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Investment Securities - Debt Maturities (Details) - Investment securities: - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 678,261 |
Due after one year through five years | 845,628 |
Due after five years through ten years | 1,446,607 |
Due after ten years | 713,570 |
Debt securities, available-for-sale, amortized cost | 3,684,066 | $ 3,843,666
Fair Value |  |
Due within one year | 678,387 |
Due after one year through five years | 846,303 |
Due after five years through ten years | 1,450,446 |
Due after ten years | 721,068 |
Total, Fair Value | $ 3,696,204 | $ 3,853,692
Weighted- Average Yield |  |
Due within one year | 1.64% |
Due after one year through five years | 0.55% |
Due after five years through ten years | 0.64% |
Due after ten years | 0.64% |
Total, Weighted-Average Yield | 0.81% |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 + Details
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