v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt securities available for sale $ 3,775 $ 3,727
Debt securities held to maturity 3,972 3,941
Net loans and leases, including loans held for sale 91 85
Derivative assets 103 122
Long-term borrowings 641  
Derivative liabilities 195 208
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,659 2,498
Debt securities available for sale 354 356
Debt securities held to maturity 0 0
Net loans and leases, including loans held for sale 0 0
Loan servicing rights 0 0
Derivative assets 0 0
Accrued interest receivable 164 163
Deposits 31,494 31,451
Short-term borrowings 2,156 2,018
Long-term borrowings 0 0
Derivative liabilities 0 0
Accrued interest payable 55 50
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Debt securities available for sale 3,421 3,371
Debt securities held to maturity 3,972 3,941
Net loans and leases, including loans held for sale 317 514
Loan servicing rights 0 0
Derivative assets 99 115
Accrued interest receivable 0 0
Deposits 7,378 7,285
Short-term borrowings 0 0
Long-term borrowings 1,200 1,103
Derivative liabilities 194 208
Accrued interest payable 0 0
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Debt securities available for sale 0 0
Debt securities held to maturity 0 0
Net loans and leases, including loans held for sale 34,223 33,806
Loan servicing rights 94 90
Derivative assets 4 7
Accrued interest receivable 0 0
Deposits 0 0
Short-term borrowings 0 0
Long-term borrowings 804 817
Derivative liabilities 1 0
Accrued interest payable 0 0
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,659 2,498
Debt securities available for sale 3,775 3,727
Debt securities held to maturity 4,183 4,117
Net loans and leases, including loans held for sale 34,990 34,853
Loan servicing rights 76 75
Derivative assets 103 122
Accrued interest receivable 164 163
Deposits 38,901 38,759
Short-term borrowings 2,157 2,017
Long-term borrowings 2,001 1,901
Derivative liabilities 195 208
Accrued interest payable 55 50
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,659 2,498
Debt securities available for sale 3,775 3,727
Debt securities held to maturity 3,972 3,941
Net loans and leases, including loans held for sale 34,540 34,320
Loan servicing rights 94 90
Derivative assets 103 122
Accrued interest receivable 164 163
Deposits 38,872 38,736
Short-term borrowings 2,156 2,018
Long-term borrowings 2,004 1,920
Derivative liabilities 195 208
Accrued interest payable $ 55 $ 50