Schedule IV - Schedule of Mortgage Loans on Real Estate (Details) - Single family residential - First mortgage $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) loan
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	111
Carrying amount of mortgages	$ 11,477
Principal amount of loans subject to delinquent principal or interest	26,970
Aggregate cost for federal income tax purposes	$ 23,100
$0-49,999
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	6
Carrying amount of mortgages	$ 162
Principal amount of loans subject to delinquent principal or interest	$ 98
$0-49,999 \| Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
$0-49,999 \| Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	8.00%
$50,000-99,999
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	12
Carrying amount of mortgages	$ 444
Principal amount of loans subject to delinquent principal or interest	$ 449
$50,000-99,999 \| Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
$50,000-99,999 \| Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.50%
$100,000-149,999
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	21
Carrying amount of mortgages	$ 1,099
Principal amount of loans subject to delinquent principal or interest	$ 2,412
$100,000-149,999 \| Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
$100,000-149,999 \| Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	8.50%
$150,000-199,999
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	13
Carrying amount of mortgages	$ 745
Principal amount of loans subject to delinquent principal or interest	$ 1,933
$150,000-199,999 \| Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.40%
$150,000-199,999 \| Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	8.00%
$200,000-249,999
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	15
Carrying amount of mortgages	$ 712
Principal amount of loans subject to delinquent principal or interest	$ 3,067
$200,000-249,999 \| Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.625%
$200,000-249,999 \| Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	8.25%
$250,000 plus
Mortgage Loans on Real Estate [Line Items]
Loan Count \| loan	44
Carrying amount of mortgages	$ 8,315
Principal amount of loans subject to delinquent principal or interest	$ 19,011
$250,000 plus \| Minimum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
$250,000 plus \| Maximum
Mortgage Loans on Real Estate [Line Items]
Interest Rate	8.25%

The carrying amount of the outstanding balance due under the mortgage loan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

Amount of the federal income tax basis of mortgage loans on real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.8)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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+ References

No definition available.

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- Definition

Indicates the number of mortgages under each classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.3)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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- Definition

Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.10(a))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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