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Short-term Borrowings (Summary of Various Sources of Short-Term Borrowed Funds) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Balance at year end $ 0 $ 43,100,000
Federal Funds Purchased [Member]    
Short-term Debt [Line Items]    
Maximum month-end balance 37,573,000 35,050,000
Average daily balance during the year $ 3,739,000 $ 7,049,000
Weighted average rate during the year 2.97% 2.24%
FHLB Short-Term Borrowings [Member]    
Short-term Debt [Line Items]    
Balance at year end   $ 43,100,000
Weighted average rate at year end   2.74%
Maximum month-end balance $ 54,667,000 $ 43,100,000
Average daily balance during the year $ 12,819,000 $ 1,784,000
Weighted average rate during the year 2.80% 2.74%