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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Net unamortized purchase premiums, discounts, and deferred loan fees and cost | $ 56,000,000 |  | $ 56,000,000 |  | $ 43,000,000
Accrued interest receivable | $ 278,000,000 |  | $ 278,000,000 |  | $ 281,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets |  | Other assets |  | Other assets
Total loans | $ 60,302,000,000 |  | $ 60,302,000,000 |  | $ 59,410,000,000
Loans held for sale | 215,000,000 |  | 215,000,000 |  | 74,000,000
Principal balance of loans sold, serviced loans | 702,000,000 |  | 702,000,000 |  | 615,000,000
Total income from loans sold | 4,000,000 | $ 2,000,000 | 9,000,000 | $ 5,000,000 |
Interest income | 0 | 0 | 0 | 0 |
Financing receivable, commitments threshold for risk classification approach | 1,000,000 |  | 1,000,000 |  |
Real estate acquired through foreclosure (prior year less than) | 1,000,000 |  | 1,000,000 |  | 1,000,000
Mortgage loans in process of foreclosure | 21,000,000 |  | 21,000,000 |  | 14,000,000
Nonaccrual |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, commitments threshold for evaluating individually | 1,000,000 |  | 1,000,000 |  |
Doubtful |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans |  |  |  |  | 14,000,000
Doubtful | Maximum |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | 10,000,000 |  | 10,000,000 |  |
Payment deferral |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Modified, still in default (prior year approximately) | 2,000,000 | 5,000,000 | 4,000,000 | 5,000,000 |
Principal forgiveness |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Modified, principal forgiveness (current year approximately, prior year less than) | 2,000,000 | $ 1,000,000 | 2,000,000 | $ 1,000,000 |
Asset Pledged as Collateral without Right |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans held for sale | 42,600,000,000 |  | 42,600,000,000 |  | 40,400,000,000
Commercial: |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | 31,179,000,000 |  | 31,179,000,000 |  | 30,965,000,000
Commercial real estate: |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | 13,477,000,000 |  | 13,477,000,000 |  | 13,477,000,000
Consumer: |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | 15,646,000,000 |  | 15,646,000,000 |  | 14,968,000,000
Land Acquisition and Development | Commercial real estate: |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | 234,000,000 |  | 234,000,000 |  | 260,000,000
Commercial and industrial | Commercial: |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | 17,222,000,000 |  | 17,222,000,000 |  | 16,891,000,000
Commercial and industrial | Commercial: | Nonaccrual |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans | $ 107,000,000 |  | $ 107,000,000 |  | $ 114,000,000

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