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Debt Financing Footnote XBRL details (Details)
1 Months Ended 12 Months Ended
Feb. 28, 2015
USD ($)
Integer
Dec. 31, 2015
USD ($)
Integer
Nov. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Aug. 31, 2014
USD ($)
Jul. 31, 2014
USD ($)
Integer
collateralized_bonds
Apr. 30, 2014
USD ($)
Feb. 28, 2014
USD ($)
Dec. 31, 2015
USD ($)
Integer
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jul. 31, 2015
USD ($)
Integer
Jun. 30, 2015
USD ($)
Jul. 10, 2014
USD ($)
Integer
Jun. 30, 2014
USD ($)
May 31, 2014
USD ($)
Jul. 31, 2012
USD ($)
Debt financing   $ 451,496,716               $ 451,496,716 $ 341,619,463              
Debt financing   456,431,288               456,431,288                
TOB Financing   23,400,000           $ 873,000   23,400,000                
Available-for-sale Securities, Fair Value Disclosure Held in Trust   536,316,481               536,316,481 378,423,092              
Payments to Acquire Available-for-sale Securities                   188,572,000 142,794,827 $ 148,624,000            
M24 Financing Facility Derivatives [Member]                                    
Cash Collateral for Borrowed Securities   400,000               400,000                
Restricted Cash and Cash Equivalents   400,000               400,000                
Autumn Pines [Member]                                    
Proceeds from Sale of Available-for-sale Securities               13,100,000                    
Lost Creek [Member]                                    
Proceeds from Sale of Available-for-sale Securities                 $ 18,700,000   18,700,000              
Available-for-sale Securities, Fair Value Disclosure Held in Trust                     18,500,000              
Fairmont Oaks And Bent Tree Properties [Member]                                    
Proceeds from Sale of Available-for-sale Securities   14,100,000 $ 14,100,000                              
Trading Securities [Member]                                    
TOB Financing   $ 216,512,124               $ 216,512,124 $ 174,185,857              
Debt Instrument, Total Rate of Borrowing   3.26%               3.26% 3.23%              
TOB Facility [Member]                                    
Number of Available for Sale Securities, Held in a Trust | Integer             4                      
Number of Collateralized Bonds | collateralized_bonds             10                      
Debt Instrument, Total Rate of Borrowing   3.70%               3.70% 3.90%              
Trust Portfolio--MBS Bonds [Member]                                    
Available for Sale Securities, not Including Premiums   $ 14,765,000               $ 14,765,000 $ 14,765,000         $ 3,700,000 $ 3,700,000  
Cash Collateral for Borrowed Securities   $ 1,500,000               $ 1,500,000 $ 2,100,000              
Debt, Weighted Average Interest Rate   1.10%               1.10% 1.10%              
Trust Portfolio--MBS Bonds [Member] | Mortgage Backed Security Trust 4 [Member]                                    
TOB Financing   $ 6,000,000     $ 6,000,000         $ 6,000,000                
Trust Portfolio--MBS Bonds [Member] | Mortgage Backed Security Trust 5 [Member] [Member]                                    
TOB Financing   5,300,000     5,300,000         5,300,000                
Trust Portfolio--MBS Bonds [Member] | Mortgage Backed Security Trust 6 [Member]                                    
TOB Financing   7,800,000     7,800,000         7,800,000                
Trust Portfolio--MBS Bonds [Member] | Mortgage Backed Security Trusts 4, 5, 6 [Member]                                    
TOB Financing   19,100,000     19,100,000         19,100,000                
Public housing capital fund trusts [Member]                                    
Available for Sale Securities, not Including Premiums   $ 58,344,872               $ 58,344,872 $ 59,308,398             $ 65,300,000
Cash Collateral for Borrowed Securities                     $ 400,000              
Debt Instrument, Total Rate of Borrowing   2.30%               2.30% 2.20%              
Debt, Weighted Average Interest Rate   5.20%               5.20%                
Effective rate - minimum [Member]                                    
Effective rate   4.20%               4.20%                
Effective rate - minimum [Member] | Trust Portfolio--MBS Bonds [Member]                                    
Effective rate   3.70%               3.70%                
Effective rate - minimum [Member] | Public housing capital fund trusts [Member]                                    
Effective rate   3.90%               3.90%                
Effective rate - maximum [Member]                                    
Effective rate   12.10%               12.10%                
Effective rate - maximum [Member] | Trust Portfolio--MBS Bonds [Member]                                    
Effective rate   5.30%               5.30%                
Effective rate - maximum [Member] | Public housing capital fund trusts [Member]                                    
Effective rate   5.70%               5.70%                
TOB Facility-10 [Member]                                    
Available-for-sale Security, Maturity Date at a point in time                   Oct. 01, 2016                
TOB Facility-10 [Member] | Trading Securities [Member]                                    
Available-for-sale Security, Maturity Date at a point in time             Jul. 01, 2015     Oct. 01, 2016 Oct. 01, 2016              
TOB Financing   $ 22,847,450         $ 21,900,000     $ 22,847,450 $ 21,841,852              
Debt Instrument, Total Rate of Borrowing   4.26%               4.26% 4.34%              
TOB Facility-11 [Member]                                    
Available-for-sale Security, Maturity Date at a point in time                   Jul. 01, 2019                
TOB Facility-11 [Member] | Trading Securities [Member]                                    
Available-for-sale Security, Maturity Date at a point in time             Jul. 01, 2015     Jul. 01, 2019 Jul. 01, 2019              
