Loans, Leases and Allowance for Credit Losses - Disaggregation of the Company's ACL on Funded Loans and Loan Balances (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	$ 58,192.0	$ 52,817.0
Individually Evaluated for Credit Loss	485.0	859.0
Loans HFI, net of deferred fees and costs	58,677.0	53,676.0
Collectively Evaluated for Credit Loss	396.4	304.5
Individually Evaluated for Credit Loss	64.2	69.3
Total	460.6	373.8	$ 336.7
Mortgage finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	7,271.0	6,151.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	7,271.0	6,151.0
Collectively Evaluated for Credit Loss	5.5	4.8
Individually Evaluated for Credit Loss	0.0	0.0
Total	5.5	4.8	4.2
Municipal & nonprofit
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	1,643.0	1,615.0
Individually Evaluated for Credit Loss	5.0	5.0
Loans HFI, net of deferred fees and costs	1,648.0	1,620.0
Collectively Evaluated for Credit Loss	12.8	14.1
Individually Evaluated for Credit Loss	0.2	0.6
Total	13.0	14.7	14.7
Tech & innovation
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	4,108.0	3,283.0
Individually Evaluated for Credit Loss	20.0	100.0
Loans HFI, net of deferred fees and costs	4,128.0	3,383.0
Collectively Evaluated for Credit Loss	44.1	33.6
Individually Evaluated for Credit Loss	0.7	22.3
Total	44.8	55.9	42.1
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	1,233.0	884.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	1,233.0	884.0
Collectively Evaluated for Credit Loss	2.6	1.6
Individually Evaluated for Credit Loss	0.0	0.0
Total	2.6	1.6	1.3
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	13,671.0	11,103.0
Individually Evaluated for Credit Loss	118.0	128.0
Loans HFI, net of deferred fees and costs	13,789.0	11,231.0
Collectively Evaluated for Credit Loss	139.0	77.1
Individually Evaluated for Credit Loss	45.7	2.3
Total	184.7	79.4	83.0
CRE - owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	1,530.0	1,658.0
Individually Evaluated for Credit Loss	3.0	17.0
Loans HFI, net of deferred fees and costs	1,533.0	1,675.0
Collectively Evaluated for Credit Loss	3.4	3.4
Individually Evaluated for Credit Loss	0.0	0.0
Total	3.4	3.4	6.0
Hotel franchise finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	4,185.0	3,786.0
Individually Evaluated for Credit Loss	0.0	29.0
Loans HFI, net of deferred fees and costs	4,185.0	3,815.0
Collectively Evaluated for Credit Loss	37.7	35.3
Individually Evaluated for Credit Loss	0.0	0.0
Total	37.7	35.3	33.4
Other CRE - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	6,227.0	5,830.0
Individually Evaluated for Credit Loss	228.0	512.0
Loans HFI, net of deferred fees and costs	6,455.0	6,342.0
Collectively Evaluated for Credit Loss	92.8	90.3
Individually Evaluated for Credit Loss	17.6	44.1
Total	110.4	134.4	96.0
Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	13,403.0	12,961.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	13,403.0	12,961.0
Collectively Evaluated for Credit Loss	23.7	19.7
Individually Evaluated for Credit Loss	0.0	0.0
Total	23.7	19.7	23.1
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	828.0	972.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	828.0	972.0
Collectively Evaluated for Credit Loss	0.0	0.0
Individually Evaluated for Credit Loss	0.0	0.0
Total	0.0	0.0	0.0
Construction and land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	3,934.0	4,401.0
Individually Evaluated for Credit Loss	109.0	67.0
Loans HFI, net of deferred fees and costs	4,043.0	4,468.0
Collectively Evaluated for Credit Loss	32.3	21.3
Individually Evaluated for Credit Loss	0.0	0.0
Total	32.3	21.3	30.4
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	159.0	173.0
Individually Evaluated for Credit Loss	2.0	1.0
Loans HFI, net of deferred fees and costs	161.0	174.0
Collectively Evaluated for Credit Loss	2.5	3.3
Individually Evaluated for Credit Loss	0.0	0.0
Total	$ 2.5	$ 3.3	$ 2.5