Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Shares [Member]	Retained Earnings [Member]	Treasury Shares [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2019	$ 330,126	$ 276,422	$ 67,974	$ (21,144)	$ 6,874
Balance, shares at Dec. 31, 2019		16,687,542
Net Income	14,337		14,337
Other comprehensive income (Loss)	6,780				6,780
Stock-based compensation	419	$ 419
Stock-based compensation, shares		41,245
Common stock dividends ($0.12, $0.11, $0.24 and $0.22 per share for three and six months ended June 30, 2021 and 2020)	(3,599)		(3,599)
Purchase of common stock	(11,450)			(11,450)
Purchase of common stock, shares		(675,808)
Ending balance at Jun. 30, 2020	336,613	$ 276,841	78,712	(32,594)	13,654
Balance, shares at Jun. 30, 2020		16,052,979
Beginning balance at Mar. 31, 2020	328,167	$ 276,546	73,972	(32,239)	9,888
Balance, shares at Mar. 31, 2020		16,064,010
Net Income	6,504		6,504
Other comprehensive income (Loss)	3,766				3,766
Stock-based compensation	295	$ 295
Stock-based compensation, shares		14,266
Common stock dividends ($0.12, $0.11, $0.24 and $0.22 per share for three and six months ended June 30, 2021 and 2020)	(1,764)		(1,764)
Purchase of common stock	(355)			(355)
Purchase of common stock, shares		(25,297)
Ending balance at Jun. 30, 2020	336,613	$ 276,841	78,712	(32,594)	13,654
Balance, shares at Jun. 30, 2020		16,052,979
Beginning balance at Dec. 31, 2020	350,108	$ 277,039	93,048	(34,598)	14,619
Balance, shares at Dec. 31, 2020		15,898,032
Net Income	19,922		19,922
Other comprehensive income (Loss)	(2,926)				(2,926)
Stock-based compensation	456	$ 456
Stock-based compensation, shares		46,864
Common stock dividends ($0.12, $0.11, $0.24 and $0.22 per share for three and six months ended June 30, 2021 and 2020)	(3,792)		(3,792)
Purchase of common stock	(11,355)			(11,355)
Purchase of common stock, shares		(510,304)
Ending balance at Jun. 30, 2021	352,413	$ 277,495	109,178	(45,953)	11,693
Balance, shares at Jun. 30, 2021		15,434,592
Beginning balance at Mar. 31, 2021	350,058	$ 277,164	101,899	(38,574)	9,569
Balance, shares at Mar. 31, 2021		15,750,479
Net Income	9,164		9,164
Other comprehensive income (Loss)	2,124				2,124
Stock-based compensation	331	$ 331
Stock-based compensation, shares		7,725
Common stock dividends ($0.12, $0.11, $0.24 and $0.22 per share for three and six months ended June 30, 2021 and 2020)	(1,885)		(1,885)
Purchase of common stock	(7,379)			(7,379)
Purchase of common stock, shares		(323,612)
Ending balance at Jun. 30, 2021	$ 352,413	$ 277,495	$ 109,178	$ (45,953)	$ 11,693
Balance, shares at Jun. 30, 2021		15,434,592