SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 item
Conventional Loans
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	114
Carrying Amount of Mortgages	$ 108,862,000
Carrying amount of mortgages with a fixed rate of interest	25,384,000
Federal income tax cost basis of mortgage loans	131,266,000
Conventional Loans | Loans secured by second liens
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	2
Conventional Loans | Michigan
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	6
Interest Rate (Minimum)	3.11%
Interest Rate (Maximum)	7.25%
Carrying Amount of Mortgages	7,244,000
Conventional Loans | Michigan | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	600,000
Conventional Loans | Michigan | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	2,900,000
Conventional Loans | Ohio
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	3.23%
Interest Rate (Maximum)	10.23%
Carrying Amount of Mortgages	6,310,000
Conventional Loans | Ohio | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	600,000
Conventional Loans | Ohio | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,800,000
Conventional Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	22
Interest Rate (Minimum)	2.98%
Interest Rate (Maximum)	10.78%
Carrying Amount of Mortgages	15,188,000
Conventional Loans | Texas | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	2,000,000
Conventional Loans | Virginia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	8
Interest Rate (Minimum)	3.23%
Interest Rate (Maximum)	7.50%
Carrying Amount of Mortgages	13,266,000
Conventional Loans | Virginia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	500,000
Conventional Loans | Virginia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	3,900,000
Conventional Loans | Florida
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	4
Interest Rate (Minimum)	3.36%
Interest Rate (Maximum)	7.50%
Carrying Amount of Mortgages	4,040,000
Conventional Loans | Florida | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	100,000
Conventional Loans | Florida | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,800,000
Conventional Loans | Indiana
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	4.23%
Interest Rate (Maximum)	8.25%
Carrying Amount of Mortgages	5,382,000
Conventional Loans | Indiana | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	300,000
Conventional Loans | Indiana | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	2,100,000
Conventional Loans | Missouri
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	4
Interest Rate (Minimum)	4.23%
Interest Rate (Maximum)	8.25%
Carrying Amount of Mortgages	2,579,000
Conventional Loans | Missouri | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	200,000
Conventional Loans | Missouri | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,100,000
Conventional Loans | North Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	10
Interest Rate (Minimum)	3.73%
Interest Rate (Maximum)	9.85%
Carrying Amount of Mortgages	7,119,000
Conventional Loans | North Carolina | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	300,000
Conventional Loans | North Carolina | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,400,000
Conventional Loans | Arizona
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	7
Interest Rate (Minimum)	3.23%
Interest Rate (Maximum)	9.40%
Carrying Amount of Mortgages	9,848,000
Conventional Loans | Arizona | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	200,000
Conventional Loans | Arizona | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	3,100,000
Conventional Loans | Iowa
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	3
Interest Rate (Minimum)	4.23%
Interest Rate (Maximum)	6.95%
Carrying Amount of Mortgages	2,798,000
Conventional Loans | Iowa | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	300,000
Conventional Loans | Iowa | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,500,000
Conventional Loans | Alabama
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	6
Interest Rate (Minimum)	3.75%
Interest Rate (Maximum)	9.50%
Carrying Amount of Mortgages	5,620,000
Conventional Loans | Alabama | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	200,000
Conventional Loans | Alabama | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,900,000
Conventional Loans | Oregon
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	4.48%
Interest Rate (Maximum)	9.90%
Carrying Amount of Mortgages	5,490,000
Conventional Loans | Oregon | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	100,000
Conventional Loans | Oregon | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	2,700,000
Conventional Loans | Pennsylvania
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	3
Interest Rate (Minimum)	4.23%
Interest Rate (Maximum)	10.25%
Carrying Amount of Mortgages	5,254,000
Conventional Loans | Pennsylvania | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	600,000
Conventional Loans | Pennsylvania | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	2,900,000
Conventional Loans | Georgia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	6
Interest Rate (Minimum)	3.73%
Interest Rate (Maximum)	10.25%
Carrying Amount of Mortgages	3,408,000
Conventional Loans | Georgia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	100,000
Conventional Loans | Georgia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,200,000
Conventional Loans | California
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	4
Interest Rate (Minimum)	3.98%
Interest Rate (Maximum)	9.00%
Carrying Amount of Mortgages	3,173,000
Conventional Loans | California | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	100,000
Conventional Loans | California | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	1,400,000
Conventional Loans | Other
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	16
Interest Rate (Minimum)	2.73%
Interest Rate (Maximum)	9.78%
Carrying Amount of Mortgages	12,143,000
Conventional Loans | Other | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	100,000
Conventional Loans | Other | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	2,000,000
SBA 7(a) Loans
