Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) employee	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) employee segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) employee
Segment Reporting [Abstract]
Number of reportable segments | segment			4
Income Statement Related Disclosures [Abstract]
Net interest income	$ 477,919	$ 384,917	$ 1,295,555	$ 1,140,634
Non-interest revenue	104,298	114,955	306,897	332,997
Non-interest expense	294,010	267,032	848,511	804,697
Pre-provision net revenue	288,207	232,840	753,941	668,934
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	42,571,458		42,571,458		$ 39,311,958
Total deposits	$ 47,697,564		$ 47,697,564		$ 49,427,276
Total full-time equivalent employees | employee	5,033		5,033		4,887
Operating Segments | Wholesale Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 177,844	138,774	$ 503,828	409,265
Non-interest revenue	9,790	10,739	27,473	25,058
Non-interest expense	29,888	22,514	83,630	64,590
Pre-provision net revenue	157,746	126,999	447,671	369,733
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	24,614,311		24,614,311		$ 21,496,050
Total deposits	$ 11,346,835		$ 11,346,835		$ 12,795,224
Total full-time equivalent employees | employee	325		325		284
Operating Segments | Community Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 109,948	99,512	$ 306,966	297,852
Non-interest revenue	11,768	12,963	37,819	36,055
Non-interest expense	33,545	30,169	97,671	85,234
Pre-provision net revenue	88,171	82,306	247,114	248,673
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	8,232,482		8,232,482		$ 8,231,451
Total deposits	$ 11,227,390		$ 11,227,390		$ 12,557,631
Total full-time equivalent employees | employee	623		623		617
Operating Segments | Consumer Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 125,421	100,502	$ 326,553	311,285
Non-interest revenue	21,498	20,758	65,236	59,632
Non-interest expense	48,234	43,620	139,859	130,482
Pre-provision net revenue	98,685	77,640	251,930	240,435
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	2,887,964		2,887,964		$ 2,559,892
Total deposits	$ 19,394,060		$ 19,394,060		$ 19,668,846
Total full-time equivalent employees | employee	1,510		1,510		1,522
Operating Segments | Financial Management Services
Income Statement Related Disclosures [Abstract]
Net interest income	$ 17,076	19,964	$ 52,895	59,603
Non-interest revenue	46,615	51,248	136,975	162,176
Non-interest expense	42,620	44,999	131,023	139,383
Pre-provision net revenue	21,071	26,213	58,847	82,396
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	5,104,400		5,104,400		$ 4,994,494
Total deposits	$ 124,208		$ 124,208		$ 401,969
Total full-time equivalent employees | employee	799		799		794
Treasury and Corporate Other
Income Statement Related Disclosures [Abstract]
Net interest income	$ 47,630	26,165	$ 105,313	62,629
Non-interest revenue	14,627	19,247	39,394	50,076
Non-interest expense	139,723	125,730	396,328	385,008
Pre-provision net revenue	(77,466)	$ (80,318)	(251,621)	$ (272,303)
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	1,732,301		1,732,301		$ 2,030,071
Total deposits	$ 5,605,071		$ 5,605,071		$ 4,003,606
Total full-time equivalent employees | employee	1,776		1,776		1,670