Interest Income and Interest Expense - Schedule of Interest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Interest income:
Investment securities	$ 4,298	$ 4,449
Interest income	306,978	283,268
Interest expense:
Short-term borrowings	24,209	3,393
Total interest expense	209,468	174,777
Net interest income	97,510	108,491
Loans receivable
Interest income:
Loans	302,680	278,819
Long-term debt
Interest expense:
Long-term debt and subordinated debt	158,881	144,873
Subordinated debt
Interest expense:
Long-term debt and subordinated debt	$ 26,378	$ 26,511