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Acquisition of UpState New York Bancorp, Inc. and USNY Bank (Proforma) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Net interest income	$ 15,330		$ 9,891	$ 34,862	$ 28,773
Non-interest Income	2,072		1,882	5,119	5,083
Net Income	$ 4,999		$ 3,907	$ 9,567	$ 10,619
Earnings Per Share, Basic	$ 0.62		$ 0.62	$ 1.39	$ 1.70
Earnings Per Share, Diluted	$ 0.62		$ 0.62	$ 1.39	$ 1.68
UpState New York Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Net interest income	$ 13,480	$ 3,522	$ 13,236	$ 38,632	$ 38,658
Non-interest Income	2,072	$ 151	2,089	5,443	5,704
Net Income	$ 5,304		$ 5,287	$ 14,434	$ 14,759
Earnings Per Share, Basic	$ 0.66		$ 0.66	$ 1.80	$ 1.84
Earnings Per Share, Diluted	$ 0.66		$ 0.66	$ 1.79	$ 1.83

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