Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Interest and fees on loans	$ 34,275,000	$ 29,761,000	$ 25,800,000
Interest on investment securities:
Taxable	3,487,000	3,099,000	1,791,000
Exempt from Federal income taxes	908,000	852,000	688,000
Other	632,000	610,000	674,000
Total interest income	39,302,000	34,322,000	28,953,000
Interest expense:
Interest on deposits	1,201,000	716,000	582,000
Interest on note payable			28,000
Interest on junior subordinated deferrable interest debentures	531,000	510,000	401,000
Other	15,000	10,000	6,000
Total interest expense	1,747,000	1,236,000	1,017,000
Net interest income before provision for loan losses	37,555,000	33,086,000	27,936,000
Provision for loan losses	1,500,000	1,000,000	600,000
Net interest income after provision for loan losses	36,055,000	32,086,000	27,336,000
Non-interest income:
Service charges	2,695,000	2,576,000	2,467,000
Interchange revenue	2,374,000	2,174,000	1,987,000
Gain on sale of loans	867,000	1,903,000	2,039,000
Gain (loss) on sale of investment securities	114,000	(8,000)	(158,000)
Earnings on bank owned life insurance policies, net	328,000	328,000	338,000
Other	997,000	1,108,000	876,000
Total non-interest income	8,135,000	8,881,000	8,280,000
Non-interest expenses:
Salaries and employee benefits	13,009,000	12,138,000	11,505,000
Occupancy and equipment	3,311,000	2,962,000	2,840,000
Other	6,490,000	6,741,000	5,766,000
Total non-interest expenses	22,810,000	21,841,000	20,111,000
Income before income taxes	21,380,000	19,126,000	15,505,000
Provision for income taxes	5,868,000	5,134,000	7,316,000
Net income	$ 15,512,000	$ 13,992,000	$ 8,189,000
Basic earnings per common share (in dollars per share)	$ 3.01	$ 2.74	$ 1.64
Diluted earnings per common share (in dollars per share)	2.97	2.68	1.58
Common dividends per share (in dollars per share)	$ 0.46	$ 0.36	$ 0.28
Bank Servicing [Member]
Non-interest income:
Service charges	$ 760,000	$ 800,000	$ 731,000