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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 13,985 |
Due from one year to five years | 105,663 |
Due from five years to ten years | 298,517 |
Due after ten years | 834,878 |
Amortized cost, before securities without debt maturities | 1,253,043 |
Amortized Cost | 3,871,029 |
Estimated Fair Value |  |
Due in one year or less | 13,908 |
Due from one year to five years | 104,052 |
Due from five years to ten years | 283,407 |
Due after ten years | 675,063 |
Available for sale securities, debt maturities, before securities without single maturities | 1,076,430 |
Estimated Fair Value | 3,575,043 | $ 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 | 1,496,280 | 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 | 1,309,834 | 1,183,449
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 1,000,882 |
Amortized Cost | 1,000,882 | 1,029,846
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 973,352 |
Estimated Fair Value | 973,352 | 989,875
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 640,273 |
Amortized Cost, Held to Maturity | 640,273 | 537,856
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 589,369 |
Estimated Fair Value, Held to Maturity | 589,369 | 477,696
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 611,804 |
Amortized Cost | 611,804 | 617,605
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 518,413 |
Estimated Fair Value | 518,413 | 516,882
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 856,007 |
Amortized Cost, Held to Maturity | 856,007 | 857,713
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 720,465 |
Estimated Fair Value, Held to Maturity | 720,465 | 705,753
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 1,005,300 |
Amortized Cost | 1,005,300 | 798,157
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 1,006,848 |
Estimated Fair Value | 1,006,848 | $ 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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