Segment Reporting - Schedule of Financing Receivables by Segment (Details) $ in Thousands	Sep. 30, 2025 USD ($) employee	Dec. 31, 2024 USD ($) employee
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 43,753,234	$ 42,609,028
Deposits	$ 50,003,729	$ 51,095,359
Full-time equivalent employees \| employee	4,847	4,696
Operating Segments \| Wholesale Banking
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 25,821,429	$ 24,677,119
Deposits	$ 14,319,619	$ 15,207,166
Full-time equivalent employees \| employee	355	336
Operating Segments \| Community Banking
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 8,075,467	$ 7,921,182
Deposits	$ 11,126,772	$ 10,877,394
Full-time equivalent employees \| employee	552	533
Operating Segments \| Consumer Banking
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 2,603,853	$ 2,776,305
Deposits	$ 17,585,811	$ 18,365,142
Full-time equivalent employees \| employee	1,524	1,491
Operating Segments \| Financial Management Services
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 5,210,585	$ 5,263,474
Deposits	$ 1,298,703	$ 1,109,270
Full-time equivalent employees \| employee	553	565
Treasury and Corporate Other
Segment Reporting Information [Line Items]
Loans, net of deferred fees and costs	$ 2,041,900	$ 1,970,948
Deposits	$ 5,672,824	$ 5,536,387
Full-time equivalent employees \| employee	1,863	1,771