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Short-Term Borrowings (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Short-Term Borrowings (Details) [Line Items]    
Purchases of federal funds $ 41.0 $ 5.0
Retail Repurchase Agreements [Member]    
Short-Term Borrowings (Details) [Line Items]    
Mortgage-backed securities maturity, basis of allocation description These securities have various maturity dates from 2024 through 2061.  
Total secured securities $ 27.5  
Short-term borrowings mature, description The REPO agreements mature within one month.