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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale, Amortized Cost |  |
Within one year | $ 177,458 |
One to five years | 1,991,571 |
Five to ten years | 4,193,417 |
Beyond ten years | 1,471,636 |
Total | 7,834,082 | $ 7,684,889
Available-for-sale, Fair Value |  |
Within one year | 174,950 |
One to five years | 1,848,581 |
Five to ten years | 3,608,726 |
Beyond ten years | 1,159,395 |
Total | $ 6,791,652 | 6,713,055
Available-for-sale, Weighted Average Yield |  |
Within one year | 3.39% |
One to five years | 3.44% |
Five to ten years | 2.57% |
Beyond ten years | 2.58% |
Total | 2.81% |
Held-to-Maturity, Amortized Cost |  |
Within one year | $ 157 |
One to five years | 160,838 |
Five to ten years | 1,161,402 |
Beyond ten years | 1,678,952 |
Total held-to-maturity securities | 3,001,349 | 3,013,493
Held-to-Maturity, Fair Value |  |
Within one year | 147 |
One to five years | 132,056 |
Five to ten years | 1,006,755 |
Beyond ten years | 1,408,618 |
Total | $ 2,547,576 | $ 2,601,188
Held-to-Maturity, Weighted Average Yield |  |
Within one year | 2.23% |
One to five years | 2.63% |
Five to ten years | 2.62% |
Beyond ten years | 2.73% |
Total | 2.68% |

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