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Borrowings (Average balance and rates) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Federal Home Loan Bank Balance at End of Period $ 3,100,000 $ 3,750,000
Federal Home Loan Bank Average Balance During the Period 2,430,874 4,458,463
Federal Home Loan Bank Maximum Month End Balance During Period $ 3,100,000 $ 6,400,000
Federal Home Loan Bank Weighted average rate at December 31 5.00% 5.60%
Federal Home Loan Bank Weighted average rate during period 5.20% 5.30%
FRB Bank Team Funding Program | Federal Reserve Bank Advances    
Line of Credit Facility [Line Items]    
Other Short-Term Borrowings $ 0 $ 200,000
Other Short Term borrowings, Activity for Year, Average Balance Outstanding 1,260,656 31,918
Other Short-term Borrowings, Activity for Year, Maximum month end balance during period $ 1,550,000 $ 200,000
FRB Bank Team Funding Program | Federal Reserve Bank Advances | Weighted Average    
Line of Credit Facility [Line Items]    
Other short-term borrowings, Activity for Year, Average Interest Rate at Period End 0 0.048
Federal Reserve Bank Weighted Average Rate During Period 0.048 0.048