Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]
Other intangible assets, beginning of period			$ 112,645
Amortization	$ (3,851)	$ (4,097)	(11,553)	$ (12,291)
Other intangible assets, end of period	101,093		101,093		$ 112,645
Core Deposit Premium
Finite-lived Intangible Assets [Roll Forward]
Other intangible assets, beginning of period			101,344	116,016	116,016
Amortization			(10,327)		(14,672)
Other intangible assets, end of period	91,017		91,017		101,344
Books of Business And Other Intangibles
Finite-lived Intangible Assets [Roll Forward]
Other intangible assets, beginning of period			11,301	$ 12,935	12,935
Amortization			(1,225)		(1,634)
Other intangible assets, end of period	$ 10,076		$ 10,076		$ 11,301