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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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