Condensed Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income
Loans, including fees	$ 32,315,000	$ 26,733,000
Securities, taxable	1,602,000	1,278,000
Securities, tax-exempt	594,000	550,000
Other interest-earning assets	470,000	143,000
Total interest income	34,981,000	28,704,000
Interest expense
Deposits	3,085,000	1,868,000
Short-term borrowings	57,000	51,000
Federal Home Loan Bank advances	945,000	655,000
Subordinated debentures and other borrowings	695,000	621,000
Total interest expense	4,782,000	3,195,000
Net interest income	30,199,000	25,509,000
Provision for loan losses	0	600,000
Net interest income after provision for loan losses	30,199,000	24,909,000
Noninterest income:
Earnings on bank owned life insurance	331,000	1,738,000
Other income	870,000	866,000
Total noninterest income	4,381,000	5,851,000
Noninterest expense
Salaries and benefits	12,337,000	11,272,000
Occupancy	1,772,000	1,554,000
Furniture and equipment depreciation, rent and maintenance	548,000	535,000
Data processing costs	2,128,000	2,011,000
Other expense	4,362,000	4,404,000
Total noninterest expenses	21,147,000	19,776,000
Income before federal income tax expense	13,433,000	10,984,000
Federal income tax expense	2,552,000	3,369,000
Net income	$ 10,881,000	$ 7,615,000
Basic earnings per share (in dollars per share)	$ 0.66	$ 0.46
Diluted earnings per share (in dollars per share)	0.66	0.46
Cash dividends per common share (in dollars per share)	$ 0.22	$ 0.18
Average basic shares outstanding (in shares)	16,595,115	16,434,647
Average diluted shares outstanding (in shares)	16,604,325	16,449,210
Deposit Account [Member]
Noninterest income:
Noninterest income	$ 1,053,000	$ 1,018,000
Credit and Debit Card [Member]
Noninterest income:
Noninterest income	1,243,000	1,106,000
Mortgage Banking [Member]
Noninterest income:
Noninterest income	$ 884,000	$ 1,123,000