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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, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 237,505 |
Due from one year to five years | 75,121 |
Due from five years to ten years | 544,101 |
Due after ten years | 1,057,057 |
Amortized cost, before securities without debt maturities | 1,913,784 |
Amortized Cost | 2,945,913 |
Estimated Fair Value |  |
Due in one year or less | 231,571 |
Due from one year to five years | 72,835 |
Due from five years to ten years | 509,791 |
Due after ten years | 913,505 |
Available for sale securities, debt maturities, before securities without single maturities | 1,727,702 |
Estimated Fair Value | 2,642,389 | $ 2,646,767
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 | 1,307,712 | 1,321,256
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 | 1,125,027 | 1,125,049
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 238,775 |
Amortized Cost | 238,775 | 242,527
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 212,574 |
Estimated Fair Value | 212,574 | 212,698
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 444,431 |
Amortized Cost, Held to Maturity | 444,431 | 457,325
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 392,353 |
Estimated Fair Value, Held to Maturity | 392,353 | 399,845
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 651,767 |
Amortized Cost | 651,767 | 631,604
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 571,663 |
Estimated Fair Value | 571,663 | 552,522
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 863,281 |
Amortized Cost, Held to Maturity | 863,281 | 863,931
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 732,674 |
Estimated Fair Value, Held to Maturity | 732,674 | 725,204
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 141,587 |
Amortized Cost | 141,587 | 147,155
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 130,450 |
Estimated Fair Value | 130,450 | $ 134,033
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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