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Loans and Commitments (Details 1) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Notional maturities of committed lines of credit    
Total unadvanced commitments   $ 39,000
Unadvanced commitments subject to material adverse change clauses
   
Notional maturities of committed lines of credit    
2014 19,048  
2015 55,026  
2016 61,000  
2017 466,061  
2018 861,098  
Thereafter 786,529  
Total unadvanced commitments $ 2,248,762 $ 11,720,000