Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest and dividend income:
Interest and fees on loans	$ 36,044	$ 35,605
Interest and dividends on securities available for sale:
U. S. government sponsored enterprises	595	255
State and political subdivisions	12	14
Mortgage-backed securities and collateralized mortgage obligations-residential	1,958	2,116
Corporate bonds	151	0
Small Business Administration-guaranteed participation securities	415	476
Mortgage-backed securities and collateralized mortgage obligations-commercial	23	36
Other securities	4	4
Total interest and dividends on securities available for sale	3,158	2,901
Interest on held to maturity securities:
Mortgage-backed securities and collateralized mortgage obligations-residential	316	402
Corporate bonds	154	154
Total interest on held to maturity securities	470	556
Federal Reserve Bank and Federal Home Loan Bank stock	134	120
Interest on federal funds sold and other short-term investments	1,246	844
Total interest income	41,052	40,026
Interest on deposits:
Interest-bearing checking	124	114
Savings	430	604
Money market deposit accounts	466	496
Time deposits	2,283	2,373
Interest on short-term borrowings	349	257
Total interest expense	3,652	3,844
Net interest income	37,400	36,182
Provision for loan losses	600	800
Net interest income after provision for loan losses	36,800	35,382
Noninterest income:
Trustco financial services income	1,858	1,605
Fees for services to customers	2,637	2,661
Other	232	306
Total noninterest income	4,727	4,572
Noninterest expenses:
Salaries and employee benefits	10,210	9,003
Net occupancy expense	4,109	4,088
Equipment expense	1,556	1,514
Professional services	1,928	2,146
Outsourced services	1,500	1,551
Advertising expense	713	729
FDIC and other insurance	1,047	1,990
Other real estate expense, net	499	519
Other	2,457	1,899
Total noninterest expenses	24,019	23,439
Income before taxes	17,508	16,515
Income taxes	6,561	6,106
Net income	$ 10,947	$ 10,409
Net income per share:
Basic (in dollars per share)	$ 0.114	$ 0.109
Diluted (in dollars per share)	$ 0.114	$ 0.109