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Segment Information - Schedule of Operating Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Net interest income:
Net interest income	$ 470,610	$ 447,537	$ 934,804	$ 905,532
Net interest income, change in contribution	$ 23,073		$ 29,272
Net interest income, percent change in contribution	5.00%		3.00%
Provision for credit losses:
Provision for credit losses	$ 40,061	28,514	$ 61,734	51,559
Provision for credit losses, change in contribution	$ 11,547		$ 10,175
Provision for credit losses, percent change in contribution	40.00%		20.00%
Non-interest income:
Non-interest income	$ 121,147	113,030	$ 261,727	220,799
Non-interest income, change in contribution	$ 8,117		$ 40,928
Non-interest income, percent change in contribution	7.00%		19.00%
Net revenue:
Net revenue	$ 591,757	560,567	$ 1,196,531	1,126,331
Net revenue, change in contribution	$ 31,190		$ 70,200
Net revenue, percent change in contribution	6.00%		6.00%
Segment profit:
Segment profit	$ 152,388	154,750	$ 339,682	334,948
Segment profit, change in contribution	$ (2,362)		$ 4,734
Segment profit, percent change in contribution	(2.00%)		10.00%
Segment assets:
Segment assets	$ 59,781,516	54,286,176	$ 59,781,516	54,286,176	$ 56,259,934
Segment assets, change in contribution	$ 5,495,340
Segment assets, percent change in contribution	10.00%
Community banking
Segment profit:
Segment profit	$ 91,235	102,517	211,282	236,749
Segment profit, change in contribution	$ (11,282)		$ (25,467)
Segment profit, percent change in contribution	(11.00%)		12.00%
Segment assets:
Segment assets	$ 47,611,508	42,452,673	$ 47,611,508	42,452,673
Segment assets, change in contribution	$ 5,158,835
Segment assets, percent change in contribution	12.00%
Specialty finance
Segment profit:
Segment profit	$ 53,091	46,402	95,614	83,139
Segment profit, change in contribution	$ 6,689		$ 12,475
Segment profit, percent change in contribution	14.00%		4.00%
Segment assets:
Segment assets	$ 11,014,840	10,549,819	$ 11,014,840	10,549,819
Segment assets, change in contribution	$ 465,021
Segment assets, percent change in contribution	4.00%
Wealth management
Segment profit:
Segment profit	$ 8,062	5,831	32,786	15,060
Segment profit, change in contribution	$ 2,231		$ 17,726
Segment profit, percent change in contribution	38.00%		(10.00%)
Segment assets:
Segment assets	$ 1,155,168	1,283,684	$ 1,155,168	1,283,684
Segment assets, change in contribution	$ (128,516)
Segment assets, percent change in contribution	(10.00%)
Operating Segments
Net interest income:
Net interest income	$ 461,951	438,629	915,676	887,783
Net interest income, change in contribution	$ 23,322		$ 27,893
Net interest income, percent change in contribution	5.00%		3.00%
Provision for credit losses:
Provision for credit losses	$ 40,061	28,514	$ 61,734	51,559
Provision for credit losses, change in contribution	$ 11,547		$ 10,175
Provision for credit losses, percent change in contribution	40.00%		20.00%
Non-interest income:
Non-interest income	$ 139,541	133,258	$ 299,979	258,078
Non-interest income, change in contribution	$ 6,283		$ 41,901
Non-interest income, percent change in contribution	5.00%		16.00%
Net revenue:
Net revenue	$ 601,492	571,887	$ 1,215,655	1,145,861
Net revenue, change in contribution	$ 29,605		$ 69,794
Net revenue, percent change in contribution	5.00%		6.00%
Operating Segments | Community banking
Net interest income:
Net interest income	$ 358,832	346,232	$ 722,517	716,080
Net interest income, change in contribution	$ 12,600		$ 6,437
Net interest income, percent change in contribution	4.00%		1.00%
Provision for credit losses:
Provision for credit losses	$ 36,325	26,713	$ 56,717	47,812
Provision for credit losses, change in contribution	$ 9,612		$ 8,905
Provision for credit losses, percent change in contribution	36.00%		19.00%
Non-interest income:
Non-interest income	$ 71,619	68,130	$ 146,255	136,863
Non-interest income, change in contribution	$ 3,489		$ 9,392
Non-interest income, percent change in contribution	5.00%		7.00%
Net revenue:
Net revenue	$ 430,451	414,362	$ 868,772	852,943
Net revenue, change in contribution	$ 16,089		$ 15,829
Net revenue, percent change in contribution	4.00%		2.00%
Operating Segments | Specialty finance
Net interest income:
Net interest income	$ 95,191	84,993	$ 177,473	155,344
Net interest income, change in contribution	$ 10,198		$ 22,129
Net interest income, percent change in contribution	12.00%		14.00%
Provision for credit losses:
Provision for credit losses	$ 3,736	1,801	$ 5,017	3,747
Provision for credit losses, change in contribution	$ 1,935		$ 1,270
Provision for credit losses, percent change in contribution	107.00%		34.00%
Non-interest income:
Non-interest income	$ 32,317	31,737	$ 59,634	57,527
Non-interest income, change in contribution	$ 580		$ 2,107
Non-interest income, percent change in contribution	2.00%		4.00%
Net revenue:
Net revenue	$ 127,508	116,730	$ 237,107	212,871
Net revenue, change in contribution	$ 10,778		$ 24,236
Net revenue, percent change in contribution	9.00%		11.00%
Operating Segments | Wealth management
Net interest income:
Net interest income	$ 7,928	7,404	$ 15,686	16,359
Net interest income, change in contribution	$ 524		$ (673)
Net interest income, percent change in contribution	7.00%		(4.00%)
Provision for credit losses:
Provision for credit losses	$ 0	0	$ 0	0
Provision for credit losses, change in contribution	$ 0		$ 0
Provision for credit losses, percent change in contribution	0.00%		0.00%
Non-interest income:
Non-interest income	$ 35,605	33,391	$ 94,090	63,688
Non-interest income, change in contribution	$ 2,214		$ 30,402
Non-interest income, percent change in contribution	7.00%		48.00%
Net revenue:
Net revenue	$ 43,533	40,795	$ 109,776	80,047
Net revenue, change in contribution	$ 2,738		$ 29,729
Net revenue, percent change in contribution	7.00%		37.00%
Intersegment Eliminations
Net interest income:
Net interest income	$ 8,659	8,908	$ 19,128	17,749
Net interest income, change in contribution	$ (249)		$ 1,379
Net interest income, percent change in contribution	(3.00%)		8.00%
Provision for credit losses:
Provision for credit losses	$ 0	0	$ 0	0
Provision for credit losses, change in contribution	$ 0		$ 0
Provision for credit losses, percent change in contribution	0.00%		0.00%
Non-interest income:
Non-interest income	$ (18,394)	(20,228)	$ (38,252)	(37,279)
Non-interest income, change in contribution	$ 1,834		$ (973)
Non-interest income, percent change in contribution	(9.00%)		3.00%
Net revenue:
Net revenue	$ (9,735)	$ (11,320)	$ (19,124)	$ (19,530)
Net revenue, change in contribution	$ 1,585		$ 406
Net revenue, percent change in contribution	(14.00%)		(2.00%)

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