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	182
Carrying Amount of Mortgages	80,303,000
Federal income tax cost basis of mortgage loans	39,445,000
Loans not secured by real estate	224,000
Reserve	113,000
Loans with subordinate lien positions	242,000
SBA 7(a) Loans | Michigan
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	22
Interest Rate (Minimum)	5.25%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	6,167,000
SBA 7(a) Loans | Michigan | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	10,000
SBA 7(a) Loans | Michigan | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	890,000
SBA 7(a) Loans | Ohio
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	22
Interest Rate (Minimum)	5.00%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	5,873,000
SBA 7(a) Loans | Ohio | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	10,000
SBA 7(a) Loans | Ohio | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	710,000
SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	28
Interest Rate (Minimum)	4.13%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	3,325,000
SBA 7(a) Loans | Texas | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	680,000
SBA 7(a) Loans | Virginia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	10
Interest Rate	6.00%
Carrying Amount of Mortgages	3,058,000
SBA 7(a) Loans | Virginia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	150,000
SBA 7(a) Loans | Virginia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	740,000
SBA 7(a) Loans | Florida
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	10
Interest Rate (Minimum)	5.25%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	2,554,000
SBA 7(a) Loans | Florida | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	10,000
SBA 7(a) Loans | Florida | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	650,000
SBA 7(a) Loans | Kentucky
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	6
Interest Rate	6.00%
Carrying Amount of Mortgages	1,688,000
SBA 7(a) Loans | Kentucky | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	110,000
SBA 7(a) Loans | Kentucky | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	530,000
SBA 7(a) Loans | Indiana
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	9
Interest Rate (Minimum)	4.75%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	1,508,000
SBA 7(a) Loans | Indiana | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	370,000
SBA 7(a) Loans | Wisconsin
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	7
Interest Rate (Minimum)	5.00%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	1,401,000
SBA 7(a) Loans | Wisconsin | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	10,000
SBA 7(a) Loans | Wisconsin | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	380,000
SBA 7(a) Loans | Illinois
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	5.75%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	1,316,000
SBA 7(a) Loans | Illinois | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	70,000
SBA 7(a) Loans | Illinois | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	380,000
SBA 7(a) Loans | Missouri
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	6
Interest Rate (Minimum)	5.25%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	1,194,000
SBA 7(a) Loans | Missouri | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	460,000
SBA 7(a) Loans | North Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	5.75%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	1,193,000
SBA 7(a) Loans | North Carolina | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	100,000
SBA 7(a) Loans | North Carolina | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	330,000
SBA 7(a) Loans | Arizona
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	5.75%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	945,000
SBA 7(a) Loans | Arizona | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	30,000
SBA 7(a) Loans | Arizona | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	470,000
SBA 7(a) Loans | Iowa
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	4
Interest Rate (Minimum)	4.92%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	941,000
SBA 7(a) Loans | Iowa | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	130,000
SBA 7(a) Loans | Iowa | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	500,000
SBA 7(a) Loans | Alabama
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	4
Interest Rate (Minimum)	5.00%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	903,000
SBA 7(a) Loans | Alabama | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	50,000
SBA 7(a) Loans | Alabama | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	490,000
SBA 7(a) Loans | Tennessee
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	2
Interest Rate (Minimum)	5.50%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	811,000
SBA 7(a) Loans | Tennessee | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	330,000
SBA 7(a) Loans | Tennessee | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	490,000
SBA 7(a) Loans | Georgia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	5
Interest Rate (Minimum)	5.13%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	769,000
SBA 7(a) Loans | Georgia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	60,000
SBA 7(a) Loans | Georgia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	260,000
SBA 7(a) Loans | Other
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of Loans	32
Interest Rate (Minimum)	4.75%
Interest Rate (Maximum)	6.00%
Carrying Amount of Mortgages	4,299,000
SBA 7(a) Loans | Other | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	570,000
Mortgage Loans - $48,000 | SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	48,000
Interest Rate	6.00%
Mortgage Loans - $68,000 | SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	68,000
Interest Rate	6.00%
Mortgage Loans - $466,000 | SBA 7(a) Loans | Other
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	466,000
Reserve	26,000
Mortgage Loans - $334,000 | SBA 7(a) Loans | Other
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of Loans	$ 334,000
Interest Rate	5.00%