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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 9,727 |
Due from one year to five years | 87,566 |
Due from five years to ten years | 340,494 |
Due after ten years | 843,982 |
Amortized cost, before securities without debt maturities | 1,281,769 |
Amortized Cost | 3,544,186 |
Estimated Fair Value |  |
Due in one year or less | 9,548 |
Due from one year to five years | 84,556 |
Due from five years to ten years | 319,163 |
Due after ten years | 734,646 |
Available for sale securities, debt maturities, before securities without single maturities | 1,147,913 |
Estimated Fair Value | 3,313,296 | $ 2,398,352
Amortized Cost |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 0 |
Due after ten years | 0 |
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total | 0 |
Amortized Cost, Held to Maturity | 1,231,982 | 1,267,922
Estimated Fair Value |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 0 |
Due after ten years | 0 |
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value | 0 |
Estimated Fair Value, Held to Maturity | 1,064,304 | 1,072,207
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 911,713 |
Amortized Cost | 911,713 | 223,273
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 895,635 |
Estimated Fair Value | 895,635 | 196,795
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 373,313 |
Amortized Cost, Held to Maturity | 373,313 | 407,075
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 328,926 |
Estimated Fair Value, Held to Maturity | 328,926 | 355,270
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 604,376 |
Amortized Cost | 604,376 | 627,364
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 520,280 |
Estimated Fair Value | 520,280 | 534,388
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 858,669 |
Amortized Cost, Held to Maturity | 858,669 | 860,847
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 735,378 |
Estimated Fair Value, Held to Maturity | 735,378 | 716,937
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 746,328 |
Amortized Cost | 746,328 | 122,824
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 749,468 |
Estimated Fair Value | 749,468 | $ 111,434
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 0 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | $ 0 |

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