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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, 2021 | Dec. 31, 2020
--- | --- | ---
Available for Sale |  |
Due in one year or less | $ 9,053 |
Due from one year to five years | 163,249 |
Due from five years to ten years | 391,040 |
Due after ten years | 1,153,508 |
Amortized cost, before securities without debt maturities | 1,716,850 |
Amortized Cost | 3,129,530 | $ 2,947,500
Estimated Fair Value |  |
Due in one year or less | 9,175 |
Due from one year to five years | 163,924 |
Due from five years to ten years | 405,782 |
Due after ten years | 1,198,207 |
Available for sale securities, debt maturities, before securities without single maturities | 1,777,088 |
Estimated Fair Value | 3,187,390 | 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 | 980,384 | 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 |
Total | 965,867 |
Residential mortgage-backed securities |  |
Available for Sale |  |
Available-for-sale securities, amortized cost without single maturity date | 231,607 |
Amortized Cost | 231,607 | 373,779
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 229,795 |
Estimated Fair Value | 229,795 | 377,998
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 404,958 |
Amortized Cost | 404,958 | 278,281
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 408,913 |
Total | 408,913 | 296,857
Commercial mortgage-backed securities |  |
Available for Sale |  |
Available-for-sale securities, amortized cost without single maturity date | 974,541 |
Amortized Cost | 974,541 | 741,172
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 971,148 |
Estimated Fair Value | 971,148 | 762,415
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 575,426 |
Amortized Cost | 575,426 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 556,954 |
Total | 556,954 |
Collateralized mortgage obligations |  |
Available for Sale |  |
Available-for-sale securities, amortized cost without single maturity date | 206,532 |
Amortized Cost | 206,532 | 491,321
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 209,359 |
Estimated Fair Value | 209,359 | $ 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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