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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 160,087 |
Due from one year to five years | 280,399 |
Due from five years to ten years | 447,924 |
Due after ten years | 1,141,173 |
Amortized cost, before securities without debt maturities | 2,029,583 |
Amortized Cost | 3,034,088 |
Estimated Fair Value |  |
Due in one year or less | 160,007 |
Due from one year to five years | 274,819 |
Due from five years to ten years | 427,025 |
Due after ten years | 986,453 |
Available for sale securities, debt maturities, before securities without single maturities | 1,848,304 |
Estimated Fair Value | 2,778,838 | $ 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 | 1,338,963 | 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 | 1,215,325 | 965,867
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 213,567 |
Amortized Cost | 213,567 | 231,607
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 195,359 |
Estimated Fair Value | 195,359 | 229,795
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 466,076 |
Amortized Cost, Held to Maturity | 466,076 | 404,958
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 430,929 |
Estimated Fair Value, Held to Maturity | 430,929 | 408,913
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 636,380 |
Amortized Cost | 636,380 | 974,541
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 587,072 |
Estimated Fair Value | 587,072 | 971,148
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 872,887 |
Amortized Cost, Held to Maturity | 872,887 | 575,426
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 784,396 |
Estimated Fair Value, Held to Maturity | 784,396 | 556,954
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 154,558 |
Amortized Cost | 154,558 | 206,532
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 148,103 |
Estimated Fair Value | 148,103 | $ 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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