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Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Total | $ 1,064,618 | $ 728,794
Mortgage-backed securities | 1,007,880 | 871,100
Amortized Cost | 2,072,498 | 1,599,894
Fair Value |  |
Total | 1,061,603 | 739,605
Mortgage-backed securities | 1,005,324 | 887,588
Fair Value | 2,066,927 | 1,627,193
Available-for-sale securities |  |
Amortized Cost |  |
Due in one year or less | 57,011 | 54,484
Due after one year through five years | 463,136 | 379,044
Due after five years through ten years | 487,701 | 228,572
Due after ten years | 56,770 | 66,694
Fair Value |  |
Due in one year or less | 57,604 | 55,008
Due after one year through five years | 465,980 | 388,132
Due after five years through ten years | 481,464 | 229,107
Due after ten years | $ 56,555 | $ 67,358

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