CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Stockholders' Equity, Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Other Comprehensive Income (Loss)	Treasury Stock
Equity Balance at Dec. 31, 2018		$ 531,977	$ 142	$ 30,121	$ 492,087	$ 9,627	$ 0
Net Income		35,988	0	0	35,988	0	0
Stock issued under Stock Option Plan		2,374	0	1,482	0	0	892
Common dividends declared	[1]	(19,691)	0	0	(19,691)	0	0
Other comprehensive gain		22,510	0	0	0	22,510	0
Reclassification of Treasury Stock per Maryland Law		0	0	0	43	0	(43)
Equity Balance at Jun. 30, 2019		572,309	142	31,603	508,427	32,137	0
Equity Balance at Mar. 31, 2019		543,635	142	30,916	494,181	18,396	0
Net Income		18,375	0	0	18,375	0	0
Stock issued under Stock Option Plan		1,102	0	687	0	0	415
Common dividends declared	[2]	(4,544)	0	0	(4,544)	0	0
Other comprehensive gain		13,741	0	0	0	13,741	0
Reclassification of Treasury Stock per Maryland Law		0	0	0	415	0	(415)
Equity Balance at Jun. 30, 2019		572,309	142	31,603	508,427	32,137	0
common stock		(849)	0	0	0	0	(849)
Equity Balance at Dec. 31, 2019		603,066	143	33,510	537,167	32,246	0
Net Income		28,071	0	0	28,071	0	0
Stock issued under Stock Option Plan		817	0	720	0	0	97
Common dividends declared	[3]	(23,843)	0	0	(23,843)	0	0
Other comprehensive gain		26,765	0	0	0	26,765	0
Reclassification of Treasury Stock per Maryland Law		0	(2)	0	(8,049)	0	8,051
Equity Balance at Jun. 30, 2020		626,728	141	34,230	533,346	59,011	0
Purchase of the Company's common stock		(8,148)	0	0	0	0	(8,148)
Equity Balance at Mar. 31, 2020		614,232	141	33,958	524,922	55,211	0
Net Income		13,203	0	0	13,203	0	0
Stock issued under Stock Option Plan		282	0	272	0	0	10
Common dividends declared	[4]	(4,789)	0	0	(4,789)	0	0
Other comprehensive gain		3,800	0	0	0	3,800	0
Reclassification of Treasury Stock per Maryland Law		0	0	0	10	0	(10)
Equity Balance at Jun. 30, 2020		$ 626,728	$ 141	$ 34,230	$ 533,346	$ 59,011	$ 0

[1] $1.39 per share

[2] $0.32 per share

[3] $1.68 per share

[4] $0.34 per share