Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic:
Net Income	$ 11,476	$ 12,737	$ 29,305	$ 30,118
Preferred Dividend	(30)	(30)	(90)	(90)
Earnings Applicable to Common Stock	$ 11,446	$ 12,707	$ 29,215	$ 30,028
Basic EPS	$ 0.65	$ 0.73	$ 1.67	$ 1.72
Weighted average number of basic shares outstanding	17,491	17,466	17,485	17,455
Diluted:
Adjusted Earnings Applicable to Common Stock	$ 11,463	$ 12,724	$ 29,265	$ 30,078
Diluted EPS	$ 0.65	$ 0.72	$ 1.66	$ 1.71
Weighted average number of diluted shares outstanding	17,606	17,581	17,600	17,570
Convertible Preferred Stock $7.00 Series [Member]
Diluted:
Preferred Dividend	$ 17	$ 17	$ 50	$ 50
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares)	115	115	115	115