Quarterly Data - Summary of Quarterly Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Interest and dividend income	$ 3,946,000	$ 3,889,000	$ 3,898,000	$ 3,695,000	$ 3,710,000	$ 3,722,000	$ 3,726,000	$ 3,554,000
Interest expense	353,000	325,000	324,000	315,000	314,000	306,000	334,000	401,000	$ 1,316,808	$ 1,355,459	$ 1,662,957
Net interest income	3,593,000	3,564,000	3,574,000	3,380,000	3,396,000	3,416,000	3,392,000	3,153,000	14,111,519	13,356,745	12,811,906
Provision for loan losses	0	51,000	45,000	45,000	75,000	75,000	75,000	105,000	141,300	330,000	420,000
Net interest income after provision for loan losses	3,593,000	3,513,000	3,529,000	3,335,000	3,321,000	3,341,000	3,317,000	3,048,000	13,970,219	13,026,745	12,391,906
Noninterest income	1,046,000	1,008,000	1,045,000	1,161,000	1,115,000	1,283,000	1,246,000	1,342,000	4,260,177	4,986,438	5,091,171
Noninterest expenses	3,590,000	3,459,000	3,493,000	3,487,000	3,625,000	3,612,000	3,630,000	3,503,000	14,029,597	14,369,796	14,346,069
Income before income taxes	1,049,000	1,062,000	1,081,000	1,009,000	811,000	1,012,000	933,000	887,000
Provision for income taxes	206,000	205,000	216,000	200,000	149,000	208,000	196,000	186,000	827,164	739,557	364,664
Net income	$ 843,000	$ 857,000	$ 865,000	$ 809,000	$ 662,000	$ 804,000	$ 737,000	$ 701,000	$ 3,373,635	$ 2,903,830	$ 2,772,344
Basic	$ 0.33	$ 0.33	$ 0.34	$ 0.32	$ 0.26	$ 0.32	$ 0.28	$ 0.28	$ 1.32	$ 1.14	$ 1.09
Diluted	$ 0.33	$ 0.33	$ 0.34	$ 0.32	$ 0.26	$ 0.32	$ 0.28	$ 0.28	$ 1.32	$ 1.14	$ 1.09