Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Dec. 31, 2018	$ 630	$ 48,322	$ 78,434	$ (81)	$ (5,020)	$ 122,285
Beginning balance, shares at Dec. 31, 2018	6,295,113			2,470
Net Income			10,619			10,619
Other comprehensive income (loss)					6,163	6,163
Cash dividends declared			(4,531)			(4,531)
Compensation expense related to restricted stock		217				217
Acquisition of treasury stock				$ (374)		(374)
Acquisition of treasury stock, shares				11,337
Stock options exercised	$ 2	357				359
Stock options exercised, shares	19,575
Compensation expense related to stock options		156				156
Ending balance, shares at Sep. 30, 2019	6,314,688			13,807
Ending balance at Sep. 30, 2019	$ 632	49,052	84,522	$ (455)	1,143	134,894
Beginning balance at Jun. 30, 2019	$ 630	48,741	82,127	$ (455)	440	131,483
Beginning balance, shares at Jun. 30, 2019	6,304,413			13,807
Net Income			3,907			3,907
Other comprehensive income (loss)					703	703
Cash dividends declared			(1,512)			(1,512)
Compensation expense related to restricted stock		72				72
Stock options exercised	$ 2	187				189
Stock options exercised, shares	10,275
Compensation expense related to stock options		52				52
Ending balance, shares at Sep. 30, 2019	6,314,688			13,807
Ending balance at Sep. 30, 2019	$ 632	49,052	84,522	$ (455)	1,143	134,894
Beginning balance at Dec. 31, 2019	$ 634	49,471	86,536	$ (400)	1,187	137,428
Beginning balance, shares at Dec. 31, 2019	6,340,563			12,007
Net Income			9,567			9,567
Other comprehensive income (loss)					3,478	3,478
Cash dividends declared			(5,681)			(5,681)
Acquisition of UpState New York Bancorp, Inc.	$ 186	45,151				45,337
Acquisition of UpState New York Bancorp, Inc., shares	1,865,738
Compensation expense related to restricted stock		250				250
Acquisition of treasury stock				$ (69)		(69)
Acquisition of treasury stock, shares				1,771
Stock options exercised	$ 1	83				$ 84
Stock options exercised, shares	4,681					4,681
Compensation expense related to stock options		153				$ 153
Ending balance, shares at Sep. 30, 2020	8,210,982			13,778
Ending balance at Sep. 30, 2020	$ 821	95,108	90,422	$ (469)	4,665	190,547
Beginning balance at Jun. 30, 2020	$ 634	49,778	87,939	$ (469)	4,782	142,664
Beginning balance, shares at Jun. 30, 2020	6,342,568			13,778
Net Income			4,999			4,999
Other comprehensive income (loss)					(117)	(117)
Cash dividends declared			(2,516)			(2,516)
Acquisition of UpState New York Bancorp, Inc.	$ 186	45,151				45,337
Acquisition of UpState New York Bancorp, Inc., shares	1,865,738
Compensation expense related to restricted stock		83				83
Stock options exercised	$ 1	45				46
Stock options exercised, shares	2,676
Compensation expense related to stock options		51				51
Ending balance, shares at Sep. 30, 2020	8,210,982			13,778
Ending balance at Sep. 30, 2020	$ 821	$ 95,108	$ 90,422	$ (469)	$ 4,665	$ 190,547