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Borrowed Funds (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Carrying value of securities sold under agreements to repurchase $ 32,933 $ 54,898
Short-term Debt [Line Items]    
Additional borrowing capacity $ 153,347  
Federal Funds Purchased [Member] | Minimum [Member]    
Short-term Debt [Line Items]    
Debt instrument, term 1 day  
Federal Funds Purchased [Member] | Maximum [Member]    
Short-term Debt [Line Items]    
Debt instrument, term 4 days