Common Stock	12 Months Ended
	Dec. 31, 2020
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	Common Stock    Quarterly cash dividends were paid aggregating to $8.8 million, $8.5 million, and $7.1 million, or $1.38 per share, $1.26 per share, and $1.02 per share, in 2020, 2019, and 2018, respectively.  On February 25, 2021, the Board of Directors declared a $0.37 per share cash dividend payable on March 19, 2021, to shareholders of record on March 11, 2021.  Federal and State regulations place certain limitations on the payment of dividends by the Company.    In January 2020, the Company’s Board of Directors approved a plan whereby it would periodically repurchase for cash up to approximately 5% of its shares of common stock in the open market. At December, 31, 2020, there were no shares available under the stock repurchase program. However, on February 1, 2021 the Company announced that its Board of Directors authorized the repurchase of up to an additional 313,000 shares of common stock. The Company intends to continue to repurchase its stock from time to time depending upon market conditions. The Company can make no assurances that it will continue this program or that it will authorize additional shares for repurchase.  During 2020, 2019 and 2018, 327,000, 347,676 and 15,468 shares were repurchased, respectively.