Subordinated Deferrable Debt (Tables)

12 Months Ended

May 31, 2018

Subordinated Debt [Abstract]

Schedule of Subordinated Borrowing

The following table presents subordinated deferrable debt outstanding and the weighted-average interest rates as of May 31, 2018 and 2017.

	May 31,
	2018					2017
(Dollars in thousands)	Amount			Weighted- Average Interest Rate		Amount			Weighted-Average Interest Rate
4.75% due 2043 with a call date of April 30, 2023	$	400,000		4.75	%	$	400,000		4.75	%
5.25% due 2046 with a call date of April 20, 2026	350,000			5.25		350,000			5.25
Debt issuance costs	(7,590		)			(7,726		)
Total subordinated deferrable debt	$	742,410		4.98		$	742,274		4.98