Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Total	$ 698,842	$ 967,461
Mortgage-backed securities	884,233	864,330
Amortized Cost	1,583,075	1,831,791
Fair Value
Total	646,802	856,077
Mortgage-backed securities	741,708	738,890
Fair Value	1,388,510	1,594,967
Available-for-sale securities
Amortized Cost
Due in one year or less	79,189	50,922
Due after one year through five years	334,059	508,880
Due after five years through ten years	234,283	367,743
Due after ten years	51,311	39,916
Fair Value
Due in one year or less	78,511	50,269
Due after one year through five years	316,627	459,721
Due after five years through ten years	208,592	314,408
Due after ten years	$ 43,072	$ 31,679