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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 8,233 |
Due from one year to five years | 246,887 |
Due from five years to ten years | 378,245 |
Due after ten years | 1,124,366 |
Amortized cost, before securities without debt maturities | 1,757,731 |
Amortized Cost | 3,024,001 |
Estimated Fair Value |  |
Due in one year or less | 8,422 |
Due from one year to five years | 247,567 |
Due from five years to ten years | 394,995 |
Due after ten years | 1,159,157 |
Available for sale securities, debt maturities, before securities without single maturities | 1,810,141 |
Estimated Fair Value | 3,084,337 | $ 3,062,143
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 | 916,423 | 278,281
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 | 910,156 |
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 191,623 |
Amortized Cost | 191,623 | 373,779
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 190,123 |
Estimated Fair Value | 190,123 | 377,998
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 410,189 |
Amortized Cost, Held to Maturity | 410,189 | 278,281
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 417,478 |
Estimated Fair Value, Held to Maturity | 417,478 | 296,857
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 827,921 |
Amortized Cost | 827,921 | 741,172
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 832,038 |
Estimated Fair Value | 832,038 | 762,415
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 506,234 |
Amortized Cost, Held to Maturity | 506,234 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 492,678 |
Estimated Fair Value, Held to Maturity | 492,678 |
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 246,726 |
Amortized Cost | 246,726 | 491,321
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 252,035 |
Estimated Fair Value | 252,035 | $ 503,766
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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