| Schedule of Investment Securities |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2024 | | December 31, 2023 | | Amortized
cost | Gross
unrealized
gains | Gross
unrealized
losses | Estimated
fair value | | Amortized
cost | Gross
unrealized
gains | Gross
unrealized
losses | Estimated
fair value | Equity (GE HealthCare) | $ | — | | $ | — | | $ | — | | $ | 2,379 | | | $ | — | | $ | — | | $ | — | | $ | 4,761 | | | Equity note (AerCap) | — | | — | | — | | 959 | | | — | | — | | — | | 944 | | | | | | | | | | | | | Current investment securities | $ | — | | $ | — | | $ | — | | $ | 3,338 | | | $ | — | | $ | — | | $ | — | | $ | 5,706 | | | Debt | | | | | | | | | | | U.S. corporate | $ | 27,771 | | $ | 618 | | $ | (2,122) | | $ | 26,268 | | | $ | 27,495 | | $ | 1,034 | | $ | (1,606) | | $ | 26,923 | | | Non-U.S. corporate | 2,710 | | 23 | | (270) | | 2,463 | | | 2,529 | | 34 | | (209) | | 2,353 | | | State and municipal | 2,647 | | 36 | | (220) | | 2,464 | | | 2,828 | | 79 | | (185) | | 2,723 | | | Mortgage and asset-backed | 5,044 | | 40 | | (220) | | 4,864 | | | 4,827 | | 34 | | (291) | | 4,571 | | | Government and agencies | 1,985 | | 1 | | (114) | | 1,873 | | | 1,213 | | 3 | | (116) | | 1,100 | | | Other equity | 198 | | — | | — | | 198 | | | 331 | | — | | — | | 331 | | | Non-current investment securities | $ | 40,356 | | $ | 719 | | $ | (2,946) | | $ | 38,129 | | | $ | 39,222 | | $ | 1,183 | | $ | (2,406) | | $ | 38,000 | | | | | | | | | | | |
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| Realized and Unrealized Gain (Loss) on Securities |
| | | | | | | | | | | | | | | | | | | Three months ended June 30 | | Six months ended June 30 | | 2024 | 2023 | | 2024 | 2023 | | Net unrealized gains (losses) for equity securities with readily determinable fair value (RDFV) | $ | (378) | | $ | 522 | | | $ | 62 | | $ | 6,562 | | | Proceeds from debt/equity securities sales and early redemptions | 1,083 | | 3,745 | | | 4,278 | | 6,754 | | | Gross realized gains on debt securities | 9 | | 26 | | | 17 | | 38 | | | Gross realized losses on debt securities | (28) | | (25) | | | (38) | | (46) | |
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| Contractual Maturities of Debt Securities (Excluding Mortgage and Asset-Backed Securities) |
Contractual maturities of our debt securities (excluding mortgage and asset-backed securities) at June 30, 2024 are as follows:
| | | | | | | | | | Amortized cost | Estimated fair value | | Within one year | $ | 1,422 | | $ | 1,417 | | | After one year through five years | 5,249 | | 5,269 | | | After five years through ten years | 4,911 | | 4,917 | | | After ten years | 23,532 | | 21,463 | |
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