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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Voting Common Stock	Series A Nonvoting Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2018	$ 3	$ 178	$ 32,288	$ 315,234	$ (4,288)	$ (3,019)	$ 340,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				18,736			18,736
Other comprehensive income					5,300		5,300
Cash dividends				(35,839)			(35,839)
Balance at Mar. 31, 2019	3	$ 178	32,288	298,131	1,012	$ (3,019)	328,593
Balance at Dec. 31, 2019	275		190,524	134,287	7,832		332,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				6,221			6,221
Other comprehensive income					4,737		4,737
Stock-based compensation			67				67
Cash dividends				(4,130)			(4,130)
Balance at Mar. 31, 2020	$ 275		$ 190,591	$ 136,378	$ 12,569		$ 339,813

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