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Short-Term Borrowings (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Short-Term Borrowings (Details) [Line Items]    
Borrowed pledging securities as collateral $ 20.0  
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 2022 through 2044.  
Secured by agency securities with corresponding liabilities $ 10.4  
Secured by mortgage-backed securities with corresponding liabilities $ 14.4  
Short-term borrowings mature term The repurchase agreements mature within one month.  
Federal funds lines $ 41.0 $ 41.0