Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Parenthetical Disclosure [Abstract]
Debt Securities, Held-to-maturity, Fair Value		$ 50,598
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, par value	$ 25	$ 25
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	19,047,548	19,047,548
Common stock, treasury shares	3,280,040	2,744,109