Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2019	$ 237,874	$ 8,481	$ 178,159	$ 50,891	$ 343
Net income	3,818			3,818
Total other comprehensive income, net of taxes	(395)				(395)
Common stock dividends declared	(1,950)			(1,950)
Employee Stock Purchase Plan	33	1	32
Director Stock Purchase Plan	35	2	33
Restricted stock activity	96		96
Balance at Mar. 31, 2020	239,511	8,484	178,320	52,759	(52)
Balance at Dec. 31, 2019	237,874	8,481	178,159	50,891	343
Net income	10,651
Total other comprehensive income, net of taxes	(493)
Balance at Jun. 30, 2020	243,345	8,489	178,497	58,069	(150)	$ (1,560)
Balance at Mar. 31, 2020	239,511	8,484	178,320	52,759	(52)
Net income	6,833			6,833
Total other comprehensive income, net of taxes	(98)				(98)
Common stock dividends declared	(1,523)			(1,523)
Repurchased stock	(1,560)					(1,560)
Employee Stock Purchase Plan	45	3	42
Director Stock Purchase Plan	41	2	39
Restricted stock activity	96		96
Balance at Jun. 30, 2020	243,345	8,489	178,497	58,069	(150)	(1,560)
Balance at Dec. 31, 2020	255,688	8,512	178,853	70,175	(57)	(1,795)
Net income	9,312			9,312
Total other comprehensive income, net of taxes	558				558
Common stock dividends declared	(1,599)			(1,599)
Repurchased stock	(128)					(128)
Employee Stock Purchase Plan	40	2	38
Director Stock Purchase Plan	33	1	32
Restricted stock activity	132		132
Balance at Mar. 31, 2021	264,036	8,515	179,055	77,888	501	(1,923)
Balance at Dec. 31, 2020	255,688	8,512	178,853	70,175	(57)	(1,795)
Net income	18,925
Total other comprehensive income, net of taxes	276
Balance at Jun. 30, 2021	341,569	11,507	246,546	85,220	219	(1,923)
Balance at Mar. 31, 2021	264,036	8,515	179,055	77,888	501	(1,923)
Net income	9,613			9,613
Total other comprehensive income, net of taxes	(282)				(282)
Common stock dividends declared	(2,281)			(2,281)
Common shares issued through follow-on public offering (2,990,000 shares), net of underwriting discounts and offering expenses	70,238	2,990	67,248
Employee Stock Purchase Plan	38	1	37
Director Stock Purchase Plan	34	1	33
Restricted stock activity	173		173
Balance at Jun. 30, 2021	$ 341,569	$ 11,507	$ 246,546	$ 85,220	$ 219	$ (1,923)