CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Stockholders' Equity, Total	Total
Equity Balance at Dec. 31, 2020	$ 138	$ 35,004	$ 541,448	$ 53,151		$ 629,741
Net income			38,982			38,982
Stock issued under Stock Option Plan		1,876			$ 817	2,693
Common dividends declared			(9,312)			(9,312)
Other comprehensive loss				(10,912)		(10,912)
Purchase of the Company's common stock					(7,460)	(7,460)
Reclassification of treasury stock per Maryland law	(1)		(6,642)		6,643
Equity Balance (CECL adoption) at Jun. 30, 2021			(14,175)			(14,175)
Equity Balance at Jun. 30, 2021	137	36,880	550,301	42,239		629,557
Equity Balance at Mar. 31, 2021	137	35,661	537,969	37,690		611,457
Net income			20,114			20,114
Stock issued under Stock Option Plan		1,219			554	1,773
Common dividends declared			(4,656)			(4,656)
Other comprehensive gain				4,549		4,549
Purchase of the Company's common stock					(3,680)	(3,680)
Reclassification of treasury stock per Maryland law			(3,126)		3,126
Equity Balance (CECL adoption) at Jun. 30, 2021			(14,175)			(14,175)
Equity Balance at Jun. 30, 2021	137	36,880	550,301	42,239		629,557
Equity Balance at Dec. 31, 2021	131	38,314	545,548	32,759		616,752
Net income			35,211			35,211
Stock issued under Stock Option Plan		2,251			1,418	3,669
Common dividends declared			(9,549)			(9,549)
Change in fair value of cash flow hedges				(8,783)		(8,783)	$ (5,672)
Change in unrealized gain (loss) on held-to-maturity securities				249		249
Change in unrealized loss on available-for-sale securities				(37,524)		(37,524)
Purchase of the Company's common stock					(50,381)	(50,381)
Reclassification of treasury stock per Maryland law	(8)		(48,955)		48,963
Equity Balance at Jun. 30, 2022	123	40,565	522,255	(13,299)		549,644
Equity Balance at Mar. 31, 2022	128	40,004	533,736	8,683		582,551
Net income			18,224			18,224
Stock issued under Stock Option Plan		561			303	864
Common dividends declared			(4,951)			(4,951)
Change in fair value of cash flow hedges				(4,153)		(4,153)	$ (2,589)
Change in unrealized gain (loss) on held-to-maturity securities				(509)		(509)
Change in unrealized loss on available-for-sale securities				(17,320)		(17,320)
Purchase of the Company's common stock					(25,062)	(25,062)
Reclassification of treasury stock per Maryland law	(5)		(24,754)		$ 24,759
Equity Balance at Jun. 30, 2022	$ 123	$ 40,565	$ 522,255	$ (13,299)		$ 549,644