Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at beginning of period 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 cash dividends declared	[1]			(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
Balance at ending of period 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 cash dividends declared	[2]			(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
Balance at ending of period (CECL adoption) at Dec. 31, 2021				(14,175)			(14,175)
Balance at ending of period at Dec. 31, 2021		131	38,314	545,548	32,759		616,752
Net income				75,948			75,948
Stock issued under Stock Option Plan			4,131			3,564	7,695
Common cash dividends declared	[3]			(19,347)			(19,347)
Other comprehensive gain (loss)					(86,114)		(86,114)
Purchase of the Company's common stock						(61,847)	(61,847)
Reclassification of treasury stock per Maryland law		(9)		(58,274)		$ 58,283
Balance at ending of period at Dec. 31, 2022		$ 122	$ 42,445	$ 543,875	$ (53,355)		$ 533,087

[1] $2.36 per share total dividends.

[2] $1.40 per share total dividends.

[3] $1.56 per share total dividends.