Basis of Accounting and Consolidation - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Balance	$ 737,948	$ 633,155	$ 660,687	$ 600,715	$ 626,268	$ 633,894
Accumulated Other Comprehensive Income (Loss)
Net unrealized losses on securities available-for-sale	(251,974)	(213,387)
Tax benefit	73,071	61,880
Balance	$ (178,903)	$ (151,507)	$ (151,566)	$ (167,663)	$ (128,240)	$ (831)