Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) employee	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) employee segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) employee
Segment Reporting [Abstract]
Number of reportable segments | segment			4
Income Statement Related Disclosures [Abstract]
Net interest income	$ 455,531	$ 425,388	$ 936,283	$ 817,635
Non-interest revenue	112,276	97,266	245,402	202,600
Non-interest expense	307,181	282,051	629,034	554,501
Pre-provision net revenue (PPNR)	260,626	240,603	552,651	465,734
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	44,353,537		44,353,537		$ 43,716,353
Total deposits	$ 50,080,392		$ 50,080,392		$ 48,871,559
Total full-time equivalent employees | employee	5,097		5,097		5,027
Operating Segments | Wholesale Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 194,334	169,736	$ 393,434	325,984
Non-interest revenue	13,752	9,285	29,652	17,683
Non-interest expense	33,141	27,062	66,989	53,742
Pre-provision net revenue (PPNR)	174,945	151,959	356,097	289,925
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	26,923,516		26,923,516		$ 25,865,667
Total deposits	$ 13,094,855		$ 13,094,855		$ 12,942,732
Total full-time equivalent employees | employee	342		342		337
Operating Segments | Community Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 110,242	100,892	$ 221,647	197,019
Non-interest revenue	12,584	12,468	38,124	26,051
Non-interest expense	33,833	32,822	67,215	63,090
Pre-provision net revenue (PPNR)	88,993	80,538	192,556	159,980
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	8,061,533		8,061,533		$ 8,138,606
Total deposits	$ 10,204,029		$ 10,204,029		$ 10,798,409
Total full-time equivalent employees | employee	599		599		598
Operating Segments | Consumer Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 158,113	103,727	$ 312,744	201,132
Non-interest revenue	20,983	22,095	41,711	43,739
Non-interest expense	49,103	47,795	96,737	92,662
Pre-provision net revenue (PPNR)	129,993	78,027	257,718	152,209
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	2,845,695		2,845,695		$ 2,933,504
Total deposits	$ 18,496,141		$ 18,496,141		$ 18,561,521
Total full-time equivalent employees | employee	1,540		1,540		1,529
Operating Segments | Financial Management Services
Income Statement Related Disclosures [Abstract]
Net interest income	$ 17,134	17,655	$ 33,681	35,818
Non-interest revenue	49,085	45,195	102,291	90,359
Non-interest expense	42,607	44,297	86,653	88,404
Pre-provision net revenue (PPNR)	23,612	18,553	49,319	37,773
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	5,330,753		5,330,753		$ 5,157,014
Total deposits	$ 206,107		$ 206,107		$ 102,496
Total full-time equivalent employees | employee	752		752		768
Treasury and Corporate Other
Income Statement Related Disclosures [Abstract]
Net interest income	$ (24,292)	33,378	$ (25,223)	57,682
Non-interest revenue	15,872	8,223	33,624	24,768
Non-interest expense	148,497	130,075	311,440	256,603
Pre-provision net revenue (PPNR)	(156,917)	$ (88,474)	(303,039)	$ (174,153)
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	1,192,040		1,192,040		$ 1,621,562
Total deposits	$ 8,079,260		$ 8,079,260		$ 6,466,401
Total full-time equivalent employees | employee	1,864		1,864		1,795