Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income
Interest and fees on loans	$ 25,525,000	$ 24,356,000	$ 22,759,000
Interest and dividends on investment securities (AFS & HTM):
Taxable	5,454,000	5,219,000	5,406,000
Tax-exempt	1,949,000	2,009,000	2,223,000
Interest on trading securities	138,000	163,000	158,000
Interest on interest-bearing balances and other interest income	171,000	128,000	124,000
Total interest income	33,237,000	31,875,000	30,670,000
Interest on deposits
Interest-bearing demand	666,000	678,000	673,000
Money market	192,000	158,000	126,000
Savings	923,000	806,000	770,000
Time	1,497,000	1,548,000	1,636,000
Time of $100 or more	1,301,000	1,199,000	1,155,000
Interest on short-term borrowings	154,000	117,000	114,000
Interest on long-term debt			70,000
Total interest expense	4,733,000	4,506,000	4,544,000
Net interest income	28,504,000	27,369,000	26,126,000
Provision for loan losses	30,000	200,000	400,000
Net interest income after provision for loan losses	28,474,000	27,169,000	25,726,000
Non-interest income
Total other-than-temporary impairment loss on investment securities	(192,000)	(55,000)	0
Net other-than temporary impairment losses on investment securities	(192,000)	(55,000)
Net gain on sale of investment securities	866,000	838,000	1,112,000
Net gain on investment securities	674,000	783,000	1,112,000
Net (loss) gain on trading activities	(40,000)	33,000	156,000
Fees for services to customers	1,621,000	1,657,000	1,687,000
ATM and debit card	1,651,000	1,571,000	1,485,000
Retail brokerage and advisory	603,000	686,000	657,000
Bank-owned life insurance	308,000	307,000	472,000
Merchant	334,000	298,000	299,000
Net gain on sale of loans	320,000	356,000	258,000
Loss on sale of indirect lease financing portfolio	(223,000)
Gain on sale of internet domain name			1,000,000
Other	419,000	341,000	416,000
Total non-interest income	5,667,000	6,032,000	7,542,000
Non-interest expense
Salaries and employee benefits	12,011,000	12,076,000	11,649,000
Net occupancy	1,750,000	1,762,000	1,705,000
Furniture and equipment	1,753,000	1,726,000	1,753,000
Marketing	806,000	805,000	841,000
Third party services	1,691,000	1,703,000	1,677,000
Telephone, postage and supplies	752,000	731,000	730,000
State taxes	666,000	681,000	617,000
FDIC insurance premiums	568,000	631,000	686,000
Other	2,166,000	2,283,000	1,968,000
Total non-interest expense	22,163,000	22,398,000	21,626,000
Income before income taxes	11,978,000	10,803,000	11,642,000
Provision for income taxes	3,054,000	2,570,000	2,644,000
Net income	$ 8,924,000	$ 8,233,000	$ 8,998,000
Earnings per share - basic	$ 2.64	$ 2.47	$ 2.73
Earnings per share - diluted	2.63	2.46	2.72
Cash dividends per share	$ 1.20	$ 1.16	$ 1.12