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Short-term Borrowings Short-term Borrowings (Narrative) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Short-Term Debt [Abstract]  
Pledged to the FHLB as collateral for potential future borrowings - real estate related loans $ 21,900
Pledged to the FHLB as collateral for potential future borrowings - investment securities 6,600
Collateralized Borrowing with the FHLB 17,100
Pledged loans to provide collateralized borrowing with the FRB 24,600
Line of Credit Facility, Remaining Borrowing Capacity 9,500
Pledged investment securities to provide collateralized borrowing with the FRB 7,700
Discount Window, Line of Credit Facility, Current Borrowing Capacity 21,000
BTFP, Line of Credit Facility, Current Borrowing Capacity 9,300
Available collateralized borrowing with the FRB 30,300
Short Term Advances $ 3,600