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Loans - Available Balance Under Unadvanced Commitments and Maturity (Details) - Unadvanced commitments - USD ($)
$ in Thousands
Nov. 30, 2019
May 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
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  
Line of credit loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Available Balance 7,915,885 7,788,922 [1]
2020 437,701  
2021 4,059,897  
2022 492,117  
2023 1,362,948  
2024 1,168,481  
Thereafter 394,741  
Long-term variable-rate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Available Balance [1] 5,410,294 $ 5,448,636
2020 230,642  
2021 622,895  
2022 1,349,256  
2023 1,022,784  
2024 1,737,285  
Thereafter $ 447,432  
[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.