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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Major Portfolio Segment and Specific Loan Class) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans held for sale | $ 172 | $ 74
Total loans and leases | 60,833 | 59,410
Commercial: |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 31,646 | 30,965
Commercial: | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 17,526 | 16,891
Commercial: | Owner-occupied |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 9,377 | 9,333
Commercial: | Municipal |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 4,376 | 4,364
Commercial: | Leasing |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 367 | 377
Commercial real estate: |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 13,611 | 13,477
Commercial real estate: | Term |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 11,186 | 10,703
Commercial real estate: | Construction and land development |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 2,425 | 2,774
Consumer: |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 15,576 | 14,968
Consumer: | 1-4 family residential |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 10,431 | 9,939
Consumer: | Home equity credit line |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 3,784 | 3,641
Consumer: | Construction and other consumer real estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 743 | 810
Consumer: | Bankcard and other revolving plans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | 496 | 457
Consumer: | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans and leases | $ 122 | $ 121

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