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Debt Financing Narrative Tagging (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2014
USD ($)
Sep. 30, 2015
USD ($)
Integer
Sep. 30, 2015
USD ($)
Integer
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2010
USD ($)
Debt financing   $ 447,606,493 $ 447,606,493   $ 345,359,000    
Available for Sale Securities, not Including Premiums         59,308,398    
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities     22,323,371 $ 6,665,718      
Public housing capital fund trusts, at fair value   59,876,842 59,876,842   61,263,123    
Mortgage revenue bonds held in trust, at fair value   499,197,562 499,197,562   378,423,092    
Proceeds from Sale of Available-for-sale Securities     0 35,483,230      
Available for Sale Securities at Par Value, held in trust   118,010,775 118,010,775   118,342,000    
Payments to Acquire Available-for-sale Securities     137,805,000 107,770,827      
Increase (Decrease) in Restricted Cash     $ 106,709 475,208      
Bankers Trust 2 [Member]              
Debt Instrument, Maturity Date     May 14, 2017        
Line of Credit Facility, Maximum Borrowing Capacity   50,000,000 $ 50,000,000        
Five Points Bank [Member]              
Debt Instrument, Maturity Date     Mar. 01, 2016        
Line of Credit Facility, Maximum Borrowing Capacity   5,000,000 $ 5,000,000        
Line of Credit Facility, Interest Rate During Period     3.50%        
Bankers Trust [Member]              
Debt Instrument, Maturity Date     Mar. 01, 2016        
Line of Credit Facility, Maximum Borrowing Capacity   $ 5,000,000 $ 5,000,000        
Line of Credit Facility, Interest Rate During Period     3.40%        
TOB facility-2 [Member]              
Debt, Weighted Average Interest Rate   2.30% 2.30%        
TOB Facility-1 [Member]              
Debt, Weighted Average Interest Rate   1.10% 1.10%        
TEBS II Facility [Member]              
Debt financing   $ 94,500,000 $ 94,500,000   94,700,000    
Short-term Debt, Percentage Bearing Fixed Interest Rate   1.40% 1.40%        
Debt Instrument, Basis Spread on Variable Rate   0.00%          
Debt Instrument, Total Rate of Borrowing   1.40% 1.40%        
Number of Available for Sale Securities, Held in a Trust | Integer   13 13        
Mortgage revenue bonds held in trust, at fair value   $ 118,372,000 $ 118,372,000        
Debt Financing, Net   91,600,000          
Payments to Acquire Available-for-sale Securities   72,400,000          
Restricted Cash and Cash Equivalents   1,300,000 1,300,000   6,300,000    
Derivative Asset, Notional Amount $ 31,600,000            
Derivative, Fixed Interest Rate 3.00%            
Derivative, Maturity Date at a point in time Aug. 15, 2019            
TEB Facility [Member]              
Debt financing   $ 76,000,000 $ 76,000,000        
Debt Instrument, Basis Spread on Variable Rate     1.90%        
Debt Instrument, Interest Rate, Stated Percentage   0.10% 0.10%        
Debt, Weighted Average Interest Rate   2.00% 2.00%        
Number of Available for Sale Securities, Held in a Trust | Integer   13 13        
Available for Sale Securities at Par Value, held in trust   $ 102,866,709 $ 102,866,709   103,516,998    
Trading Securities [Member]              
Debt financing   193,155,000 193,155,000   174,250,000    
Trading Securities [Member] | TOB facility-15, 16, and 17 [Member]              
Debt financing   41,800,000 41,800,000     $ 33,300,000  
Trading Securities [Member] | TOB facility-15 [Member]              
Debt financing   $ 14,940,000 $ 14,940,000        
Debt, Weighted Average Interest Rate   2.80% 2.80%        
Available-for-sale Security, Maturity Date at a point in time     Feb. 19, 2018        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   2.76% 2.76%        
Trading Securities [Member] | TOB facility-9 [Member]              
Debt financing         $ 25,535,000    
Available-for-sale Security, Maturity Date at a point in time     Nov. 01, 2015   Jun. 01, 2015    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.05% 4.05%        
Trading Securities [Member] | TOB Facility-10 [Member]              
Debt financing   $ 22,850,000 $ 22,850,000   $ 21,850,000    
