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Fair Value of Financial Instruments Narrative Tagging (Details)
Mar. 31, 2017
Dec. 31, 2016
Effective rate - minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Effective rate 4.80% 4.90%
Effective rate - minimum [Member] | Public housing capital fund trusts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Effective rate   4.30%
Effective rate - maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Effective rate 12.00% 12.40%
Effective rate - maximum [Member] | Public housing capital fund trusts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Effective rate   6.00%