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Segment Information (Summary of Segment Information) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Net interest income:
Net interest income	$ 447,537	$ 337,804	$ 905,532	$ 637,098
Net interest income, change in contribution	$ 109,733		$ 268,434
Net interest income, percent change in contribution	32.00%		42.00%
Provision for credit losses:
Provision for credit losses	$ 28,514	20,417	$ 51,559	24,523
Provision for credit losses, change in contribution	$ 8,097		$ 27,036
Provision for credit losses, percent change in contribution	40.00%		110.00%
Non-interest income:
Non-interest income	$ 113,030	102,942	$ 220,799	265,732
Non-interest income, change in contribution	$ 10,088		$ (44,933)
Non-interest income, percent change in contribution	10.00%		(17.00%)
Net revenue:
Net revenue	$ 560,567	440,746	$ 1,126,331	902,830
Net revenue, change in contribution	$ 119,821		$ 223,501
Net revenue, percent change in contribution	27.00%		25.00%
Segment profit:
Segment profit	$ 154,750	94,513	$ 334,948	221,904
Segment profit, change in contribution	$ 60,237		$ 113,044
Segment profit, percent change in contribution	64.00%		51.00%
Segment assets:
Segment assets	$ 54,286,176	50,969,332	$ 54,286,176	50,969,332	$ 52,949,649
Segment assets, change in contribution	$ 3,316,844
Segment assets, percent change in contribution	7.00%
Community banking
Segment profit:
Segment profit	$ 102,517	54,647	236,749	144,746
Segment profit, change in contribution	$ 47,870		$ 92,003
Segment profit, percent change in contribution	88.00%		64.00%
Segment assets:
Segment assets	$ 42,452,673	40,098,458	$ 42,452,673	40,098,458
Segment assets, change in contribution	$ 2,354,215
Segment assets, percent change in contribution	6.00%
Specialty finance
Segment profit:
Segment profit	$ 46,402	30,558	83,139	60,162
Segment profit, change in contribution	$ 15,844		$ 22,977
Segment profit, percent change in contribution	52.00%		38.00%
Segment assets:
Segment assets	$ 10,549,819	9,207,215	$ 10,549,819	9,207,215
Segment assets, change in contribution	$ 1,342,604
Segment assets, percent change in contribution	15.00%
Wealth management
Segment profit:
Segment profit	$ 5,831	9,308	15,060	16,996
Segment profit, change in contribution	$ (3,477)		$ (1,936)
Segment profit, percent change in contribution	(37.00%)		(11.00%)
Segment assets:
Segment assets	$ 1,283,684	1,663,659	$ 1,283,684	1,663,659
Segment assets, change in contribution	$ (379,975)
Segment assets, percent change in contribution	(23.00%)
Operating Segments
Net interest income:
Net interest income	$ 438,629	329,978	887,783	622,339
Net interest income, change in contribution	$ 108,651		$ 265,444
Net interest income, percent change in contribution	33.00%		43.00%
Provision for credit losses:
Provision for credit losses	$ 28,514	20,417	$ 51,559	24,523
Provision for credit losses, change in contribution	$ 8,097		$ 27,036
Provision for credit losses, percent change in contribution	40.00%		110.00%
Non-interest income:
Non-interest income	$ 133,258	117,932	$ 258,078	294,520
Non-interest income, change in contribution	$ 15,326		$ (36,442)
Non-interest income, percent change in contribution	13.00%		(12.00%)
Net revenue:
Net revenue	$ 571,887	447,910	$ 1,145,861	916,859
Net revenue, change in contribution	$ 123,977		$ 229,002
Net revenue, percent change in contribution	28.00%		25.00%
Operating Segments | Community banking
Net interest income:
Net interest income	$ 346,232	261,726	$ 716,080	490,341
Net interest income, change in contribution	$ 84,506		$ 225,739
Net interest income, percent change in contribution	32.00%		46.00%
Provision for credit losses:
Provision for credit losses	$ 26,713	20,225	$ 47,812	24,343
Provision for credit losses, change in contribution	$ 6,488		$ 23,469
Provision for credit losses, percent change in contribution	32.00%		96.00%
Non-interest income:
Non-interest income	$ 68,130	62,714	$ 136,863	184,602
Non-interest income, change in contribution	$ 5,416		$ (47,739)
Non-interest income, percent change in contribution	9.00%		(26.00%)
Net revenue:
Net revenue	$ 414,362	324,440	$ 852,943	674,943
Net revenue, change in contribution	$ 89,922		$ 178,000
Net revenue, percent change in contribution	28.00%		26.00%
Operating Segments | Specialty finance
Net interest income:
Net interest income	$ 84,993	58,718	$ 155,344	114,088
Net interest income, change in contribution	$ 26,275		$ 41,256
Net interest income, percent change in contribution	45.00%		36.00%
Provision for credit losses:
Provision for credit losses	$ 1,801	192	$ 3,747	180
Provision for credit losses, change in contribution	1,609		3,567
Non-interest income:
Non-interest income	31,737	24,992	57,527	49,114
Non-interest income, change in contribution	$ 6,745		$ 8,413
Non-interest income, percent change in contribution	27.00%		17.00%
Net revenue:
Net revenue	$ 116,730	83,710	$ 212,871	163,202
Net revenue, change in contribution	$ 33,020		$ 49,669
Net revenue, percent change in contribution	39.00%		30.00%
Operating Segments | Wealth management
Net interest income:
Net interest income	$ 7,404	9,534	$ 16,359	17,910
Net interest income, change in contribution	$ (2,130)		$ (1,551)
Net interest income, percent change in contribution	(22.00%)		(9.00%)
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	$ 33,391	30,226	$ 63,688	60,804
Non-interest income, change in contribution	$ 3,165		$ 2,884
Non-interest income, percent change in contribution	10.00%		5.00%
Net revenue:
Net revenue	$ 40,795	39,760	$ 80,047	78,714
Net revenue, change in contribution	$ 1,035		$ 1,333
Net revenue, percent change in contribution	3.00%		2.00%
Intersegment Eliminations
Net interest income:
Net interest income	$ 8,908	7,826	$ 17,749	14,759
Net interest income, change in contribution	$ 1,082		$ 2,990
Net interest income, percent change in contribution	14.00%		20.00%
Provision for credit losses:
Provision for credit losses	$ 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	$ (20,228)	(14,990)	$ (37,279)	(28,788)
Non-interest income, change in contribution	$ (5,238)		$ (8,491)
Non-interest income, percent change in contribution	35.00%		29.00%
Net revenue:
Net revenue	$ (11,320)	$ (7,164)	$ (19,530)	$ (14,029)
Net revenue, change in contribution	$ (4,156)		$ (5,501)
Net revenue, percent change in contribution	58.00%		39.00%

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