BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Oct. 20, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Liabilities assumed
Preliminary goodwill		$ 5,997	$ 5,561	$ 5,561
Veritex Holdings, Inc.
Purchase consideration
Cash	$ 2
Total consideration	1,684
Assets acquired
Cash and due from banks	19
Interest-earning deposits with banks	943
Available-for-sale securities	1,274
Other securities	76
Loans held for sale	83
Loans and leases	9,300
Allowance for loan and lease losses	(143)
Net loans and leases	9,157
Bank owned life insurance	87
Premises and equipment	135
Servicing rights and other intangible assets	105
Other assets	147
Total assets acquired	12,026
Liabilities assumed
Deposits	10,516
Long-term debt	159
Other liabilities	117
Total liabilities assumed	10,792
Preliminary fair value of net assets acquired	1,234
Preliminary goodwill	450
Veritex Holdings, Inc. | Common Stock
Purchase consideration
Fair value of equity interest	1,659
Veritex Holdings, Inc. | Equity-based Awards
Purchase consideration
Fair value of equity interest	$ 23