Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) employee segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) employee
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Income Statement Related Disclosures [Abstract]
Net interest income	$ 480,751	$ 392,248
Non-interest revenue	133,126	105,334
Non-interest expense	321,852	272,450
Pre-provision net revenue (PPNR)	292,025	225,132
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	44,044,939		$ 43,716,353
Total deposits	$ 49,953,936		$ 48,871,559
Total full-time equivalent employees | employee	5,072		5,027
Operating Segments | Wholesale Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 199,100	156,248
Non-interest revenue	15,900	8,398
Non-interest expense	33,848	26,680
Pre-provision net revenue (PPNR)	181,152	137,966
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	26,845,222		$ 25,865,667
Total deposits	$ 12,758,895		$ 12,942,732
Total full-time equivalent employees | employee	334		337
Operating Segments | Community Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 111,405	96,127
Non-interest revenue	25,540	13,583
Non-interest expense	33,382	30,268
Pre-provision net revenue (PPNR)	103,563	79,442
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	8,068,917		$ 8,138,606
Total deposits	$ 10,619,143		$ 10,798,409
Total full-time equivalent employees | employee	590		598
Operating Segments | Consumer Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 154,631	97,405
Non-interest revenue	20,728	21,644
Non-interest expense	47,633	44,867
Pre-provision net revenue (PPNR)	127,726	74,182
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	2,879,893		$ 2,933,504
Total deposits	$ 18,651,057		$ 18,561,521
Total full-time equivalent employees | employee	1,543		1,529
Operating Segments | Financial Management Services
Income Statement Related Disclosures [Abstract]
Net interest income	$ 16,547	18,163
Non-interest revenue	53,206	45,164
Non-interest expense	44,046	44,107
Pre-provision net revenue (PPNR)	25,707	19,220
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	5,194,815		$ 5,157,014
Total deposits	$ 177,409		$ 102,496
Total full-time equivalent employees | employee	763		768
Treasury and Corporate Other
Income Statement Related Disclosures [Abstract]
Net interest income	$ (932)	24,305
Non-interest revenue	17,752	16,545
Non-interest expense	162,943	126,528
Pre-provision net revenue (PPNR)	(146,123)	$ (85,678)
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	1,056,092		$ 1,621,562
Total deposits	$ 7,747,432		$ 6,466,401
Total full-time equivalent employees | employee	1,842		1,795