Condensed Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Loans, including fees	$ 37,005,000	$ 32,918,000	$ 109,559,000	$ 97,087,000
Securities, taxable	2,104,000	1,718,000	5,930,000	4,938,000
Securities, tax-exempt	556,000	537,000	1,657,000	1,690,000
Other interest-earning assets	651,000	313,000	1,627,000	1,071,000
Total interest income	40,316,000	35,486,000	118,773,000	104,786,000
Interest expense
Deposits	5,573,000	3,574,000	15,906,000	9,921,000
Short-term borrowings	71,000	63,000	244,000	181,000
Federal Home Loan Bank advances	2,257,000	1,201,000	6,751,000	3,134,000
Subordinated debentures and other borrowings	810,000	808,000	2,506,000	2,286,000
Total interest expense	8,711,000	5,646,000	25,407,000	15,522,000
Net interest income	31,605,000	29,840,000	93,366,000	89,264,000
Provision for loan losses	700,000	400,000	2,450,000	1,100,000
Net interest income after provision for loan losses	30,905,000	29,440,000	90,916,000	88,164,000
Noninterest income:
Mortgage banking income	2,889,000	1,235,000	5,291,000	3,115,000
Earnings on bank owned life insurance	330,000	318,000	3,567,000	969,000
Payroll services income	367,000	328,000	1,227,000	1,128,000
Other income	358,000	322,000	1,755,000	1,213,000
Total noninterest income	6,676,000	4,708,000	19,643,000	13,639,000
Noninterest expense
Salaries and benefits	13,680,000	12,932,000	39,982,000	38,027,000
Occupancy	1,697,000	1,648,000	5,089,000	5,049,000
Furniture and equipment depreciation, rent and maintenance	629,000	659,000	1,885,000	1,789,000
Data processing costs	2,342,000	2,150,000	6,854,000	6,415,000
Other expense	3,679,000	4,261,000	12,134,000	12,931,000
Total noninterest expenses	22,027,000	21,650,000	65,944,000	64,211,000
Income before federal income tax expense	15,554,000	12,498,000	44,615,000	37,592,000
Federal income tax expense	2,954,000	2,375,000	8,476,000	7,142,000
Net income	$ 12,600,000	$ 10,123,000	$ 36,139,000	$ 30,450,000
Basic earnings per share (in dollars per share)	$ 0.77	$ 0.61	$ 2.20	$ 1.83
Diluted earnings per share (in dollars per share)	0.77	0.61	2.20	1.83
Cash dividends per share (in dollars per share)	$ 0.27	$ 0.24	$ 0.79	$ 0.68
Average basic shares outstanding (in shares)	16,390,203	16,611,411	16,415,843	16,602,701
Average diluted shares outstanding (in shares)	16,393,078	16,619,295	16,420,845	16,610,544
Deposit Account [Member]
Noninterest income:
Noninterest income	$ 1,185,000	$ 1,127,000	$ 3,406,000	$ 3,259,000
Credit and Debit Card [Member]
Noninterest income:
Noninterest income	$ 1,547,000	$ 1,378,000	$ 4,397,000	$ 3,955,000