Quarterly Data - Schedule of Quarterly Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interest and dividend income	$ 5,900,000	$ 5,640,000	$ 5,292,000	$ 5,062,000	$ 5,018,000	$ 4,859,000	$ 4,767,000	$ 4,502,000
Interest expense	1,116,000	867,000	725,000	614,000	559,000	472,000	435,000	436,000	$ 3,322,414	$ 1,902,165	$ 1,612,093
Net interest income	4,784,000	4,773,000	4,567,000	4,448,000	4,459,000	4,387,000	4,332,000	4,066,000	18,571,758	17,244,149	15,801,015
Provision for loan losses	226,000	249,000	140,000	215,000	75,000	75,000	75,000	75,000	829,500	300,000	160,000
Net interest income after provision for loan losses	4,558,000	4,524,000	4,427,000	4,233,000	4,384,000	4,312,000	4,257,000	3,991,000	17,742,258	16,944,149	15,641,015
Noninterest income	1,175,000	978,000	1,060,000	994,000	960,000	969,000	1,100,000	1,283,000	4,206,731	4,312,522	4,459,259
Noninterest expenses	4,357,000	4,149,000	4,132,000	3,996,000	3,892,000	4,068,000	3,968,000	3,901,000	16,633,454	15,829,279	14,913,821
Income before income taxes	1,376,000	1,353,000	1,355,000	1,231,000	1,452,000	1,213,000	1,389,000	1,373,000
Provision for income taxes	253,000	209,000	207,000	(1,000)	735,000	261,000	316,000	308,000	668,416	1,619,900	1,152,476
Net income	$ 1,123,000	$ 1,144,000	$ 1,148,000	$ 1,232,000	$ 717,000	$ 952,000	$ 1,073,000	$ 1,065,000	$ 4,647,119	$ 3,807,492	$ 4,033,977
Basic	$ 0.44	$ 0.45	$ 0.45	$ 0.48	$ 0.28	$ 0.37	$ 0.42	$ 0.42	$ 1.83	$ 1.49	$ 1.58
Diluted	$ 0.44	$ 0.45	$ 0.45	$ 0.48	$ 0.28	$ 0.37	$ 0.42	$ 0.42	$ 1.83	$ 1.49	$ 1.58