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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, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 14,985 |
Due from one year to five years | 134,559 |
Due from five years to ten years | 234,449 |
Due after ten years | 831,226 |
Amortized cost, before securities without debt maturities | 1,215,219 |
Amortized Cost | 3,847,076 |
Estimated Fair Value |  |
Due in one year or less | 14,973 |
Due from one year to five years | 133,654 |
Due from five years to ten years | 228,280 |
Due after ten years | 689,868 |
Available for sale securities, debt maturities, before securities without single maturities | 1,066,775 |
Estimated Fair Value | 3,594,076 | $ 3,410,899
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 | 1,451,194 | 1,395,569
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 | 1,285,350 | 1,183,449
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 877,560 |
Amortized Cost | 877,560 | 1,029,846
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 858,992 |
Estimated Fair Value | 858,992 | 989,875
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 597,922 |
Amortized Cost, Held to Maturity | 597,922 | 537,856
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 555,831 |
Estimated Fair Value, Held to Maturity | 555,831 | 477,696
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 624,969 |
Amortized Cost | 624,969 | 617,605
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 532,867 |
Estimated Fair Value | 532,867 | 516,882
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 853,272 |
Amortized Cost, Held to Maturity | 853,272 | 857,713
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 729,519 |
Estimated Fair Value, Held to Maturity | 729,519 | 705,753
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 1,129,328 |
Amortized Cost | 1,129,328 | 798,157
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 1,135,442 |
Estimated Fair Value | 1,135,442 | $ 788,885
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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