Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Interest income	$ 886,965	$ 805,513
Interest expense	360,491	341,319
Net interest income	526,474	464,194
Provision for credit losses	23,963	21,673
Non-interest income	116,634	140,580
Salaries	123,917	112,172
Commissions and incentive compensation	52,536	51,001
Benefits	35,073	32,000
Other segment expenses	154,564	137,972
Total non-interest expense	366,090	333,145
Income before taxes	253,055	249,956
Income tax expense	64,016	62,662
Net income	189,039	187,294
Total assets at period end	65,870,066	57,576,933	$ 64,879,668
Operating Segments
Segment Reporting Information [Line Items]
Interest income	876,197	795,044
Interest expense	360,491	341,319
Net interest income	515,706	453,725
Provision for credit losses	23,963	21,673
Non-interest income	138,322	160,438
Salaries	123,452	111,662
Commissions and incentive compensation	52,536	51,001
Benefits	35,073	32,000
Other segment expenses	165,949	147,871
Total non-interest expense	377,010	342,534
Income before taxes	253,055	249,956
Income tax expense	64,016	62,662
Net income	189,039	187,294
Total assets at period end	65,870,066	57,576,933
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Interest income	768,968	691,897
Interest expense	349,957	328,212
Net interest income	419,011	363,685
Provision for credit losses	22,428	20,392
Non-interest income	73,493	74,636
Salaries	98,586	86,682
Commissions and incentive compensation	32,137	29,781
Benefits	27,374	24,676
Other segment expenses	132,490	116,601
Total non-interest expense	290,587	257,740
Income before taxes	179,489	160,189
Income tax expense	45,219	40,143
Net income	134,270	120,046
Total assets at period end	53,531,046	45,720,014
Operating Segments | Specialty Finance
Segment Reporting Information [Line Items]
Interest income	101,698	95,144
Interest expense	10,391	12,862
Net interest income	91,307	82,282
Provision for credit losses	1,535	1,281
Non-interest income	31,039	27,317
Salaries	15,762	14,538
Commissions and incentive compensation	9,041	8,639
Benefits	4,718	4,314
Other segment expenses	23,445	22,781
Total non-interest expense	52,966	50,272
Income before taxes	67,845	58,046
Income tax expense	17,552	15,523
Net income	50,293	42,523
Total assets at period end	11,312,205	10,713,783
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Interest income	5,531	8,003
Interest expense	143	245
Net interest income	5,388	7,758
Provision for credit losses	0	0
Non-interest income	33,790	58,485
Salaries	9,104	10,442
Commissions and incentive compensation	11,358	12,581
Benefits	2,981	3,010
Other segment expenses	10,014	8,489
Total non-interest expense	33,457	34,522
Income before taxes	5,721	31,721
Income tax expense	1,245	6,996
Net income	4,476	24,725
Total assets at period end	1,026,815	1,143,136
Intersegment Eliminations
Segment Reporting Information [Line Items]
Interest income	10,768	10,469
Interest expense	0	0
Net interest income	10,768	10,469
Provision for credit losses	0	0
Non-interest income	(21,688)	(19,858)
Salaries	465	510
Commissions and incentive compensation	0	0
Benefits	0	0
Other segment expenses	(11,385)	(9,899)
Total non-interest expense	(10,920)	(9,389)
Income before taxes	0	0
Income tax expense	0	0
Net income	0	0
Total assets at period end	$ 0	$ 0