CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock $1 Par	Surplus	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Balance at Dec. 31, 2017	$ 143,983	$ 9,687	$ 109,788	$ 26,064	$ (1,556)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of stranded tax effects in accumulated other comprehensive income	0			306	(306)
Net income	14,213			14,213
Other comprehensive income (loss)	(5,276)				(5,276)
Cash dividends on common stock	(5,636)			(5,636)
Balance at Dec. 31, 2018	147,284	9,687	109,788	34,947	(7,138)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,241			14,241
Common stock issued in private placement, 54,130 shares	1,000	54	1,048	(102)
Other comprehensive income (loss)	9,313				9,313
Cash dividends on common stock	(5,803)			(5,803)
Balance at Dec. 31, 2019	166,035	9,741	110,836	43,283	2,175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,318			20,318
Other comprehensive income (loss)	(1,528)				(1,528)
Cash dividends on common stock	(6,234)			(6,234)
Balance at Dec. 31, 2020	$ 178,591	$ 9,741	$ 110,836	$ 57,367	$ 647