TOB Financing   $ 37,935,981         $ 35,000,000     $ 37,935,981 $ 34,942,917              
Debt Instrument, Total Rate of Borrowing   4.39%               4.39% 4.47%              
TOB facility-18 and 19 [Member]                                    
Debt financing   $ 23,400,000               $ 23,400,000                
Number of Available for Sale Securities, Held in a Trust | Integer   2               2                
TOB facility-9 [Member] | Trading Securities [Member]                                    
Available-for-sale Security, Maturity Date at a point in time       Jul. 01, 2015             Jun. 01, 2015              
TOB Financing       $ 15,000,000             $ 25,535,000              
Debt Instrument, Total Rate of Borrowing                     1.96%              
TOB facility-15, 16, and 17 [Member]                                    
Number of Available for Sale Securities, Held in a Trust | Integer 3                                  
TOB facility-15, 16, and 17 [Member] | Trading Securities [Member]                                    
Debt financing $ 33,300,000                                  
Available-for-sale Security, Maturity Date at a point in time Jul. 01, 2015                                  
TOB facility-13 [Member] | Trading Securities [Member]                                    
Debt financing         $ 9,000,000                          
Available-for-sale Security, Maturity Date at a point in time         Jul. 01, 2015         Jul. 01, 2017 Jul. 01, 2017              
TOB Financing   $ 9,006,899               $ 9,006,899 $ 9,007,656              
Debt Instrument, Total Rate of Borrowing   4.01%               4.01% 4.05%              
TOB Facility-12 [Member] [Member] | Trading Securities [Member]                                    
Available-for-sale Security, Maturity Date at a point in time           Jul. 01, 2015       Jul. 01, 2017 Jul. 01, 2017              
TOB Financing   $ 17,246,899       $ 17,300,000       $ 17,246,899 $ 17,245,083              
Debt Instrument, Total Rate of Borrowing   4.51%               4.51% 4.55%              
TOB facility-3 [Member] | Trading Securities [Member] | Mortgage Backed Security Trust 3 [Member]                                    
Debt financing                                 $ 2,900,000  
Available-for-sale Security, Maturity Date at a point in time                   Apr. 01, 2016 Apr. 01, 2015              
TOB Financing   $ 5,270,000               $ 5,270,000 $ 5,270,000              
Debt Instrument, Total Rate of Borrowing   1.10%               1.10% 1.06%              
TOB Facility-1 [Member] | Trading Securities [Member]                                    
Debt financing               $ 9,800,000                    
TEBS III Facility [Member]                                    
Debt financing   $ 84,300,000               $ 84,300,000                
Number of Available for Sale Securities, Held in a Trust | Integer                         9          
Available-for-sale Securities, Fair Value Disclosure Held in Trust                         $ 105,400,000          
Debt Financing, Net                   82,200,000                
Payments to Acquire Available-for-sale Securities                   37,500,000                
Restricted Cash and Cash Equivalents   4,800,000               4,800,000                
TEBS III Facility [Member] | Series B [Member]                                    
Available-for-sale Securities, Fair Value Disclosure Held in Trust   21,100,000               21,100,000                
TEBS II Facility [Member]                                    
Debt financing   94,700,000               94,700,000 $ 94,700,000              
Number of Available for Sale Securities, Held in a Trust | Integer                             13      
Available-for-sale Securities, Fair Value Disclosure Held in Trust                             $ 118,400,000      
Debt Financing, Net                   91,600,000                
Payments to Acquire Available-for-sale Securities                   72,400,000                
Restricted Cash and Cash Equivalents   163,000               163,000 6,300,000              
Escrow Deposit   6,300,000               6,300,000                
TEBS II Facility [Member] | Series B [Member]                                    
Available-for-sale Securities, Fair Value Disclosure Held in Trust   23,700,000               23,700,000                
TEB Facility [Member]                                    
Restricted Cash and Cash Equivalents   365,000               365,000 $ 1,000,000              
TOB Facility [Member]                                    
Debt financing   $ 137,200,000               $ 137,200,000       $ 124,700,000        
Number of Available for Sale Securities, Held in a Trust | Integer                         8          
TOB Facility [Member] | Effective rate - minimum [Member]                                    
Effective rate   2.80%               2.80%                
TOB Facility [Member] | Effective rate - maximum [Member]                                    
Effective rate   4.50%               4.50%                
SPEARS [Member] | TOB Facility [Member]                                    
Proceeds from Sale of Available-for-sale Securities             45,900,000                      
SPEARS [Member] | Trust Portfolio--MBS Bonds [Member]                                    
TOB Financing   $ 34,900,000               $ 34,900,000                
SPEARS [Member] | Public housing capital fund trusts [Member]                                    
TOB Financing                                   49,000,000
LIFERS [Member] | TOB Facility [Member]                                    
Proceeds from Sale of Available-for-sale Securities             $ 26,500,000                      
LIFERS [Member] | Trust Portfolio--MBS Bonds [Member]                                    
Available for Sale Securities, not Including Premiums   $ 9,200,000               $ 9,200,000                
LIFERS [Member] | Public housing capital fund trusts [Member]                                    
TOB Financing                                   $ 16,000,000