Short-term Borrowings (Details)	Dec. 31, 2016 USD ($) bank	Dec. 31, 2015 USD ($)
Short-term Debt [Abstract]
Federal funds line of credit, number of banks | bank	2
Federal funds line of credit, amount per agreement	$ 15,000,000
Customer repurchase agreements	39,166,000	$ 40,611,000
Other short-term borrowings	20,000,000	0
Short-term borrowings	$ 59,166,000	$ 40,611,000
Customer repurchase agreements, Weighted Average Rate	0.01%	0.02%
Short-term borrowings, Weighted Average Rate	0.80%	0.00%