Foreclosed Assets (Details) (USD $)						3 Months Ended
	Aug. 31, 2014	May 31, 2014	Aug. 31, 2013	Aug. 31, 2014 CAH	May 31, 2014 CAH	Aug. 31, 2014 Foreclosed Assets	Aug. 31, 2014 Foreclosed Assets CAH	Aug. 31, 2014 Foreclosed Assets DRP
Activity for foreclosed assets
Beginning balance	$ 243,165,000	$ 245,651,000				$ 245,651,000	$ 239,119,000	$ 6,532,000
Results of operations						(2,699,000)	(2,621,000)	(78,000)
Net cash investments						213,000	213,000	0
Ending balance	243,165,000	245,651,000				243,165,000	236,711,000	6,454,000
Assets	22,230,468,000	22,232,743,000	22,401,497,000	293,000,000	295,000,000
Liabilities	21,276,988,000	21,262,369,000		238,000,000	236,000,000
Loans and Interest Payable				$ 182,000,000	$ 180,000,000