Segment Reporting - Schedule of Financing Receivables by Segment (Details) $ in Thousands	Mar. 31, 2025 USD ($) employee	Dec. 31, 2024 USD ($) employee
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 42,648,738	$ 42,609,028
Deposits	$ 50,843,061	$ 51,095,359
Full-time equivalent employees \| employee	4,720	4,696
Operating Segments \| Wholesale Banking
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 24,766,893	$ 24,677,119
Deposits	$ 14,864,688	$ 15,207,166
Full-time equivalent employees \| employee	345	336
Operating Segments \| Community Banking
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 7,909,624	$ 7,921,182
Deposits	$ 10,980,833	$ 10,877,394
Full-time equivalent employees \| employee	541	533
Operating Segments \| Consumer Banking
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 2,719,333	$ 2,776,305
Deposits	$ 18,206,523	$ 18,365,142
Full-time equivalent employees \| employee	1,484	1,475
Operating Segments \| Financial Management Services
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 5,241,567	$ 5,263,474
Deposits	$ 1,190,175	$ 1,109,270
Full-time equivalent employees \| employee	560	565
Treasury and Corporate Other
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 2,011,321	$ 1,970,948
Deposits	$ 5,600,842	$ 5,536,387
Full-time equivalent employees \| employee	1,790	1,787