Securities - Additional Information (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Securities Pledged
Securities pledged to various federal reserve districts, amortized cost	$ 54,600,000	$ 38,200,000
Securities pledged to various federal reserve districts, fair value	54,500,000	37,500,000
Repurchase Agreements [Member]
Securities Pledged
Amortized cost of securities pledged	16,300,000	10,300,000
Securities pledged and available to be sold under repurchase agreements, fair value	16,500,000	10,500,000
Derivative [Member]
Securities Pledged
Amortized cost of securities pledged	1,800,000	895,000
Securities pledged and available to be sold under repurchase agreements, fair value	$ 1,900,000	$ 929,000