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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock amount	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock
Balance at beginning of period at Dec. 31, 2016	$ 156,740	$ 13,577	$ 23,027	$ 130,489	$ (4,326)	$ (6,027)
Comprehensive income:
Net income	25,993			25,993
Other comprehensive income loss	(228)				(228)
Total comprehensive income	25,765			25,993	(228)
Cash dividends declared	(11,505)			(11,505)
Acquisition of Lake Sunapee Bank Group	181,919	8,328	173,591
Treasury stock purchased	(282)					(282)
Net issuance to employee stock plans, including related tax effects	746		(222)			968
Three-for-two stock split	(16)	10,952	(10,968)
Recognition of stock based compensation	1,274		1,274
Balance at end of period at Dec. 31, 2017	354,641	32,857	186,702	144,977	(4,554)	(5,341)
Comprehensive income:
Net income	32,937			32,937
Other comprehensive income loss	(6,268)				(6,268)
Total comprehensive income	26,669			32,937	(6,268)
Cash dividends declared	(12,184)			(12,184)
Treasury stock purchased	(324)					(324)
Net issuance to employee stock plans, including related tax effects	615		(395)			1,010
Modified retrospective basis adoption of Revenue Recognition Accounting Codification Standard 606	(184)			(184)
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from accumulated other comprehensive income for adoption of ASU 2018-02				980	(980)
Recognition of stock based compensation	1,346		1,346
Balance at end of period at Dec. 31, 2018	370,579	32,857	187,653	166,526	(11,802)	(4,655)
Comprehensive income:
Net income	22,620			22,620
Other comprehensive income loss	15,713				15,713
Total comprehensive income	38,333			22,620	15,713
Cash dividends declared	(13,366)			(13,366)
Treasury stock purchased	(239)					(239)
Net issuance to employee stock plans, including related tax effects	(273)		(490)			217
Recognition of stock based compensation	1,373		1,373
Balance at end of period at Dec. 31, 2019	$ 396,407	$ 32,857	$ 188,536	$ 175,780	$ 3,911	$ (4,677)

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