Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest and dividend income:
Interest and fees on loans	$ 37,513	$ 36,171	$ 110,219	$ 107,428
Interest and dividends on securities available for sale:
U. S. government sponsored enterprises	465	408	1,667	1,067
State and political subdivisions	6	13	29	40
Mortgage-backed securities and collateralized mortgage obligations-residential	1,815	1,829	5,717	6,114
Corporate bonds	153	97	458	97
Small Business Administration-guaranteed participation securities	380	445	1,189	1,371
Mortgage-backed securities and collateralized mortgage obligations-commercial	22	36	66	110
Other securities	4	4	12	12
Total interest and dividends on securities available for sale	2,845	2,832	9,138	8,811
Interest on held to maturity securities:
Mortgage-backed securities and collateralized mortgage obligations-residential	276	347	888	1,123
Corporate bonds	102	156	410	464
Total interest on held to maturity securities	378	503	1,298	1,587
Federal Reserve Bank and Federal Home Loan Bank stock	125	131	393	369
Interest on federal funds sold and other short-term investments	1,927	866	4,900	2,542
Total interest income	42,788	40,503	125,948	120,737
Interest on deposits:
Interest-bearing checking	113	120	371	350
Savings	435	504	1,300	1,712
Money market deposit accounts	469	463	1,403	1,426
Time deposits	2,247	2,468	6,711	7,301
Interest on short-term borrowings	345	281	1,043	800
Total interest expense	3,609	3,836	10,828	11,589
Net interest income	39,179	36,667	115,120	109,148
Provision for loan losses	550	750	1,700	2,350
Net interest income after provision for loan losses	38,629	35,917	113,420	106,798
Noninterest income:
Trustco financial services income	1,844	1,347	5,127	4,464
Fees for services to customers	2,767	2,664	8,201	8,062
Net gain on securities transactions	0	0	0	668
Other	243	718	757	1,306
Total noninterest income	4,854	4,729	14,085	14,500
Noninterest expenses:
Salaries and employee benefits	10,360	8,995	30,129	26,932
Net occupancy expense	4,027	3,887	12,403	11,893
Equipment expense	1,669	1,596	4,653	4,950
Professional services	1,679	1,959	5,570	6,203
Outsourced services	1,650	1,465	4,650	4,441
Advertising expense	699	489	2,019	1,788
FDIC and other insurance	1,018	1,127	3,077	5,066
Other real estate expense (income), net	275	895	770	1,837
Other	2,149	2,636	7,187	7,352
Total noninterest expenses	23,526	23,049	70,458	70,462
Income before taxes	19,957	17,597	57,047	50,836
Income taxes	7,361	6,667	21,264	19,033
Net income	$ 12,596	$ 10,930	$ 35,783	$ 31,803
Net income per share:
Basic (in dollars per share)	$ 0.131	$ 0.114	$ 0.373	$ 0.333
Diluted (in dollars per share)	$ 0.131	$ 0.114	$ 0.372	$ 0.333