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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for Sale |  |
Due in one year or less | $ 148,382 |
Due from one year to five years | 159,126 |
Due from five years to ten years | 535,229 |
Due after ten years | 1,128,490 |
Amortized cost, before securities without debt maturities | 1,971,227 |
Amortized Cost | 2,992,513 | $ 3,129,530
Estimated Fair Value |  |
Due in one year or less | 143,463 |
Due from one year to five years | 154,536 |
Due from five years to ten years | 497,049 |
Due after ten years | 952,466 |
Available for sale securities, debt maturities, before securities without single maturities | 1,747,514 |
Estimated Fair Value | 2,646,767 | 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 |
Amortized Cost | 1,321,256 | 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 |
Total | 1,125,049 |
Residential mortgage-backed securities |  |
Available for Sale |  |
Available-for-sale securities, amortized cost without single maturity date | 242,527 |
Amortized Cost | 242,527 | 231,607
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 212,698 |
Estimated Fair Value | 212,698 | 229,795
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 457,325 |
Amortized Cost | 457,325 | 404,958
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 399,845 |
Total | 399,845 | 408,913
Commercial mortgage-backed securities |  |
Available for Sale |  |
Available-for-sale securities, amortized cost without single maturity date | 631,604 |
Amortized Cost | 631,604 | 974,541
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 552,522 |
Estimated Fair Value | 552,522 | 971,148
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 863,931 |
Amortized Cost | 863,931 | 575,426
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 725,204 |
Total | 725,204 | 556,954
Collateralized mortgage obligations |  |
Available for Sale |  |
Available-for-sale securities, amortized cost without single maturity date | 147,155 |
Amortized Cost | 147,155 | 206,532
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 134,033 |
Estimated Fair Value | 134,033 | $ 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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