Summary of Significant Accounting and Reporting Policies (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic Earnings Per Share
Net income		$ 360,797,232	$ 347,563,621	$ 424,683,939
Less: Allocated to participating securities		5,591,992	4,964,928	5,028,813
Net Income available to common shareholders		$ 355,205,240	$ 342,598,693	$ 419,655,126
Basic weighted average shares outstanding (in shares)		235,526,911	242,599,923	251,766,382
Net Income per share - Basic (in dollars per share)	[1]	$ 1.51	$ 1.41	$ 1.67
Diluted Earnings Per Share
Allocation of Net Income used in basic computation		$ 355,205,240	$ 342,598,693	$ 419,655,126
Reallocation of undistributed earnings		17,014	14,232	21,104
Net Income available to common shareholders — Diluted		$ 355,222,254	$ 342,612,925	$ 419,676,230
Number of shares used in basic computation (in shares)		235,526,911	242,599,923	251,766,382
Additional weighted average dilutive common stock equivalents (in shares)		1,077,103	1,082,069	1,506,608
Diluted weighted average shares outstanding (in shares)		236,604,014	243,681,992	253,272,990
Net income per share - Diluted (in dollars per share)	[1]	$ 1.50	$ 1.41	$ 1.66

[1] (1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards