CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Total
Beginning Balance at Dec. 31, 2019	$ 18,997	$ 409,805	$ 110,460	$ 10,089	$ (5,693)	$ 543,658
Beginning Balance (in shares) at Dec. 31, 2019	18,996,948				(194,682)
Net income			8,311			8,311
Other comprehensive income/loss				5,742		5,742
Dividends on common stock			(1,885)			(1,885)
Issuance of restricted stock grants	$ 61	(61)
Issuance of restricted stock grants (in shares)	60,680
Compensation expense		478				478
Repurchase of restricted stock for payment of taxes	$ (11)	(367)				(378)
Repurchase of restricted stock for payment of taxes (in shares)	(10,991)
Ending Balance at Mar. 31, 2020	$ 19,047	409,855	116,886	15,831	$ (5,693)	555,926
Ending Balance (in shares) at Mar. 31, 2020	19,046,637				(194,682)
Beginning Balance at Dec. 31, 2019	$ 18,997	409,805	110,460	10,089	$ (5,693)	543,658
Beginning Balance (in shares) at Dec. 31, 2019	18,996,948				(194,682)
Net income						25,254
Ending Balance at Jun. 30, 2020	$ 21,590	455,650	131,698	24,550	$ (5,693)	627,795
Ending Balance (in shares) at Jun. 30, 2020	21,589,940				(194,682)
Beginning Balance at Mar. 31, 2020	$ 19,047	409,855	116,886	15,831	$ (5,693)	555,926
Beginning Balance (in shares) at Mar. 31, 2020	19,046,637				(194,682)
Net income			16,943			16,943
Other comprehensive income/loss				8,719		8,719
Dividends on common stock			(2,131)			(2,131)
Issuance of common shares for SWG acquisition	$ 2,547	45,311				47,858
Issuance of common shares for SWG acquisition (in shares)	2,546,967
Issuance of restricted stock grants	$ 4	(4)
Issuance of restricted stock grants (in shares)	3,750
Restricted stock grants forfeited	$ (5)	5
Restricted stock grants forfeited (in shares)	(4,762)
Compensation expense		539				539
Repurchase of restricted stock for payment of taxes	$ (3)	(56)				(59)
Repurchase of restricted stock for payment of taxes (in shares)	(2,652)
Ending Balance at Jun. 30, 2020	$ 21,590	455,650	131,698	24,550	$ (5,693)	627,795
Ending Balance (in shares) at Jun. 30, 2020	21,589,940				(194,682)
Beginning Balance at Dec. 31, 2020	$ 21,599	456,919	154,241	25,816	$ (13,760)	644,815
Beginning Balance (in shares) at Dec. 31, 2020	21,598,993				(483,984)
Net income			16,644			16,644
Common stock repurchased					$ (5,171)	(5,171)
Common stock repurchased (in shares)					(165,623)
Other comprehensive income/loss				(9,615)		(9,615)
Dividends on common stock			(2,723)			(2,723)
Issuance of restricted stock grants	$ 85	(85)
Issuance of restricted stock grants (in shares)	84,578
Restricted stock grants forfeited	$ (1)	1
Restricted stock grants forfeited (in shares)	(500)
Compensation expense		440				440
Repurchase of restricted stock for payment of taxes	$ (15)	(426)				(441)
Repurchase of restricted stock for payment of taxes (in shares)	(14,720)
Ending Balance at Mar. 31, 2021	$ 21,668	456,849	168,162	16,201	$ (18,931)	643,949
Ending Balance (in shares) at Mar. 31, 2021	21,668,351				(649,607)
Beginning Balance at Dec. 31, 2020	$ 21,599	456,919	154,241	25,816	$ (13,760)	644,815
Beginning Balance (in shares) at Dec. 31, 2020	21,598,993				(483,984)
Net income						32,244
Ending Balance at Jun. 30, 2021	$ 21,670	457,396	180,820	19,097	$ (18,931)	660,052
Ending Balance (in shares) at Jun. 30, 2021	21,670,330				(649,607)
Beginning Balance at Mar. 31, 2021	$ 21,668	456,849	168,162	16,201	$ (18,931)	643,949
Beginning Balance (in shares) at Mar. 31, 2021	21,668,351				(649,607)
Net income			15,600			15,600
Other comprehensive income/loss				2,896		2,896
Dividends on common stock			(2,942)			(2,942)
Issuance of restricted stock grants	$ 3	(3)
Issuance of restricted stock grants (in shares)	3,000
Restricted stock grants forfeited	$ (1)	1
Restricted stock grants forfeited (in shares)	(1,021)
Compensation expense		549				549
Ending Balance at Jun. 30, 2021	$ 21,670	$ 457,396	$ 180,820	$ 19,097	$ (18,931)	$ 660,052
Ending Balance (in shares) at Jun. 30, 2021	21,670,330				(649,607)