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Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 58,553 | $ 77,159
Due after one year through five years | 525,430 | 474,537
Due after five years through ten years | 508,112 | 501,748
Due after ten years | 54,422 | 54,742
Total | 1,146,517 | 1,108,186
Mortgage-backed securities | 960,389 | 955,604
Amortized Cost | 2,106,906 | 2,063,790
Fair Value |  |
Due in one year or less | 58,888 | 77,892
Due after one year through five years | 501,283 | 471,776
Due after five years through ten years | 470,234 | 492,573
Due after ten years | 48,693 | 54,559
Total | 1,079,098 | 1,096,800
Mortgage-backed securities | 902,050 | 947,713
Fair Value | $ 1,981,148 | $ 2,044,513

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