Unaudited Quarterly Financial Data (Condensed) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Summarized unaudited quarterly financial data
Interest income	$ 297,036	$ 289,578	$ 273,834	$ 279,402	$ 273,496	$ 264,906	$ 247,365	$ 231,888	$ 1,139,850	$ 1,017,655	$ 829,640
Interest expense	105,593	109,347	107,356	112,922	107,040	97,852	75,385	45,696	435,218	325,973	41,261
Net Interest Income	191,443	180,231	166,478	166,480	166,456	167,054	171,980	186,192	704,632	691,682	788,379
Provision for credit losses	8,534	8,005	3,518	8,249	3,013	3,539	2,773	5,470	28,306	14,795	19,963
Net interest income after provision for credit losses	182,909	172,226	162,960	158,231	163,443	163,515	169,207	180,722	676,326	676,887	768,416
Non-interest income	31,549	34,704	32,204	29,989	30,865	30,240	29,079	27,895	128,446	118,079	120,732
Non-interest expense	140,965	144,708	140,952	151,843	132,196	129,576	130,604	134,982	578,468	527,358	518,868
Income Before Income Taxes	73,493	62,222	54,212	36,377	62,112	64,179	67,682	73,635	226,304	267,608	370,280
Federal and state income tax expense	11,739	11,167	9,504	3,750	7,796	11,734	12,727	12,424	36,160	44,681	67,078
Net Income	$ 61,754	$ 51,055	$ 44,708	$ 32,627	$ 54,316	$ 52,445	$ 54,955	$ 61,211	$ 190,144	$ 222,927	$ 303,202
Basic earnings per share (in dollars per share)	$ 0.54	$ 0.45	$ 0.39	$ 0.29	$ 0.49	$ 0.47	$ 0.50	$ 0.55	$ 1.68	$ 2.01	$ 2.74
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.45	$ 0.39	$ 0.29	$ 0.49	$ 0.47	$ 0.50	$ 0.55	$ 1.68	$ 2.01	$ 2.74