Summary of Significant Accounting and Reporting Policies (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Basic Earnings Per Share
Net income	$ 86,168,000	$ 72,656,000	$ 72,404,000	$ 87,529,000	$ 84,179,000	$ 76,661,000	$ 86,506,000	$ 113,451,000	$ 318,757,352		$ 360,797,232		$ 347,563,621
Less: Allocated to participating securities									4,875,057		5,591,992		4,964,928
Net Income available to common shareholders									$ 313,882,295		$ 355,205,240		$ 342,598,693
Basic weighted average shares outstanding (in shares)									230,825,293		235,526,911		242,599,923
Net Income per share - Basic (in dollars per share)	$ 0.37	$ 0.31	$ 0.31	$ 0.37	$ 0.36	$ 0.32	$ 0.36	$ 0.47	$ 1.36	[1]	$ 1.51	[1]	$ 1.41	[1]
Diluted Earnings Per Share
Allocation of Net Income used in basic computation									$ 313,882,295		$ 355,205,240		$ 342,598,693
Reallocation of undistributed earnings									5,299		17,014		14,232
Net Income available to common shareholders — Diluted									$ 313,887,594		$ 355,222,254		$ 342,612,925
Number of shares used in basic computation (in shares)									230,825,293		235,526,911		242,599,923
Additional weighted average dilutive common stock equivalents (in shares)									394,196		1,077,103		1,082,069
Diluted weighted average shares outstanding (in shares)									231,219,489		236,604,014		243,681,992
Net income per share - Diluted (in dollars per share)	$ 0.37	$ 0.31	$ 0.31	$ 0.37	$ 0.35	$ 0.32	$ 0.36	$ 0.46	$ 1.36	[1]	$ 1.50	[1]	$ 1.41	[1]

[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