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Loans Unadvanced Commitments - Available Balance and Maturity (Details) - Unadvanced commitments - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Available Balance [1] $ 12,645,618 $ 12,574,974
2019 5,052,591  
2020 1,296,768  
2021 1,458,007  
2022 2,485,309  
2023 2,315,976  
Thereafter 36,967  
Lines of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Available Balance [1] 7,692,784 7,772,655
2019 4,168,751  
2020 710,763  
2021 805,508  
2022 770,971  
2023 1,211,791  
Thereafter 25,000  
Long-term loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Available Balance [1] 4,952,834 $ 4,802,319
2019 883,840  
2020 586,005  
2021 652,499  
2022 1,714,338  
2023 1,104,185  
Thereafter $ 11,967  
[1] The interest rate on unadvanced loan commitments is not set until an advance is made; therefore, all long-term unadvanced loan commitments are reported as variable-rate. However, the borrower may select either a fixed or a variable rate when an advance on a commitment is made.