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Investment Securities - Debt Maturities (Details) - Investment securities: - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 589,475 |
Due after one year through five years | 1,171,601 |
Due after five years through ten years | 2,534,914 |
Due after ten years | 818,486 |
Available-for-sale, Amortized Cost | 5,114,476 | $ 4,769,426
Fair Value |  |
Due within one year | 584,714 |
Due after one year through five years | 1,135,888 |
Due after five years through ten years | 2,358,496 |
Due after ten years | 794,316 |
Total, Fair Value | $ 4,873,414 | $ 4,579,564
Weighted- Average Yield |  |
Due within one year | 1.35% |
Due after one year through five years | 4.06% |
Due after five years through ten years | 4.39% |
Due after ten years | 5.61% |
Total, Weighted-Average Yield | 4.16% |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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