Securities - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 50,922	$ 77,159
Due after one year through five years	508,880	474,537
Due after five years through ten years	367,743	501,748
Due after ten years	39,916	54,742
Total	967,461	1,108,186
Mortgage-backed securities	864,330	955,604
Amortized Cost	1,831,791	2,063,790
Fair Value
Due in one year or less	50,269	77,892
Due after one year through five years	459,721	471,776
Due after five years through ten years	314,408	492,573
Due after ten years	31,679	54,559
Total	856,077	1,096,800
Mortgage-backed securities	738,890	947,713
Fair Value	$ 1,594,967	$ 2,044,513