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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 350 |
Due after one year through five years | 0 |
Due after five years through ten years | 19,616 |
Due after ten years | 97,950 |
Amortized Cost | 2,228,369 | $ 2,239,433
Estimated Fair Value |  |
Due within one year | 351 |
Due after one year through five years | 0 |
Due after five years through ten years | 19,478 |
Due after ten years | 98,791 |
Estimated Fair Value | 2,233,744 | 2,285,611
Carrying value of securities pledged to secure public deposits, pledged for various borrowings and for other purposes required or permitted by law | 325,000 | 376,100
Collateralized mortgage obligations |  |
Amortized Cost |  |
Amortized Cost | 901,735 | 990,679
Estimated Fair Value |  |
No single maturity date, fair value | 904,659 |
Estimated Fair Value | 904,659 | 1,001,317
Mortgage-backed securities: Residential |  |
Amortized Cost |  |
Amortized Cost | 646,409 | 672,667
Estimated Fair Value |  |
No single maturity date, fair value | 637,828 |
Estimated Fair Value | 637,828 | 681,013
Mortgage-backed securities: Commercial |  |
Amortized Cost |  |
Amortized Cost | 527,528 | 482,874
Estimated Fair Value |  |
No single maturity date, fair value | 537,788 |
Estimated Fair Value | $ 537,788 | $ 507,879

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