Securities - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Securities Pledged
Average loss on securities, percent	0.55%	0.96%
Securities pledged to various federal reserve districts, amortized cost	$ 97,300	$ 55,000
Securities pledged to various federal reserve districts, fair value	97,100	54,800
Repurchase Agreements [Member]
Securities Pledged
Amortized cost of securities pledged	14,900	17,700
Securities pledged and available to be sold under repurchase agreements, fair value	15,000	17,900
Derivative [Member]
Securities Pledged
Amortized cost of securities pledged	2,800	669
Securities pledged and available to be sold under repurchase agreements, fair value	$ 2,900	$ 701