SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item loan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Carrying amount of mortgages	$ 68,079	$ 83,248	$ 81,056	$ 75,740
SBA 7(a) Loans
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	175
Carrying amount of mortgages	$ 68,079
Principal amount of loans subject to deliquent principal or interest	364
Loans not secured by real estate	242
Federal income tax cost basis of mortgage loans (unaudited)	54,925
SBA 7(a) Loans | Government guaranteed portions
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Carrying amount of mortgages	1,601
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | SBA 7(a) loans receivable, subject to secured borrowings
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Carrying amount of mortgages	12,152
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | General reserves
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Principal amount of loans subject to deliquent principal or interest	0
Reserves	$ 450
SBA 7(a) Loans | Indiana
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	17
Carrying amount of mortgages	$ 8,620
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Indiana | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 110
Interest Rate	6.50%
SBA 7(a) Loans | Indiana | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 1,000
Interest Rate	7.75%
SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	25
Size of loans	$ 0
Carrying amount of mortgages	8,086
Principal amount of loans subject to deliquent principal or interest	$ 0
SBA 7(a) Loans | Texas | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Interest Rate	5.88%
SBA 7(a) Loans | Texas | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 1,020
Interest Rate	7.75%
SBA 7(a) Loans | Ohio
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	24
Carrying amount of mortgages	$ 7,000
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Ohio | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 0
Interest Rate	6.75%
SBA 7(a) Loans | Ohio | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 800
Interest Rate	7.75%
SBA 7(a) Loans | Michigan
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	17
Carrying amount of mortgages	$ 5,138
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Michigan | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 10
Interest Rate	6.25%
SBA 7(a) Loans | Michigan | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 1,000
Interest Rate	7.75%
SBA 7(a) Loans | Florida
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	10
Carrying amount of mortgages	$ 4,007
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Florida | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 80
Interest Rate	6.75%
SBA 7(a) Loans | Florida | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 1,110
Interest Rate	7.75%
SBA 7(a) Loans | Pennsylvania
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	5
Carrying amount of mortgages	$ 2,388
Principal amount of loans subject to deliquent principal or interest	284
SBA 7(a) Loans | Pennsylvania | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 170
Interest Rate	6.75%
SBA 7(a) Loans | Pennsylvania | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 760
Interest Rate	7.75%
SBA 7(a) Loans | Illinois
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	7
Carrying amount of mortgages	$ 1,779
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Illinois | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 50
Interest Rate	6.75%
SBA 7(a) Loans | Illinois | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 550
Interest Rate	7.75%
SBA 7(a) Loans | Louisiana
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	4
Carrying amount of mortgages	$ 1,551
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Louisiana | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 110
Interest Rate	6.75%
SBA 7(a) Loans | Louisiana | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 610
Interest Rate	7.75%
SBA 7(a) Loans | South Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	4
Carrying amount of mortgages	$ 1,358
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | South Carolina | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 280
Interest Rate	6.75%
SBA 7(a) Loans | South Carolina | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 400
Interest Rate	7.75%
SBA 7(a) Loans | Wisconsin
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	7
Carrying amount of mortgages	$ 1,355
Principal amount of loans subject to deliquent principal or interest	80
SBA 7(a) Loans | Wisconsin | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 0
Interest Rate	6.75%
SBA 7(a) Loans | Wisconsin | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 530
Interest Rate	8.25%
SBA 7(a) Loans | North Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	4
Carrying amount of mortgages	$ 1,319
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | North Carolina | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 70
Interest Rate	6.75%
SBA 7(a) Loans | North Carolina | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 630
Interest Rate	7.75%
SBA 7(a) Loans | Colorado
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	4
Carrying amount of mortgages	$ 1,309
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Colorado | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 60
Interest Rate	6.50%
SBA 7(a) Loans | Colorado | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 540
Interest Rate	7.75%
SBA 7(a) Loans | Virginia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	4
Carrying amount of mortgages	$ 1,283
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Virginia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 240
Interest Rate	7.00%
SBA 7(a) Loans | Virginia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 470
Interest Rate	7.75%
SBA 7(a) Loans | Mississippi
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	4
Carrying amount of mortgages	$ 1,206
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Mississippi | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 150
Interest Rate	7.00%
SBA 7(a) Loans | Mississippi | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 520
Interest Rate	7.75%
SBA 7(a) Loans | Alabama
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	5
Carrying amount of mortgages	$ 1,130
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Alabama | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 30
Interest Rate	6.75%
SBA 7(a) Loans | Alabama | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 490
Interest Rate	7.75%
SBA 7(a) Loans | Kentucky
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	5
Carrying amount of mortgages	$ 1,099
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Kentucky | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 100
Interest Rate	7.00%
SBA 7(a) Loans | Kentucky | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 430
Interest Rate	7.75%
SBA 7(a) Loans | Other
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | loan	29
Carrying amount of mortgages	$ 6,148
Principal amount of loans subject to deliquent principal or interest	0
SBA 7(a) Loans | Other | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 10
Interest Rate	6.25%
SBA 7(a) Loans | Other | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 550
Interest Rate	7.75%
Mortgage Loans - $284,000 | SBA 7(a) Loans | Pennsylvania
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 284
Interest Rate	7.75%
Reserves	$ 116
Mortgage Loans - $80,000 | SBA 7(a) Loans | Wisconsin
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 80
Interest Rate	8.25%
Reserves	$ 32