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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, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 163,165 |
Due from one year to five years | 262,405 |
Due from five years to ten years | 430,737 |
Due after ten years | 1,113,977 |
Amortized cost, before securities without debt maturities | 1,970,284 |
Amortized Cost | 3,465,368 |
Estimated Fair Value |  |
Due in one year or less | 163,187 |
Due from one year to five years | 259,212 |
Due from five years to ten years | 426,189 |
Due after ten years | 1,065,372 |
Available for sale securities, debt maturities, before securities without single maturities | 1,913,960 |
Estimated Fair Value | 3,324,333 | $ 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 | 964,341 | 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 | 888,989 | 965,867
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 295,590 |
Amortized Cost | 295,590 | 231,607
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 275,602 |
Estimated Fair Value | 275,602 | 229,795
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 384,675 |
Amortized Cost, Held to Maturity | 384,675 | 404,958
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 365,264 |
Estimated Fair Value, Held to Maturity | 365,264 | 408,913
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 1,024,224 |
Amortized Cost | 1,024,224 | 974,541
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 963,507 |
Estimated Fair Value | 963,507 | 971,148
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 579,666 |
Amortized Cost, Held to Maturity | 579,666 | 575,426
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 523,725 |
Estimated Fair Value, Held to Maturity | 523,725 | 556,954
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 175,270 |
Amortized Cost | 175,270 | 206,532
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 171,264 |
Estimated Fair Value | 171,264 | $ 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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