SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) item
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	181
Carrying amount of mortgages	$ 75,740
Principal amount of loans subject to deliquent principal or interest	$ 755
SBA 7(a) Loans
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	178
Carrying amount of mortgages	$ 73,147
Principal amount of loans subject to deliquent principal or interest	755
Loans not secured by real estate	151
Loans with subordinate lien positions	241
Federal income tax cost basis of mortgage loans (unaudited)	46,817
SBA 7(a) Loans | Government guaranteed portions
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Carrying amount of mortgages	4,868
SBA 7(a) Loans | SBA 7(a) loans, subject to secured borrowings
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Carrying amount of mortgages	27,899
SBA 7(a) Loans | General reserves
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Reserves	$ (223)
SBA 7(a) Loans | Michigan
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	23
Interest rate (minimum)	5.25%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 6,354
SBA 7(a) Loans | Michigan | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	10
SBA 7(a) Loans | Michigan | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 870
SBA 7(a) Loans | Ohio
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	21
Interest rate (minimum)	5.25%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 5,801
SBA 7(a) Loans | Ohio | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 950
SBA 7(a) Loans | Indiana
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	16
Interest rate (minimum)	5.00%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 4,707
SBA 7(a) Loans | Indiana | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	40
SBA 7(a) Loans | Indiana | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 1,040
SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	28
Interest rate (minimum)	4.38%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 4,090
Principal amount of loans subject to deliquent principal or interest	506
SBA 7(a) Loans | Texas | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 650
SBA 7(a) Loans | Virginia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	8
Interest rate (minimum)	5.75%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 2,751
SBA 7(a) Loans | Virginia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	160
SBA 7(a) Loans | Virginia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 660
SBA 7(a) Loans | Kentucky
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	7
Interest rate (minimum)	5.50%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 1,644
SBA 7(a) Loans | Kentucky | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	110
SBA 7(a) Loans | Kentucky | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 410
SBA 7(a) Loans | Florida
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	8
Interest rate (minimum)	5.50%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 1,545
SBA 7(a) Loans | Florida | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	10
SBA 7(a) Loans | Florida | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 360
SBA 7(a) Loans | Alabama
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	6
Interest rate (minimum)	5.25%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 1,402
SBA 7(a) Loans | Alabama | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	40
SBA 7(a) Loans | Alabama | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 460
SBA 7(a) Loans | Illinois
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	4
Interest rate (minimum)	5.75%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 1,358
SBA 7(a) Loans | Illinois | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	60
SBA 7(a) Loans | Illinois | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 790
SBA 7(a) Loans | Missouri
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	5
Interest rate (minimum)	5.50%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 1,309
SBA 7(a) Loans | Missouri | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	50
SBA 7(a) Loans | Missouri | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 440
SBA 7(a) Loans | Wisconsin
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	7
Interest rate (minimum)	5.25%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 1,135
Principal amount of loans subject to deliquent principal or interest	249
SBA 7(a) Loans | Wisconsin | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	10
SBA 7(a) Loans | Wisconsin | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 250
SBA 7(a) Loans | Arizona
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	5
Interest rate (minimum)	6.00%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 993
SBA 7(a) Loans | Arizona | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	30
SBA 7(a) Loans | Arizona | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 440
SBA 7(a) Loans | South Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	6
Interest rate (minimum)	5.50%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 955
SBA 7(a) Loans | South Carolina | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	0
SBA 7(a) Loans | South Carolina | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 380
SBA 7(a) Loans | North Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	3
Interest rate (minimum)	6.00%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 909
SBA 7(a) Loans | North Carolina | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	90
SBA 7(a) Loans | North Carolina | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 660
SBA 7(a) Loans | Georgia
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	5
Interest rate (minimum)	5.75%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 834
SBA 7(a) Loans | Georgia | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	100
SBA 7(a) Loans | Georgia | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 230
SBA 7(a) Loans | Colorado
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	5
Interest rate (minimum)	5.00%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 833
SBA 7(a) Loans | Colorado | Minimum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	0
SBA 7(a) Loans | Colorado | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 380
SBA 7(a) Loans | Other
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	21
Interest rate (minimum)	5.17%
Interest rate (maximum)	6.25%
Carrying amount of mortgages	$ 3,983
SBA 7(a) Loans | Other | Maximum
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 480
Conventional Loans
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	3
Carrying amount of mortgages	$ 2,593
Conventional Loans | Ohio
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	1
Interest rate	10.85%
Carrying amount of mortgages	$ 926
Conventional Loans | Arizona
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	1
Interest rate	6.85%
Carrying amount of mortgages	$ 1,237
Conventional Loans | North Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Number of loans | item	1
Interest rate	7.50%
Carrying amount of mortgages	$ 430
Mortgage Loans - $11,000 | SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 11
Interest rate	6.00%
Mortgage Loans - $33,000 | SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 33
Interest rate	6.00%
Mortgage Loans - $608,000 | SBA 7(a) Loans | Texas
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 598
Interest rate	6.25%
Reserves	$ (16)
Mortgage Loans - $431,000 | SBA 7(a) Loans | Wisconsin
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 431
Interest rate	6.25%
Reserves	$ (32)
Mortgage Loans - $443,000 | Conventional Loans | North Carolina
SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE
Size of loans	$ 443
Interest rate	7.50%