Short-Term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Short-term Debt [Abstract]
Federal Funds Purchased	$ 1,300	$ 49,982
Securities Sold under Agreements to Repurchase	22,214	31,007
Short-term borrowings	$ 23,514	$ 80,989