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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common stock amount	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Total
Increase (Decrease) in Stockholders' Equity
Modified retrospective basis adoption of Revenue Recognition Accounting Codification Standard 606			$ (184)			$ (184)
Balance at beginning of period at Dec. 31, 2017	$ 32,857	$ 186,702	144,977	$ (4,554)	$ (5,341)	354,641
Increase (Decrease) in Stockholders' Equity
Net income			32,937			32,937
Other comprehensive income				(6,268)		(6,268)
Cash dividends declared			(12,184)			(12,184)
Treasury stock purchased					(324)	(324)
Net issuance to employee stock plans, including related tax effects		(395)			1,010	615
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	32,857	187,653	166,526	(11,802)	(4,655)	370,579
Increase (Decrease) in Stockholders' Equity
Net income			22,620			22,620
Other comprehensive income				15,713		15,713
Cash dividends declared			(13,366)			(13,366)
Treasury stock purchased					(239)	(239)
Net issuance to employee stock plans, including related tax effects		(490)			217	(273)
Recognition of stock based compensation		1,373				1,373
Balance at end of period at Dec. 31, 2019	32,857	188,536	175,780	3,911	(4,677)	396,407
Increase (Decrease) in Stockholders' Equity
Net income			33,244			33,244
Other comprehensive income				7,105		7,105
Cash dividends declared			(13,417)			(13,417)
Treasury stock purchased					(14,188)	(14,188)
Net issuance to employee stock plans, including related tax effects		(22)			642	620
Recognition of stock based compensation		1,570				1,570
Balance at end of period at Dec. 31, 2020	$ 32,857	$ 190,084	$ 195,607	$ 11,016	$ (18,223)	$ 411,341

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