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Loans - Unconditional Committed Lines of Credit and Maturity (Details) - USD ($)
$ in Thousands
Nov. 30, 2019
May 31, 2019
Unadvanced commitments    
Notional maturities of committed lines of credit    
Available Balance [1] $ 13,326,179 $ 13,237,558
2020 668,343  
2021 4,682,792  
2022 1,841,373  
2023 2,385,732  
2024 2,905,766  
Thereafter 842,173  
Unadvanced commitments not subject to material adverse change clauses    
Notional maturities of committed lines of credit    
Available Balance 3,070,365 $ 2,944,000
2020 18,073  
2021 417,498  
2022 173,335  
2023 1,082,986  
2024 897,894  
Thereafter $ 480,579  
[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.