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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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