Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) employee segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) employee
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Segment Reporting Information [Line Items]
Number of reportable segments | segment	4
Income Statement Related Disclosures [Abstract]
Net interest income	$ 392,248	$ 373,857
Non-interest revenue	105,334	110,956
Non-interest expense	272,450	267,134
Pre-provision net revenue	225,132	217,679
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	40,169,150		$ 39,311,958
Total deposits	$ 48,656,244		$ 49,427,276
Total full-time equivalent employees | employee	4,907		4,887
Operating Segments | Wholesale Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 157,477	134,074
Non-interest revenue	8,398	7,319
Non-interest expense	26,648	20,724
Pre-provision net revenue	139,227	120,669
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	22,393,060		$ 21,496,050
Total deposits	$ 11,921,931		$ 12,370,554
Total full-time equivalent employees | employee	292		284
Operating Segments | Community Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 97,321	99,140
Non-interest revenue	13,583	10,620
Non-interest expense	30,420	26,920
Pre-provision net revenue	80,484	82,840
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	8,319,687		$ 8,231,451
Total deposits	$ 12,589,784		$ 12,557,631
Total full-time equivalent employees | employee	596		607
Operating Segments | Consumer Banking
Income Statement Related Disclosures [Abstract]
Net interest income	$ 97,556	107,102
Non-interest revenue	21,644	19,134
Non-interest expense	44,715	43,556
Pre-provision net revenue	74,485	82,680
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	2,580,858		$ 2,559,892
Total deposits	$ 20,115,909		$ 19,668,846
Total full-time equivalent employees | employee	1,553		1,532
Operating Segments | Financial Management Services
Income Statement Related Disclosures [Abstract]
Net interest income	$ 18,444	20,995
Non-interest revenue	45,164	58,583
Non-interest expense	44,139	47,674
Pre-provision net revenue	19,469	31,904
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	4,991,359		$ 4,994,494
Total deposits	$ 818,297		$ 826,639
Total full-time equivalent employees | employee	788		794
Treasury and Corporate Other
Income Statement Related Disclosures [Abstract]
Net interest income	$ 21,450	12,546
Non-interest revenue	16,545	15,300
Non-interest expense	126,528	128,260
Pre-provision net revenue	(88,533)	$ (100,414)
Balance Sheet Related Disclosures [Abstract]
Loans, net of deferred fees and costs	1,884,186		$ 2,030,071
Total deposits	$ 3,210,323		$ 4,003,606
Total full-time equivalent employees | employee	1,678		1,670