Unaudited Quarterly Financial Data (Condensed) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summarized unaudited quarterly financial data
Interest income	$ 225,085	$ 214,402	$ 199,637	$ 190,516	$ 192,825	$ 166,741	$ 159,956	$ 161,552	$ 829,640	$ 681,074	$ 627,064
Interest expense	21,026	9,075	6,199	4,961	5,203	4,128	4,487	4,740	41,261	18,558	27,315
Net Interest Income	204,059	205,327	193,438	185,555	187,622	162,613	155,469	156,812	788,379	662,516	599,749
Provision for credit losses	6,124	8,341	(1,533)	7,031	27,956	725	(5,653)	48	19,963	23,076	39,765
Net interest income after provision for credit losses	197,935	196,986	194,971	178,524	159,666	161,888	161,122	156,764	768,416	639,440	559,984
Non-interest income	28,483	30,406	28,280	33,563	34,362	34,815	35,522	40,121	120,732	144,820	172,867
Non-interest expense	128,979	130,060	129,521	130,308	134,047	104,108	100,082	96,585	518,868	434,822	404,811
Income Before Income Taxes	97,439	97,332	93,730	81,779	59,981	92,595	96,562	100,300	370,280	349,438	328,040
Federal and state income tax expense	17,762	17,994	17,338	13,984	9,272	16,976	18,935	19,498	67,078	64,681	61,640
Net Income	$ 79,677	$ 79,338	$ 76,392	$ 67,795	$ 50,709	$ 75,619	$ 77,627	$ 80,802	$ 303,202	$ 284,757	$ 266,400
Basic earnings per share (in dollars per share)	$ 0.72	$ 0.72	$ 0.69	$ 0.61	$ 0.46	$ 0.79	$ 0.81	$ 0.85	$ 2.74	$ 2.87	$ 2.81
Diluted earnings per share (in dollars per share)	$ 0.72	$ 0.72	$ 0.69	$ 0.61	$ 0.46	$ 0.79	$ 0.81	$ 0.85	$ 2.74	$ 2.86	$ 2.81