Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest and dividend income:
Interest and fees on loans	$ 36,662	$ 35,652	$ 72,706	$ 71,257
Interest and dividends on securities available for sale:
U. S. government sponsored enterprises	607	404	1,202	659
State and political subdivisions	11	13	23	27
Mortgage-backed securities and collateralized mortgage obligations-residential	1,944	2,169	3,902	4,285
Corporate bonds	154	0	305	0
Small Business Administration-guaranteed participation securities	394	450	809	926
Mortgage-backed securities and collateralized mortgage obligations-commercial	21	38	44	74
Other securities	4	4	8	8
Total interest and dividends on securities available for sale	3,135	3,078	6,293	5,979
Interest on held to maturity securities:
Mortgage-backed securities and collateralized mortgage obligations-residential	296	374	612	775
Corporate bonds	154	154	308	308
Total interest on held to maturity securities	450	528	920	1,083
Federal Reserve Bank and Federal Home Loan Bank stock	134	118	268	238
Interest on federal funds sold and other short-term investments	1,727	832	2,973	1,677
Total interest income	42,108	40,208	83,160	80,234
Interest on deposits:
Interest-bearing checking	134	116	258	230
Savings	435	604	865	1,208
Money market deposit accounts	468	467	934	962
Time deposits	2,181	2,460	4,464	4,833
Interest on short-term borrowings	349	262	698	519
Total interest expense	3,567	3,909	7,219	7,752
Net interest income	38,541	36,299	75,941	72,482
Provision for loan losses	550	800	1,150	1,600
Net interest income after provision for loan losses	37,991	35,499	74,791	70,882
Noninterest income:
Trustco financial services income	1,425	1,512	3,283	3,117
Fees for services to customers	2,797	2,737	5,434	5,398
Net gain on securities transactions	0	668	0	668
Other	282	282	514	588
Total noninterest income	4,504	5,199	9,231	9,771
Noninterest expenses:
Salaries and employee benefits	9,559	8,934	19,769	17,937
Net occupancy expense	4,267	3,918	8,376	8,006
Equipment expense	1,428	1,840	2,984	3,354
Professional services	1,963	2,098	3,891	4,244
Outsourced services	1,500	1,425	3,000	2,976
Advertising expense	607	570	1,320	1,299
FDIC and other insurance	1,012	1,949	2,059	3,939
Other real estate (income) expense, net	(4)
Other real estate expense, net		423	495	942
Other	2,581	2,817	5,038	4,715
Total noninterest expenses	22,913	23,974	46,932	47,412
Income before taxes	19,582	16,724	37,090	33,241
Income taxes	7,342	6,260	13,903	12,366
Net income	$ 12,240	$ 10,464	$ 23,187	$ 20,875
Net income per share:
Basic (in dollars per share)	$ 0.127	$ 0.110	$ 0.242	$ 0.219
Diluted (in dollars per share)	$ 0.127	$ 0.109	$ 0.241	$ 0.219