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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt securities available for sale $ 3,620 $ 3,466
Debt securities held to maturity 3,838 3,644
Net loans and leases, including loans held for sale 78 53
Derivative assets 127 117
Long-term borrowings 741  
Derivative liabilities 218 313
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,413 2,419
Debt securities available for sale 276 274
Debt securities held to maturity 1 1
Net loans and leases, including loans held for sale 0 0
Loan servicing rights 0 0
Derivative assets 0 0
Accrued interest receivable 165 164
Deposits 30,886 29,607
Short-term borrowings 1,906 1,256
Long-term borrowings 0 0
Derivative liabilities 0 0
Accrued interest payable 62 65
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Debt securities available for sale 3,344 3,192
Debt securities held to maturity 3,837 3,643
Net loans and leases, including loans held for sale 263 214
Loan servicing rights 0 0
Derivative assets 121 116
Accrued interest receivable 0 0
Deposits 7,529 7,463
Short-term borrowings 0 0
Long-term borrowings 1,202 1,748
Derivative liabilities 218 309
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 33,927 32,434
Loan servicing rights 88 88
Derivative assets 6 1
Accrued interest receivable 0 0
Deposits 0 0
Short-term borrowings 0 0
Long-term borrowings 812 1,256
Derivative liabilities 0 4
Accrued interest payable 0 0
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,413 2,419
Debt securities available for sale 3,620 3,466
Debt securities held to maturity 4,049 3,979
Net loans and leases, including loans held for sale 34,798 33,734
Loan servicing rights 75 72
Derivative assets 127 117
Accrued interest receivable 165 164
Deposits 38,441 37,107
Short-term borrowings 1,905 1,256
Long-term borrowings 2,099 3,012
Derivative liabilities 218 313
Accrued interest payable 62 65
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,413 2,419
Debt securities available for sale 3,620 3,466
Debt securities held to maturity 3,838 3,644
Net loans and leases, including loans held for sale 34,190 32,648
Loan servicing rights 88 88
Derivative assets 127 117
Accrued interest receivable 165 164
Deposits 38,415 37,070
Short-term borrowings 1,906 1,256
Long-term borrowings 2,014 3,004
Derivative liabilities 218 313
Accrued interest payable $ 62 $ 65