Dividends and Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Dividends [Abstract]
Cash dividends declared per share of common stock (in dollars per share)	$ 0	$ 0
Basic Earnings per Common Share [Abstract]
Common stock equivalent shares (in shares)	0
Net Income	$ 16,713	$ 14,122
Weighted Average Number of Common Shares Outstanding (in shares)	789,646	793,504
Basic Earnings Per Common Share (in dollars per share)	$ 21.17	$ 17.80
Diluted Earnings Per Common Share (in dollars per share)	$ 21.17	$ 17.80