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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, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 9,524 |
Due from one year to five years | 287,824 |
Due from five years to ten years | 506,946 |
Due after ten years | 1,146,781 |
Amortized cost, before securities without debt maturities | 1,951,075 |
Amortized Cost | 3,008,323 |
Estimated Fair Value |  |
Due in one year or less | 9,516 |
Due from one year to five years | 277,609 |
Due from five years to ten years | 463,474 |
Due after ten years | 906,391 |
Available for sale securities, debt maturities, before securities without single maturities | 1,656,990 |
Estimated Fair Value | 2,597,384 | $ 3,187,390
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 | 1,339,310 | 980,384
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 | 1,141,710 | 965,867
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 246,854 |
Amortized Cost | 246,854 | 231,607
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 214,252 |
Estimated Fair Value | 214,252 | 229,795
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 470,879 |
Amortized Cost, Held to Maturity | 470,879 | 404,958
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 409,998 |
Estimated Fair Value, Held to Maturity | 409,998 | 408,913
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 655,384 |
Amortized Cost | 655,384 | 974,541
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 583,741 |
Estimated Fair Value | 583,741 | 971,148
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 868,431 |
Amortized Cost, Held to Maturity | 868,431 | 575,426
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 731,712 |
Estimated Fair Value, Held to Maturity | 731,712 | 556,954
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 155,010 |
Amortized Cost | 155,010 | 206,532
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 142,401 |
Estimated Fair Value | 142,401 | $ 209,359
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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