Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Interest income	$ 3,477,597	$ 2,893,114	$ 1,747,443
Interest expense	1,515,062	1,055,250	252,081
Net interest income	1,962,535	1,837,864	1,495,362
Provision for credit losses	101,047	114,390	78,589
Non-interest income	488,325	434,106	461,053
Salaries	465,972	438,812	382,181
Commissions and incentive compensation	215,519	182,101	197,873
Benefits	135,617	127,100	116,053
Other segment items	585,616	564,486	481,164
Total non-interest expense	1,402,724	1,312,499	1,177,271
Income before taxes	947,089	845,081	700,555
Income tax expense	252,044	222,455	190,873
Net income	695,045	622,626	509,682
Total assets at end of year	64,879,668	56,259,934	52,949,649
Operating Segments
Segment Reporting Information [Line Items]
Interest income	3,437,582	2,858,005	1,717,264
Interest expense	1,515,062	1,055,250	252,081
Net interest income	1,922,520	1,802,755	1,465,183
Provision for credit losses	101,047	114,390	78,589
Non-interest income	567,318	505,576	520,882
Salaries	464,203	437,146	380,631
Commissions and incentive compensation	215,519	182,101	197,873
Benefits	135,617	127,100	116,053
Other segment items	626,363	602,513	512,364
Total non-interest expense	1,441,702	1,348,860	1,206,921
Income before taxes	947,089	845,081	700,555
Income tax expense	252,044	222,455	190,873
Net income	695,045	622,626	509,682
Total assets at end of year	64,879,668	56,259,934	52,949,649
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Interest income	3,001,500	2,462,103	1,411,485
Interest expense	1,465,237	1,021,128	231,287
Net interest income	1,536,263	1,440,975	1,180,198
Provision for credit losses	88,345	104,895	74,184
Non-interest income	279,845	263,023	298,572
Salaries	364,144	340,993	306,062
Commissions and incentive compensation	130,516	110,986	127,178
Benefits	106,994	100,190	91,875
Other segment items	500,327	484,263	401,183
Total non-interest expense	1,101,981	1,036,432	926,298
Income before taxes	625,782	562,671	478,288
Income tax expense	167,072	148,612	128,939
Net income	458,710	414,059	349,349
Total assets at end of year	52,500,643	44,355,786	41,368,200
Operating Segments | Specialty Finance
Segment Reporting Information [Line Items]
Interest income	405,317	362,035	266,238
Interest expense	49,030	32,991	19,557
Net interest income	356,287	329,044	246,681
Provision for credit losses	12,702	9,495	4,405
Non-interest income	119,339	105,992	97,701
Salaries	61,070	57,024	45,043
Commissions and incentive compensation	36,130	30,395	31,329
Benefits	18,686	17,070	15,812
Other segment items	91,479	82,024	80,600
Total non-interest expense	207,365	186,513	172,784
Income before taxes	255,559	239,028	167,193
Income tax expense	69,214	63,484	46,286
Net income	186,345	175,544	120,907
Total assets at end of year	11,234,012	10,664,887	9,826,254
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Interest income	30,765	33,867	39,541
Interest expense	795	1,131	1,237
Net interest income	29,970	32,736	38,304
Provision for credit losses	0	0	0
Non-interest income	168,134	136,561	124,609
Salaries	38,989	39,129	29,526
Commissions and incentive compensation	48,873	40,720	39,366
Benefits	9,937	9,840	8,366
Other segment items	34,557	36,226	30,581
Total non-interest expense	132,356	125,915	107,839
Income before taxes	65,748	43,382	55,074
Income tax expense	15,758	10,359	15,648
Net income	49,990	33,023	39,426
Total assets at end of year	1,145,013	1,239,261	1,755,195
Intersegment Eliminations
Segment Reporting Information [Line Items]
Interest income	40,015	35,109	30,179
Interest expense	0	0	0
Net interest income	40,015	35,109	30,179
Provision for credit losses	0	0	0
Non-interest income	(78,993)	(71,470)	(59,829)
Salaries	1,769	1,666	1,550
Commissions and incentive compensation	0	0	0
Benefits	0	0	0
Other segment items	(40,747)	(38,027)	(31,200)
Total non-interest expense	(38,978)	(36,361)	(29,650)
Income before taxes	0	0	0
Income tax expense	0	0	0
Net income	0	0	0
Total assets at end of year	$ 0	$ 0	$ 0