Borrowings Federal Funds Purchased, Securities Sold Under Agreements to Repurchase and Short-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	$ 26,869	$ 38,551
Weighted-average interest rate at year-end	0.01%	0.80%
Maximum amount outstanding at any month's end	$ 34,253	$ 43,989
Average amount outstanding during the year	$ 30,095	$ 37,035
Weighted-average interest rate during the year	0.21%	0.86%