Short-Term Borrowings - Maturities of Securities Sold under Agreements to Repurchase (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Securities sold under agreements to repurchase
Weighted-average remaining maturity of agreements	349 days
Securities sold under agreements to repurchase	$ 9,151
Less than 30 days
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	1,200
30 through 90 days
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	2,000
Maturing Over 90 days
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	$ 5,951