Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Equity Balance at Dec. 31, 2018		$ 142	$ 30,121	$ 492,087	$ 9,627		$ 531,977
Net income				73,612			73,612
Stock issued under Stock Option Plan			3,389			$ 1,691	5,080
Common dividends declared	[1]			(29,373)			(29,373)
Other comprehensive gain (loss)					22,619		22,619
Purchase of the Company's common stock						(849)	(849)
Reclassification of treasury stock per Maryland law		1		841		(842)
Equity Balance at Dec. 31, 2019		143	33,510	537,167	32,246		603,066
Net income				59,313			59,313
Stock issued under Stock Option Plan			1,494			320	1,814
Common dividends declared	[2]			(33,253)			(33,253)
Other comprehensive gain (loss)					20,905		20,905
Purchase of the Company's common stock						(22,104)	(22,104)
Reclassification of treasury stock per Maryland law		(5)		(21,779)		21,784
Equity Balance at Dec. 31, 2020		138	35,004	541,448	53,151		629,741
Net income				74,627			74,627
Stock issued under Stock Option Plan			3,310			1,615	4,925
Common dividends declared	[3]			(18,851)			(18,851)
Other comprehensive gain (loss)					(20,392)		(20,392)
Purchase of the Company's common stock						(39,123)	(39,123)
Reclassification of treasury stock per Maryland law		(7)		(37,501)		$ 37,508
Equity Balance (CECL adoption) at Dec. 31, 2021				(14,175)			(14,175)
Equity Balance at Dec. 31, 2021		$ 131	$ 38,314	$ 545,548	$ 32,759		$ 616,752

[1] $2.07 per share dividend.

[2] $2.36 per share dividend.

[3] $1.40 per share dividend.