million, of which $72.1 million were non-investment grade; high yield corporate debt securities totaling $35.3 million, all of which were non-investment grade; and emerging market debt securities totaling $80.2 million, of which $8.1 million were non-investment grade. The composition of the debt securities portfolio in an unrealized loss position at December 31, 2019, by credit rating, is as follows: A- or higher BBB+ to BBB- Non-Investment Grade Total (in thousands, except percentages) Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage U.S. Treasury bonds $ 15,700 100.0 $ — — $ — — $ 15,700 100.0 Municipal bonds 26,521 82.5 5,639 17.5 — — 32,160 100.0 Foreign government bonds 114,130 92.7 9,038 7.3 — — 123,168 100.0 Governmental agency bonds 39,416 100.0 — — — — 39,416 100.0 Governmental agency mortgage-backed securities 1,356,611 100.0 — — — — 1,356,611 100.0 U.S. corporate debt securities 9,883 18.7 22,264 42.2 20,676 39.1 52,823 100.0 Foreign corporate debt securities 26,994 62.4 8,925 20.6 7,349 17.0 43,268 100.0 Total $ 1,589,255 95.5 $ 45,866 2.8 $ 28,025 1.7 $ 1,663,146 100.0 Debt securities in an unrealized loss position at December 31, 2019, included bank loans totaling $18.1 million, of which $17.5 million were non-investment grade; high yield corporate debt securities totaling $9.3 million, all of which were non-investment grade; and emerging market debt securities totaling $19.9 million, of which $1.2 million were non-investment grade. The credit ratings in the above tables reflect published ratings obtained from globally recognized securities rating agencies. 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- or higher” rating category because the payments of principal and interest are guaranteed by the governmental agency that issued the security. |