Available-for-sale Security, Maturity Date at a point in time     Oct. 01, 2016   Oct. 01, 2016    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.26% 4.26%   4.34%    
Trading Securities [Member] | TOB facility-2 [Member]              
Debt financing   $ 43,985,000 $ 43,985,000   $ 44,675,000    
Available-for-sale Security, Maturity Date at a point in time     Dec. 01, 2015   Jun. 01, 2015    
Trading Securities [Member] | TOB Facility-12 [Member] [Member]              
Debt financing   $ 17,250,000 $ 17,250,000   $ 17,250,000    
Available-for-sale Security, Maturity Date at a point in time     Jul. 01, 2017   Jul. 01, 2017    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.51% 4.51%   4.55%    
Trading Securities [Member] | TOB Facility-11 [Member]              
Debt financing   $ 37,955,000 $ 37,955,000   $ 34,975,000    
Available-for-sale Security, Maturity Date at a point in time     Jul. 01, 2019   Jul. 01, 2019    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.39% 4.39%   4.47%    
Trust Portfolio--MBS Bonds [Member]              
Available for Sale Securities, not Including Premiums   $ 14,765,000 $ 14,765,000        
Number of Available for Sale Securities, Mortgage Backed Securities | Integer   3 3        
Cash Collateral for Borrowed Securities   $ 1,600,000 $ 1,600,000        
Public housing capital fund trusts [Member]              
Available for Sale Securities, not Including Premiums   $ 58,344,872 $ 58,344,872        
Debt, Weighted Average Interest Rate   5.20% 5.20%        
Public housing capital fund trusts, at fair value   $ 59,876,842 $ 59,876,842   $ 61,263,123    
Woodland Park [Member]              
Debt Instrument, Basis Spread on Variable Rate     0.20%        
Debt Instrument, Interest Rate, Stated Percentage   2.80% 2.80%        
Avistar at Chase Hill [Member] | TEBS II Facility [Member]              
Increase (Decrease) in Restricted Cash     $ 1,900,000        
Arbors at Hickory Ridge [Member]              
Mortgage revenue bonds held in trust, at fair value [1]   $ 13,103,981 13,103,981   13,363,236    
Lost Creek [Member]              
Proceeds from Sale of Available-for-sale Securities       $ 18,700,000      
TOB Facility [Member]              
Debt financing   137,200,000 137,200,000     $ 124,700,000  
LIFERS [Member] | Trust Portfolio--MBS Bonds [Member]              
Available for Sale Securities, not Including Premiums   2,800,000 2,800,000        
SPEARS [Member] | Trust Portfolio--MBS Bonds [Member]              
TOB Financing   11,900,000 11,900,000        
Mortgage Backed Security Trust 5 [Member] [Member] | Trading Securities [Member] | TOB facility-3 [Member]              
Debt financing   5,270,000 $ 5,270,000   $ 5,270,000    
Available-for-sale Security, Maturity Date at a point in time     Oct. 01, 2015   Apr. 01, 2015    
Class A TEBS Certificates [Member] | TEB Facility [Member]              
Debt financing             $ 95,800,000
Class B TEBS Certificates [Member] | TEB Facility [Member]              
Debt financing             $ 20,300,000
Series B [Member] | TEBS II Facility [Member]              
Mortgage revenue bonds held in trust, at fair value   $ 23,700,000 $ 23,700,000        
Effective rate - minimum [Member]              
Effective rate   3.40% 3.40%   4.70%    
Effective rate - minimum [Member] | Trust Portfolio--MBS Bonds [Member]              
Effective rate   3.80% 3.80%   3.70%    
Effective rate - minimum [Member] | Public housing capital fund trusts [Member]              
Effective rate   4.10% 4.10%   4.20%    
Effective rate - minimum [Member] | TOB Facility [Member]              
Effective rate   2.80% 2.80%        
Effective rate - maximum [Member]              
Effective rate   9.50% 9.50%   8.30%    
Effective rate - maximum [Member] | Trust Portfolio--MBS Bonds [Member]              
Effective rate   5.30% 5.30%   5.20%    
Effective rate - maximum [Member] | Public housing capital fund trusts [Member]              
Effective rate   5.80% 5.80%   5.40%    
Effective rate - maximum [Member] | TOB Facility [Member]              
Effective rate   4.50% 4.50%        
[1] Mortgage revenue bonds owned by ATAX TEBS II, LLC, see Note 11(4) Mortgage revenue bonds owned by ATAX TEBS III, LLC, see Note 11