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Investment Securities - Schedule of Maturities of the Investments in Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Within 1 year | $ 169,460 | $ 103,337
After 1 year through 5 years | 482,450 | 449,289
After 5 years through 10 years | 262,308 | 207,980
Over 10 years | 863,001 | 203,783
Total | 1,777,219 | 964,389
Estimated Fair Value |  |
Within 1 year | 169,303 | 102,457
After 1 year through 5 years | 463,265 | 434,608
After 5 years through 10 years | 255,087 | 180,370
Over 10 years | 851,768 | 177,599
Total | $ 1,739,423 | $ 895,034
Weighted Average Rate |  |
Within 1 year | 3.14% | 3.22%
After 1 year through 5 years | 2.79% | 3.32%
After 5 years through 10 years | 2.70% | 1.77%
Over 10 years | 2.41% | 3.13%
Total | 2.62% | 2.96%

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