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Loans Impaired Loans - Recorded Investment and Allowance (Details) - USD ($)
$ in Thousands
Nov. 30, 2019
May 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, Related Allowance $ 956 $ 1,021
Impaired Financing Receivable, Recorded Investment 11,097 11,853
CFC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 5,755 6,261
RTFC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Recorded Investment 5,342 5,592
Impaired Financing Receivable, Related Allowance $ 956 $ 1,021