Allowance for Credit Losses and Credit Quality Information (Rollforward of Allowance For Loan Losses) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				$ 125,552,733				$ 134,242,862	$ 125,552,733	$ 134,242,862	$ 91,722,288
Provision for credit losses	$ 29,276,000	$ 40,632,000	$ 40,463,000	$ 46,602,000	$ 45,412,000	$ 59,609,000	$ 68,620,000	$ 85,822,000	156,973,220	259,463,199	186,207,341
Charge-offs									(210,544,759)	(302,380,145)	(164,747,552)
Recoveries									30,981,617	34,226,817	21,060,785
Net charge-off									(179,563,142)	(268,153,328)	(143,686,767)
Ending balance	$ 102,962,811				$ 125,552,733				102,962,811	125,552,733	$ 134,242,862
Charge offs									19,300,000	15,800,000
Proceeds from prior write offs, prior periods									5,700,000	8,400,000
Proceeds from prior write offs, current period									$ 13,600,000	$ 7,400,000